WebSVN – Kolibri OS – Diff – /drivers/video/drm/i915/intel_dp.c


/*
 * Copyright © 2008 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Keith Packard 
 *
 */
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "intel_drv.h"
#include 
#include "i915_drv.h"
 
#define DP_LINK_CHECK_TIMEOUT	(10 * 1000)
 
struct dp_link_dpll {
	int link_bw;
	struct dpll dpll;
};
 
static const struct dp_link_dpll gen4_dpll[] = {
	{ DP_LINK_BW_1_62,
		{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
	{ DP_LINK_BW_2_7,
		{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
};
 
static const struct dp_link_dpll pch_dpll[] = {
	{ DP_LINK_BW_1_62,
		{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
	{ DP_LINK_BW_2_7,
		{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
};
 
static const struct dp_link_dpll vlv_dpll[] = {
	{ DP_LINK_BW_1_62,
		{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
	{ DP_LINK_BW_2_7,
		{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
};
 
/*
 * CHV supports eDP 1.4 that have  more link rates.
 * Below only provides the fixed rate but exclude variable rate.
 */
static const struct dp_link_dpll chv_dpll[] = {
	/*
	 * CHV requires to program fractional division for m2.
	 * m2 is stored in fixed point format using formula below
	 * (m2_int << 22) | m2_fraction
	 */
	{ DP_LINK_BW_1_62,	/* m2_int = 32, m2_fraction = 1677722 */
		{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
	{ DP_LINK_BW_2_7,	/* m2_int = 27, m2_fraction = 0 */
		{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
	{ DP_LINK_BW_5_4,	/* m2_int = 27, m2_fraction = 0 */
		{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
};
 
/**
 * is_edp - is the given port attached to an eDP panel (either CPU or PCH)
 * @intel_dp: DP struct
 *
 * If a CPU or PCH DP output is attached to an eDP panel, this function
 * will return true, and false otherwise.
 */
static bool is_edp(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 
	return intel_dig_port->base.type == INTEL_OUTPUT_EDP;
}
 
static struct drm_device *intel_dp_to_dev(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 
	return intel_dig_port->base.base.dev;
}
 
static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
{
	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
}
 
static void intel_dp_link_down(struct intel_dp *intel_dp);
static bool _edp_panel_vdd_on(struct intel_dp *intel_dp);
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
 
int
intel_dp_max_link_bw(struct intel_dp *intel_dp)
{
	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
	struct drm_device *dev = intel_dp->attached_connector->base.dev;
 
	switch (max_link_bw) {
	case DP_LINK_BW_1_62:
	case DP_LINK_BW_2_7:
		break;
	case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */
		if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) ||
		     INTEL_INFO(dev)->gen >= 8) &&
		    intel_dp->dpcd[DP_DPCD_REV] >= 0x12)
			max_link_bw = DP_LINK_BW_5_4;
		else
			max_link_bw = DP_LINK_BW_2_7;
		break;
	default:
		WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n",
		     max_link_bw);
		max_link_bw = DP_LINK_BW_1_62;
		break;
	}
	return max_link_bw;
}
 
static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	u8 source_max, sink_max;
 
	source_max = 4;
	if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&
	    (intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)
		source_max = 2;
 
	sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
 
	return min(source_max, sink_max);
}
 
/*
 * The units on the numbers in the next two are... bizarre.  Examples will
 * make it clearer; this one parallels an example in the eDP spec.
 *
 * intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:
 *
 *     270000 * 1 * 8 / 10 == 216000
 *
 * The actual data capacity of that configuration is 2.16Gbit/s, so the
 * units are decakilobits.  ->clock in a drm_display_mode is in kilohertz -
 * or equivalently, kilopixels per second - so for 1680x1050R it'd be
 * 119000.  At 18bpp that's 2142000 kilobits per second.
 *
 * Thus the strange-looking division by 10 in intel_dp_link_required, to
 * get the result in decakilobits instead of kilobits.
 */
 
static int
intel_dp_link_required(int pixel_clock, int bpp)
{
	return (pixel_clock * bpp + 9) / 10;
}
 
static int
intel_dp_max_data_rate(int max_link_clock, int max_lanes)
{
	return (max_link_clock * max_lanes * 8) / 10;
}
 
static enum drm_mode_status
intel_dp_mode_valid(struct drm_connector *connector,
		    struct drm_display_mode *mode)
{
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_connector *intel_connector = to_intel_connector(connector);
	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
	int target_clock = mode->clock;
	int max_rate, mode_rate, max_lanes, max_link_clock;
 
	if (is_edp(intel_dp) && fixed_mode) {
		if (mode->hdisplay > fixed_mode->hdisplay)
			return MODE_PANEL;
 
		if (mode->vdisplay > fixed_mode->vdisplay)
			return MODE_PANEL;
 
		target_clock = fixed_mode->clock;
	}
 
	max_link_clock = drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
	max_lanes = intel_dp_max_lane_count(intel_dp);
 
	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
	mode_rate = intel_dp_link_required(target_clock, 18);
 
	if (mode_rate > max_rate)
		return MODE_CLOCK_HIGH;
 
	if (mode->clock < 10000)
		return MODE_CLOCK_LOW;
 
	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
		return MODE_H_ILLEGAL;
 
	return MODE_OK;
}
 
static uint32_t
pack_aux(uint8_t *src, int src_bytes)
{
	int	i;
	uint32_t v = 0;
 
	if (src_bytes > 4)
		src_bytes = 4;
	for (i = 0; i < src_bytes; i++)
		v |= ((uint32_t) src[i]) << ((3-i) * 8);
	return v;
}
 
static void
unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
{
	int i;
	if (dst_bytes > 4)
		dst_bytes = 4;
	for (i = 0; i < dst_bytes; i++)
		dst[i] = src >> ((3-i) * 8);
}
 
/* hrawclock is 1/4 the FSB frequency */
static int
intel_hrawclk(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t clkcfg;
 
	/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */
	if (IS_VALLEYVIEW(dev))
		return 200;
 
	clkcfg = I915_READ(CLKCFG);
	switch (clkcfg & CLKCFG_FSB_MASK) {
	case CLKCFG_FSB_400:
		return 100;
	case CLKCFG_FSB_533:
		return 133;
	case CLKCFG_FSB_667:
		return 166;
	case CLKCFG_FSB_800:
		return 200;
	case CLKCFG_FSB_1067:
		return 266;
	case CLKCFG_FSB_1333:
		return 333;
	/* these two are just a guess; one of them might be right */
	case CLKCFG_FSB_1600:
	case CLKCFG_FSB_1600_ALT:
		return 400;
	default:
		return 133;
	}
}
 
static void
intel_dp_init_panel_power_sequencer(struct drm_device *dev,
				    struct intel_dp *intel_dp,
				    struct edp_power_seq *out);
static void
intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
					      struct intel_dp *intel_dp,
					      struct edp_power_seq *out);
 
static enum pipe
vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = intel_dig_port->port;
	enum pipe pipe;
 
	/* modeset should have pipe */
	if (crtc)
		return to_intel_crtc(crtc)->pipe;
 
	/* init time, try to find a pipe with this port selected */
	for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
		u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) &
			PANEL_PORT_SELECT_MASK;
		if (port_sel == PANEL_PORT_SELECT_DPB_VLV && port == PORT_B)
			return pipe;
		if (port_sel == PANEL_PORT_SELECT_DPC_VLV && port == PORT_C)
			return pipe;
	}
 
	/* shrug */
	return PIPE_A;
}
 
static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
	if (HAS_PCH_SPLIT(dev))
		return PCH_PP_CONTROL;
	else
		return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp));
}
 
static u32 _pp_stat_reg(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
	if (HAS_PCH_SPLIT(dev))
		return PCH_PP_STATUS;
	else
		return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));
}
 
 
static bool edp_have_panel_power(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;
}
 
static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	enum intel_display_power_domain power_domain;
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	return intel_display_power_enabled(dev_priv, power_domain) &&
	       (I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD) != 0;
}
 
static void
intel_dp_check_edp(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	if (!is_edp(intel_dp))
		return;
 
	if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
		WARN(1, "eDP powered off while attempting aux channel communication.\n");
		DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",
			      I915_READ(_pp_stat_reg(intel_dp)),
			      I915_READ(_pp_ctrl_reg(intel_dp)));
	}
}
 
static uint32_t
intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
	uint32_t status;
	bool done;
 
#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
	if (has_aux_irq)
		done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
					  msecs_to_jiffies_timeout(10));
	else
		done = wait_for_atomic(C, 10) == 0;
	if (!done)
		DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",
			  has_aux_irq);
#undef C
 
	return status;
}
 
static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
 
	/*
	 * The clock divider is based off the hrawclk, and would like to run at
	 * 2MHz.  So, take the hrawclk value and divide by 2 and use that
	 */
	return index ? 0 : intel_hrawclk(dev) / 2;
}
 
static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
 
	if (index)
		return 0;
 
	if (intel_dig_port->port == PORT_A) {
		if (IS_GEN6(dev) || IS_GEN7(dev))
			return 200; /* SNB & IVB eDP input clock at 400Mhz */
		else
			return 225; /* eDP input clock at 450Mhz */
	} else {
		return DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
	}
}
 
static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	if (intel_dig_port->port == PORT_A) {
		if (index)
			return 0;
		return DIV_ROUND_CLOSEST(intel_ddi_get_cdclk_freq(dev_priv), 2000);
	} else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
		/* Workaround for non-ULT HSW */
		switch (index) {
		case 0: return 63;
		case 1: return 72;
		default: return 0;
		}
	} else  {
		return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
	}
}
 
static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
	return index ? 0 : 100;
}
 
static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp,
				      bool has_aux_irq,
				      int send_bytes,
				      uint32_t aux_clock_divider)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	uint32_t precharge, timeout;
 
	if (IS_GEN6(dev))
		precharge = 3;
	else
		precharge = 5;
 
	if (IS_BROADWELL(dev) && intel_dp->aux_ch_ctl_reg == DPA_AUX_CH_CTL)
		timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
	else
		timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
 
	return DP_AUX_CH_CTL_SEND_BUSY |
	       DP_AUX_CH_CTL_DONE |
	       (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) |
	       DP_AUX_CH_CTL_TIME_OUT_ERROR |
	       timeout |
	       DP_AUX_CH_CTL_RECEIVE_ERROR |
	       (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
	       (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
	       (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);
}
 
static int
intel_dp_aux_ch(struct intel_dp *intel_dp,
		uint8_t *send, int send_bytes,
		uint8_t *recv, int recv_size)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
	uint32_t ch_data = ch_ctl + 4;
	uint32_t aux_clock_divider;
	int i, ret, recv_bytes;
	uint32_t status;
	int try, clock = 0;
	bool has_aux_irq = HAS_AUX_IRQ(dev);
	bool vdd;
 
	vdd = _edp_panel_vdd_on(intel_dp);
 
	/* dp aux is extremely sensitive to irq latency, hence request the
	 * lowest possible wakeup latency and so prevent the cpu from going into
	 * deep sleep states.
	 */
 
	intel_dp_check_edp(intel_dp);
 
	intel_aux_display_runtime_get(dev_priv);
 
	/* Try to wait for any previous AUX channel activity */
	for (try = 0; try < 3; try++) {
		status = I915_READ_NOTRACE(ch_ctl);
		if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
			break;
		msleep(1);
	}
 
	if (try == 3) {
		WARN(1, "dp_aux_ch not started status 0x%08x\n",
		     I915_READ(ch_ctl));
		ret = -EBUSY;
		goto out;
	}
 
	/* Only 5 data registers! */
	if (WARN_ON(send_bytes > 20 || recv_size > 20)) {
		ret = -E2BIG;
		goto out;
	}
 
	while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
		u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
							  has_aux_irq,
							  send_bytes,
							  aux_clock_divider);
 
	/* Must try at least 3 times according to DP spec */
	for (try = 0; try < 5; try++) {
		/* Load the send data into the aux channel data registers */
		for (i = 0; i < send_bytes; i += 4)
			I915_WRITE(ch_data + i,
				   pack_aux(send + i, send_bytes - i));
 
		/* Send the command and wait for it to complete */
			I915_WRITE(ch_ctl, send_ctl);
 
		status = intel_dp_aux_wait_done(intel_dp, has_aux_irq);
 
		/* Clear done status and any errors */
		I915_WRITE(ch_ctl,
			   status |
			   DP_AUX_CH_CTL_DONE |
			   DP_AUX_CH_CTL_TIME_OUT_ERROR |
			   DP_AUX_CH_CTL_RECEIVE_ERROR);
 
		if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR |
			      DP_AUX_CH_CTL_RECEIVE_ERROR))
			continue;
		if (status & DP_AUX_CH_CTL_DONE)
			break;
	}
		if (status & DP_AUX_CH_CTL_DONE)
			break;
	}
 
	if ((status & DP_AUX_CH_CTL_DONE) == 0) {
		DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
		ret = -EBUSY;
		goto out;
	}
 
	/* Check for timeout or receive error.
	 * Timeouts occur when the sink is not connected
	 */
	if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
		DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
		ret = -EIO;
		goto out;
	}
 
	/* Timeouts occur when the device isn't connected, so they're
	 * "normal" -- don't fill the kernel log with these */
	if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
		DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
		ret = -ETIMEDOUT;
		goto out;
	}
 
	/* Unload any bytes sent back from the other side */
	recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
		      DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
	if (recv_bytes > recv_size)
		recv_bytes = recv_size;
 
	for (i = 0; i < recv_bytes; i += 4)
		unpack_aux(I915_READ(ch_data + i),
			   recv + i, recv_bytes - i);
 
	ret = recv_bytes;
out:
//	pm_qos_update_request(&dev_priv->pm_qos, PM_QOS_DEFAULT_VALUE);
	intel_aux_display_runtime_put(dev_priv);
 
	if (vdd)
		edp_panel_vdd_off(intel_dp, false);
 
	return ret;
}
 
#define BARE_ADDRESS_SIZE	3
#define HEADER_SIZE		(BARE_ADDRESS_SIZE + 1)
static ssize_t
intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
{
	struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux);
	uint8_t txbuf[20], rxbuf[20];
	size_t txsize, rxsize;
	int ret;
 
	txbuf[0] = msg->request << 4;
	txbuf[1] = msg->address >> 8;
	txbuf[2] = msg->address & 0xff;
	txbuf[3] = msg->size - 1;
 
	switch (msg->request & ~DP_AUX_I2C_MOT) {
	case DP_AUX_NATIVE_WRITE:
	case DP_AUX_I2C_WRITE:
		txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
		rxsize = 1;
 
		if (WARN_ON(txsize > 20))
		return -E2BIG;
 
		memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
 
		ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
		if (ret > 0) {
			msg->reply = rxbuf[0] >> 4;
 
			/* Return payload size. */
			ret = msg->size;
		}
			break;
 
	case DP_AUX_NATIVE_READ:
	case DP_AUX_I2C_READ:
		txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
		rxsize = msg->size + 1;
 
		if (WARN_ON(rxsize > 20))
		return -E2BIG;
 
		ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
		if (ret > 0) {
			msg->reply = rxbuf[0] >> 4;
			/*
			 * Assume happy day, and copy the data. The caller is
			 * expected to check msg->reply before touching it.
			 *
			 * Return payload size.
			 */
			ret--;
			memcpy(msg->buffer, rxbuf + 1, ret);
		}
		break;
 
	default:
		ret = -EINVAL;
		break;
	}
 
			return ret;
}
 
static void
intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	enum port port = intel_dig_port->port;
	const char *name = NULL;
	int ret;
 
	switch (port) {
	case PORT_A:
		intel_dp->aux_ch_ctl_reg = DPA_AUX_CH_CTL;
		name = "DPDDC-A";
		break;
	case PORT_B:
		intel_dp->aux_ch_ctl_reg = PCH_DPB_AUX_CH_CTL;
		name = "DPDDC-B";
		break;
	case PORT_C:
		intel_dp->aux_ch_ctl_reg = PCH_DPC_AUX_CH_CTL;
		name = "DPDDC-C";
		break;
	case PORT_D:
		intel_dp->aux_ch_ctl_reg = PCH_DPD_AUX_CH_CTL;
		name = "DPDDC-D";
		break;
	default:
		BUG();
	}
 
	if (!HAS_DDI(dev))
		intel_dp->aux_ch_ctl_reg = intel_dp->output_reg + 0x10;
 
	intel_dp->aux.name = name;
	intel_dp->aux.dev = dev->dev;
	intel_dp->aux.transfer = intel_dp_aux_transfer;
 
 
	ret = drm_dp_aux_register(&intel_dp->aux);
		if (ret < 0) {
		DRM_ERROR("drm_dp_aux_register() for %s failed (%d)\n",
			  name, ret);
		return;
	}
}
 
static void
intel_dp_connector_unregister(struct intel_connector *intel_connector)
{
	struct intel_dp *intel_dp = intel_attached_dp(&intel_connector->base);
 
	intel_connector_unregister(intel_connector);
}
 
static void
hsw_dp_set_ddi_pll_sel(struct intel_crtc_config *pipe_config, int link_bw)
{
	switch (link_bw) {
	case DP_LINK_BW_1_62:
		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
		break;
	case DP_LINK_BW_2_7:
		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
		break;
	case DP_LINK_BW_5_4:
		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
		break;
	}
}
 
static void
intel_dp_set_clock(struct intel_encoder *encoder,
		   struct intel_crtc_config *pipe_config, int link_bw)
{
	struct drm_device *dev = encoder->base.dev;
	const struct dp_link_dpll *divisor = NULL;
	int i, count = 0;
 
	if (IS_G4X(dev)) {
		divisor = gen4_dpll;
		count = ARRAY_SIZE(gen4_dpll);
	} else if (HAS_PCH_SPLIT(dev)) {
		divisor = pch_dpll;
		count = ARRAY_SIZE(pch_dpll);
	} else if (IS_CHERRYVIEW(dev)) {
		divisor = chv_dpll;
		count = ARRAY_SIZE(chv_dpll);
	} else if (IS_VALLEYVIEW(dev)) {
		divisor = vlv_dpll;
		count = ARRAY_SIZE(vlv_dpll);
	}
 
	if (divisor && count) {
		for (i = 0; i < count; i++) {
			if (link_bw == divisor[i].link_bw) {
				pipe_config->dpll = divisor[i].dpll;
				pipe_config->clock_set = true;
				break;
			}
		}
	}
}
 
static void
intel_dp_set_m2_n2(struct intel_crtc *crtc, struct intel_link_m_n *m_n)
{
	struct drm_device *dev = crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum transcoder transcoder = crtc->config.cpu_transcoder;
 
	I915_WRITE(PIPE_DATA_M2(transcoder),
		TU_SIZE(m_n->tu) | m_n->gmch_m);
	I915_WRITE(PIPE_DATA_N2(transcoder), m_n->gmch_n);
	I915_WRITE(PIPE_LINK_M2(transcoder), m_n->link_m);
	I915_WRITE(PIPE_LINK_N2(transcoder), m_n->link_n);
}
 
bool
intel_dp_compute_config(struct intel_encoder *encoder,
			struct intel_crtc_config *pipe_config)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	enum port port = dp_to_dig_port(intel_dp)->port;
	struct intel_crtc *intel_crtc = encoder->new_crtc;
	struct intel_connector *intel_connector = intel_dp->attached_connector;
	int lane_count, clock;
	int min_lane_count = 1;
	int max_lane_count = intel_dp_max_lane_count(intel_dp);
	/* Conveniently, the link BW constants become indices with a shift...*/
	int min_clock = 0;
	int max_clock = intel_dp_max_link_bw(intel_dp) >> 3;
	int bpp, mode_rate;
	static int bws[] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4 };
	int link_avail, link_clock;
 
	if (HAS_PCH_SPLIT(dev) && !HAS_DDI(dev) && port != PORT_A)
		pipe_config->has_pch_encoder = true;
 
	pipe_config->has_dp_encoder = true;
	pipe_config->has_audio = intel_dp->has_audio;
 
	if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
		intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
				       adjusted_mode);
		if (!HAS_PCH_SPLIT(dev))
			intel_gmch_panel_fitting(intel_crtc, pipe_config,
						 intel_connector->panel.fitting_mode);
		else
			intel_pch_panel_fitting(intel_crtc, pipe_config,
						intel_connector->panel.fitting_mode);
	}
 
	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
		return false;
 
	DRM_DEBUG_KMS("DP link computation with max lane count %i "
		      "max bw %02x pixel clock %iKHz\n",
		      max_lane_count, bws[max_clock],
		      adjusted_mode->crtc_clock);
 
	/* Walk through all bpp values. Luckily they're all nicely spaced with 2
	 * bpc in between. */
	bpp = pipe_config->pipe_bpp;
	if (is_edp(intel_dp)) {
		if (dev_priv->vbt.edp_bpp && dev_priv->vbt.edp_bpp < bpp) {
		DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided %i\n",
			      dev_priv->vbt.edp_bpp);
		bpp = dev_priv->vbt.edp_bpp;
	}
 
		if (IS_BROADWELL(dev)) {
			/* Yes, it's an ugly hack. */
			min_lane_count = max_lane_count;
			DRM_DEBUG_KMS("forcing lane count to max (%u) on BDW\n",
				      min_lane_count);
		} else if (dev_priv->vbt.edp_lanes) {
			min_lane_count = min(dev_priv->vbt.edp_lanes,
					     max_lane_count);
			DRM_DEBUG_KMS("using min %u lanes per VBT\n",
				      min_lane_count);
		}
 
		if (dev_priv->vbt.edp_rate) {
			min_clock = min(dev_priv->vbt.edp_rate >> 3, max_clock);
			DRM_DEBUG_KMS("using min %02x link bw per VBT\n",
				      bws[min_clock]);
		}
	}
 
	for (; bpp >= 6*3; bpp -= 2*3) {
		mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
						   bpp);
 
		for (clock = min_clock; clock <= max_clock; clock++) {
		for (lane_count = min_lane_count; lane_count <= max_lane_count; lane_count <<= 1) {
				link_clock = drm_dp_bw_code_to_link_rate(bws[clock]);
				link_avail = intel_dp_max_data_rate(link_clock,
								    lane_count);
 
				if (mode_rate <= link_avail) {
					goto found;
				}
			}
		}
	}
 
		return false;
 
found:
	if (intel_dp->color_range_auto) {
		/*
		 * See:
		 * CEA-861-E - 5.1 Default Encoding Parameters
		 * VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
		 */
		if (bpp != 18 && drm_match_cea_mode(adjusted_mode) > 1)
			intel_dp->color_range = DP_COLOR_RANGE_16_235;
		else
			intel_dp->color_range = 0;
	}
 
	if (intel_dp->color_range)
		pipe_config->limited_color_range = true;
 
				intel_dp->link_bw = bws[clock];
				intel_dp->lane_count = lane_count;
	pipe_config->pipe_bpp = bpp;
	pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
 
	DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n",
				       intel_dp->link_bw, intel_dp->lane_count,
		      pipe_config->port_clock, bpp);
				DRM_DEBUG_KMS("DP link bw required %i available %i\n",
					      mode_rate, link_avail);
 
	intel_link_compute_m_n(bpp, lane_count,
			       adjusted_mode->crtc_clock,
			       pipe_config->port_clock,
			       &pipe_config->dp_m_n);
 
	if (intel_connector->panel.downclock_mode != NULL &&
		intel_dp->drrs_state.type == SEAMLESS_DRRS_SUPPORT) {
			intel_link_compute_m_n(bpp, lane_count,
				intel_connector->panel.downclock_mode->clock,
				pipe_config->port_clock,
				&pipe_config->dp_m2_n2);
	}
 
	if (HAS_DDI(dev))
		hsw_dp_set_ddi_pll_sel(pipe_config, intel_dp->link_bw);
	else
	intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
 
	return true;
}
 
static void ironlake_set_pll_cpu_edp(struct intel_dp *intel_dp)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
	struct drm_device *dev = crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 dpa_ctl;
 
	DRM_DEBUG_KMS("eDP PLL enable for clock %d\n", crtc->config.port_clock);
	dpa_ctl = I915_READ(DP_A);
	dpa_ctl &= ~DP_PLL_FREQ_MASK;
 
	if (crtc->config.port_clock == 162000) {
		/* For a long time we've carried around a ILK-DevA w/a for the
		 * 160MHz clock. If we're really unlucky, it's still required.
		 */
		DRM_DEBUG_KMS("160MHz cpu eDP clock, might need ilk devA w/a\n");
		dpa_ctl |= DP_PLL_FREQ_160MHZ;
		intel_dp->DP |= DP_PLL_FREQ_160MHZ;
	} else {
		dpa_ctl |= DP_PLL_FREQ_270MHZ;
		intel_dp->DP |= DP_PLL_FREQ_270MHZ;
	}
 
	I915_WRITE(DP_A, dpa_ctl);
 
	POSTING_READ(DP_A);
	udelay(500);
}
 
static void intel_dp_prepare(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	enum port port = dp_to_dig_port(intel_dp)->port;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
 
	/*
	 * There are four kinds of DP registers:
	 *
	 * 	IBX PCH
	 * 	SNB CPU
	 *	IVB CPU
	 * 	CPT PCH
	 *
	 * IBX PCH and CPU are the same for almost everything,
	 * except that the CPU DP PLL is configured in this
	 * register
	 *
	 * CPT PCH is quite different, having many bits moved
	 * to the TRANS_DP_CTL register instead. That
	 * configuration happens (oddly) in ironlake_pch_enable
	 */
 
	/* Preserve the BIOS-computed detected bit. This is
	 * supposed to be read-only.
	 */
	intel_dp->DP = I915_READ(intel_dp->output_reg) & DP_DETECTED;
 
	/* Handle DP bits in common between all three register formats */
	intel_dp->DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
	intel_dp->DP |= DP_PORT_WIDTH(intel_dp->lane_count);
 
	if (crtc->config.has_audio) {
		DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
				 pipe_name(crtc->pipe));
		intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
		intel_write_eld(&encoder->base, adjusted_mode);
	}
 
	/* Split out the IBX/CPU vs CPT settings */
 
	if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) {
		if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
			intel_dp->DP |= DP_SYNC_HS_HIGH;
		if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
			intel_dp->DP |= DP_SYNC_VS_HIGH;
		intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
 
		if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
			intel_dp->DP |= DP_ENHANCED_FRAMING;
 
		intel_dp->DP |= crtc->pipe << 29;
	} else if (!HAS_PCH_CPT(dev) || port == PORT_A) {
		if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev))
		intel_dp->DP |= intel_dp->color_range;
 
		if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
			intel_dp->DP |= DP_SYNC_HS_HIGH;
		if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
			intel_dp->DP |= DP_SYNC_VS_HIGH;
		intel_dp->DP |= DP_LINK_TRAIN_OFF;
 
		if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
		intel_dp->DP |= DP_ENHANCED_FRAMING;
 
		if (!IS_CHERRYVIEW(dev)) {
		if (crtc->pipe == 1)
		intel_dp->DP |= DP_PIPEB_SELECT;
	} else {
			intel_dp->DP |= DP_PIPE_SELECT_CHV(crtc->pipe);
		}
	} else {
		intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
	}
}
 
#define IDLE_ON_MASK		(PP_ON | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
#define IDLE_ON_VALUE   	(PP_ON | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_ON_IDLE)
 
#define IDLE_OFF_MASK		(PP_ON | PP_SEQUENCE_MASK | 0                     | 0)
#define IDLE_OFF_VALUE		(0     | PP_SEQUENCE_NONE | 0                     | 0)
 
#define IDLE_CYCLE_MASK		(PP_ON | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
#define IDLE_CYCLE_VALUE	(0     | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_OFF_IDLE)
 
static void wait_panel_status(struct intel_dp *intel_dp,
				       u32 mask,
				       u32 value)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp_stat_reg, pp_ctrl_reg;
 
	pp_stat_reg = _pp_stat_reg(intel_dp);
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
	DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n",
		      mask, value,
			I915_READ(pp_stat_reg),
			I915_READ(pp_ctrl_reg));
 
	if (_wait_for((I915_READ(pp_stat_reg) & mask) == value, 5000, 10)) {
		DRM_ERROR("Panel status timeout: status %08x control %08x\n",
				I915_READ(pp_stat_reg),
				I915_READ(pp_ctrl_reg));
	}
 
	DRM_DEBUG_KMS("Wait complete\n");
}
 
static void wait_panel_on(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power on\n");
	wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
}
 
static void wait_panel_off(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power off time\n");
	wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
}
 
static void wait_panel_power_cycle(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power cycle\n");
 
	/* When we disable the VDD override bit last we have to do the manual
	 * wait. */
	wait_remaining_ms_from_jiffies(intel_dp->last_power_cycle,
				       intel_dp->panel_power_cycle_delay);
 
	wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
}
 
static void wait_backlight_on(struct intel_dp *intel_dp)
{
	wait_remaining_ms_from_jiffies(intel_dp->last_power_on,
				       intel_dp->backlight_on_delay);
}
 
static void edp_wait_backlight_off(struct intel_dp *intel_dp)
{
	wait_remaining_ms_from_jiffies(intel_dp->last_backlight_off,
				       intel_dp->backlight_off_delay);
}
 
/* Read the current pp_control value, unlocking the register if it
 * is locked
 */
 
static  u32 ironlake_get_pp_control(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 control;
 
	control = I915_READ(_pp_ctrl_reg(intel_dp));
	control &= ~PANEL_UNLOCK_MASK;
	control |= PANEL_UNLOCK_REGS;
	return control;
}
 
static bool _edp_panel_vdd_on(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	u32 pp;
	u32 pp_stat_reg, pp_ctrl_reg;
	bool need_to_disable = !intel_dp->want_panel_vdd;
 
	if (!is_edp(intel_dp))
		return false;
 
	intel_dp->want_panel_vdd = true;
 
	if (edp_have_panel_vdd(intel_dp))
		return need_to_disable;
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	DRM_DEBUG_KMS("Turning eDP VDD on\n");
 
	if (!edp_have_panel_power(intel_dp))
		wait_panel_power_cycle(intel_dp);
 
	pp = ironlake_get_pp_control(intel_dp);
	pp |= EDP_FORCE_VDD;
 
	pp_stat_reg = _pp_stat_reg(intel_dp);
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
	I915_WRITE(pp_ctrl_reg, pp);
	POSTING_READ(pp_ctrl_reg);
	DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
			I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
	/*
	 * If the panel wasn't on, delay before accessing aux channel
	 */
	if (!edp_have_panel_power(intel_dp)) {
		DRM_DEBUG_KMS("eDP was not running\n");
		msleep(intel_dp->panel_power_up_delay);
	}
 
	return need_to_disable;
}
 
void intel_edp_panel_vdd_on(struct intel_dp *intel_dp)
{
	if (is_edp(intel_dp)) {
		bool vdd = _edp_panel_vdd_on(intel_dp);
 
		WARN(!vdd, "eDP VDD already requested on\n");
	}
}
 
static void edp_panel_vdd_off_sync(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;
	u32 pp_stat_reg, pp_ctrl_reg;
 
	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 
	if (!intel_dp->want_panel_vdd && edp_have_panel_vdd(intel_dp)) {
		struct intel_digital_port *intel_dig_port =
						dp_to_dig_port(intel_dp);
		struct intel_encoder *intel_encoder = &intel_dig_port->base;
		enum intel_display_power_domain power_domain;
 
		DRM_DEBUG_KMS("Turning eDP VDD off\n");
 
		pp = ironlake_get_pp_control(intel_dp);
	pp &= ~EDP_FORCE_VDD;
 
		pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
		pp_stat_reg = _pp_stat_reg(intel_dp);
 
		I915_WRITE(pp_ctrl_reg, pp);
		POSTING_READ(pp_ctrl_reg);
 
	/* Make sure sequencer is idle before allowing subsequent activity */
		DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
		I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
 
		if ((pp & POWER_TARGET_ON) == 0)
			intel_dp->last_power_cycle = jiffies;
 
		power_domain = intel_display_port_power_domain(intel_encoder);
		intel_display_power_put(dev_priv, power_domain);
	}
}
 
static void edp_panel_vdd_work(struct work_struct *__work)
{
	struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
						 struct intel_dp, panel_vdd_work);
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
	edp_panel_vdd_off_sync(intel_dp);
	drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
 
static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
{
	unsigned long delay;
 
	/*
	 * Queue the timer to fire a long time from now (relative to the power
	 * down delay) to keep the panel power up across a sequence of
	 * operations.
	 */
	delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
	schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
}
 
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
	if (!is_edp(intel_dp))
		return;
 
	WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");
 
	intel_dp->want_panel_vdd = false;
 
	if (sync)
		edp_panel_vdd_off_sync(intel_dp);
	else
		edp_panel_vdd_schedule_off(intel_dp);
}
 
void intel_edp_panel_on(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;
	u32 pp_ctrl_reg;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("Turn eDP power on\n");
 
	if (edp_have_panel_power(intel_dp)) {
		DRM_DEBUG_KMS("eDP power already on\n");
		return;
	}
 
	wait_panel_power_cycle(intel_dp);
 
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
	pp = ironlake_get_pp_control(intel_dp);
	if (IS_GEN5(dev)) {
	/* ILK workaround: disable reset around power sequence */
	pp &= ~PANEL_POWER_RESET;
		I915_WRITE(pp_ctrl_reg, pp);
		POSTING_READ(pp_ctrl_reg);
	}
 
	pp |= POWER_TARGET_ON;
	if (!IS_GEN5(dev))
		pp |= PANEL_POWER_RESET;
 
	I915_WRITE(pp_ctrl_reg, pp);
	POSTING_READ(pp_ctrl_reg);
 
	wait_panel_on(intel_dp);
	intel_dp->last_power_on = jiffies;
 
	if (IS_GEN5(dev)) {
	pp |= PANEL_POWER_RESET; /* restore panel reset bit */
		I915_WRITE(pp_ctrl_reg, pp);
		POSTING_READ(pp_ctrl_reg);
	}
}
 
void intel_edp_panel_off(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	u32 pp;
	u32 pp_ctrl_reg;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("Turn eDP power off\n");
 
	WARN(!intel_dp->want_panel_vdd, "Need VDD to turn off panel\n");
 
	pp = ironlake_get_pp_control(intel_dp);
	/* We need to switch off panel power _and_ force vdd, for otherwise some
	 * panels get very unhappy and cease to work. */
	pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_FORCE_VDD |
		EDP_BLC_ENABLE);
 
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
	intel_dp->want_panel_vdd = false;
 
	I915_WRITE(pp_ctrl_reg, pp);
	POSTING_READ(pp_ctrl_reg);
 
	intel_dp->last_power_cycle = jiffies;
	wait_panel_off(intel_dp);
 
	/* We got a reference when we enabled the VDD. */
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_put(dev_priv, power_domain);
}
 
void intel_edp_backlight_on(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;
	u32 pp_ctrl_reg;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("\n");
 
	intel_panel_enable_backlight(intel_dp->attached_connector);
 
	/*
	 * If we enable the backlight right away following a panel power
	 * on, we may see slight flicker as the panel syncs with the eDP
	 * link.  So delay a bit to make sure the image is solid before
	 * allowing it to appear.
	 */
	wait_backlight_on(intel_dp);
	pp = ironlake_get_pp_control(intel_dp);
	pp |= EDP_BLC_ENABLE;
 
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
	I915_WRITE(pp_ctrl_reg, pp);
	POSTING_READ(pp_ctrl_reg);
}
 
void intel_edp_backlight_off(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;
	u32 pp_ctrl_reg;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("\n");
	pp = ironlake_get_pp_control(intel_dp);
	pp &= ~EDP_BLC_ENABLE;
 
	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
	I915_WRITE(pp_ctrl_reg, pp);
	POSTING_READ(pp_ctrl_reg);
	intel_dp->last_backlight_off = jiffies;
 
	edp_wait_backlight_off(intel_dp);
 
	intel_panel_disable_backlight(intel_dp->attached_connector);
}
 
static void ironlake_edp_pll_on(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 dpa_ctl;
 
	assert_pipe_disabled(dev_priv,
			     to_intel_crtc(crtc)->pipe);
 
	DRM_DEBUG_KMS("\n");
	dpa_ctl = I915_READ(DP_A);
	WARN(dpa_ctl & DP_PLL_ENABLE, "dp pll on, should be off\n");
	WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n");
 
	/* We don't adjust intel_dp->DP while tearing down the link, to
	 * facilitate link retraining (e.g. after hotplug). Hence clear all
	 * enable bits here to ensure that we don't enable too much. */
	intel_dp->DP &= ~(DP_PORT_EN | DP_AUDIO_OUTPUT_ENABLE);
	intel_dp->DP |= DP_PLL_ENABLE;
	I915_WRITE(DP_A, intel_dp->DP);
	POSTING_READ(DP_A);
	udelay(200);
}
 
static void ironlake_edp_pll_off(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 dpa_ctl;
 
	assert_pipe_disabled(dev_priv,
			     to_intel_crtc(crtc)->pipe);
 
	dpa_ctl = I915_READ(DP_A);
	WARN((dpa_ctl & DP_PLL_ENABLE) == 0,
	     "dp pll off, should be on\n");
	WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n");
 
	/* We can't rely on the value tracked for the DP register in
	 * intel_dp->DP because link_down must not change that (otherwise link
	 * re-training will fail. */
	dpa_ctl &= ~DP_PLL_ENABLE;
	I915_WRITE(DP_A, dpa_ctl);
	POSTING_READ(DP_A);
	udelay(200);
}
 
/* If the sink supports it, try to set the power state appropriately */
void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
{
	int ret, i;
 
	/* Should have a valid DPCD by this point */
	if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)
		return;
 
	if (mode != DRM_MODE_DPMS_ON) {
		ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
						  DP_SET_POWER_D3);
		if (ret != 1)
			DRM_DEBUG_DRIVER("failed to write sink power state\n");
	} else {
		/*
		 * When turning on, we need to retry for 1ms to give the sink
		 * time to wake up.
		 */
		for (i = 0; i < 3; i++) {
			ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
							  DP_SET_POWER_D0);
			if (ret == 1)
				break;
			msleep(1);
		}
	}
}
 
static bool intel_dp_get_hw_state(struct intel_encoder *encoder,
				  enum pipe *pipe)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	enum port port = dp_to_dig_port(intel_dp)->port;
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	u32 tmp;
 
	power_domain = intel_display_port_power_domain(encoder);
	if (!intel_display_power_enabled(dev_priv, power_domain))
		return false;
 
	tmp = I915_READ(intel_dp->output_reg);
 
	if (!(tmp & DP_PORT_EN))
		return false;
 
	if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) {
		*pipe = PORT_TO_PIPE_CPT(tmp);
	} else if (IS_CHERRYVIEW(dev)) {
		*pipe = DP_PORT_TO_PIPE_CHV(tmp);
	} else if (!HAS_PCH_CPT(dev) || port == PORT_A) {
		*pipe = PORT_TO_PIPE(tmp);
	} else {
		u32 trans_sel;
		u32 trans_dp;
		int i;
 
		switch (intel_dp->output_reg) {
		case PCH_DP_B:
			trans_sel = TRANS_DP_PORT_SEL_B;
			break;
		case PCH_DP_C:
			trans_sel = TRANS_DP_PORT_SEL_C;
			break;
		case PCH_DP_D:
			trans_sel = TRANS_DP_PORT_SEL_D;
			break;
		default:
			return true;
		}
 
		for_each_pipe(i) {
			trans_dp = I915_READ(TRANS_DP_CTL(i));
			if ((trans_dp & TRANS_DP_PORT_SEL_MASK) == trans_sel) {
				*pipe = i;
				return true;
			}
		}
 
		DRM_DEBUG_KMS("No pipe for dp port 0x%x found\n",
			      intel_dp->output_reg);
	}
 
	return true;
}
 
static void intel_dp_get_config(struct intel_encoder *encoder,
				struct intel_crtc_config *pipe_config)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	u32 tmp, flags = 0;
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = dp_to_dig_port(intel_dp)->port;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	int dotclock;
 
	tmp = I915_READ(intel_dp->output_reg);
	if (tmp & DP_AUDIO_OUTPUT_ENABLE)
		pipe_config->has_audio = true;
 
	if ((port == PORT_A) || !HAS_PCH_CPT(dev)) {
		if (tmp & DP_SYNC_HS_HIGH)
			flags |= DRM_MODE_FLAG_PHSYNC;
		else
			flags |= DRM_MODE_FLAG_NHSYNC;
 
		if (tmp & DP_SYNC_VS_HIGH)
			flags |= DRM_MODE_FLAG_PVSYNC;
		else
			flags |= DRM_MODE_FLAG_NVSYNC;
	} else {
		tmp = I915_READ(TRANS_DP_CTL(crtc->pipe));
		if (tmp & TRANS_DP_HSYNC_ACTIVE_HIGH)
			flags |= DRM_MODE_FLAG_PHSYNC;
		else
			flags |= DRM_MODE_FLAG_NHSYNC;
 
		if (tmp & TRANS_DP_VSYNC_ACTIVE_HIGH)
			flags |= DRM_MODE_FLAG_PVSYNC;
		else
			flags |= DRM_MODE_FLAG_NVSYNC;
	}
 
	pipe_config->adjusted_mode.flags |= flags;
 
	pipe_config->has_dp_encoder = true;
 
	intel_dp_get_m_n(crtc, pipe_config);
 
	if (port == PORT_A) {
		if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ)
			pipe_config->port_clock = 162000;
		else
			pipe_config->port_clock = 270000;
	}
 
	dotclock = intel_dotclock_calculate(pipe_config->port_clock,
					    &pipe_config->dp_m_n);
 
	if (HAS_PCH_SPLIT(dev_priv->dev) && port != PORT_A)
		ironlake_check_encoder_dotclock(pipe_config, dotclock);
 
	pipe_config->adjusted_mode.crtc_clock = dotclock;
 
	if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp &&
	    pipe_config->pipe_bpp > dev_priv->vbt.edp_bpp) {
		/*
		 * This is a big fat ugly hack.
		 *
		 * Some machines in UEFI boot mode provide us a VBT that has 18
		 * bpp and 1.62 GHz link bandwidth for eDP, which for reasons
		 * unknown we fail to light up. Yet the same BIOS boots up with
		 * 24 bpp and 2.7 GHz link. Use the same bpp as the BIOS uses as
		 * max, not what it tells us to use.
		 *
		 * Note: This will still be broken if the eDP panel is not lit
		 * up by the BIOS, and thus we can't get the mode at module
		 * load.
		 */
		DRM_DEBUG_KMS("pipe has %d bpp for eDP panel, overriding BIOS-provided max %d bpp\n",
			      pipe_config->pipe_bpp, dev_priv->vbt.edp_bpp);
		dev_priv->vbt.edp_bpp = pipe_config->pipe_bpp;
	}
}
 
static bool is_edp_psr(struct intel_dp *intel_dp)
{
	return intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED;
}
 
static bool intel_edp_is_psr_enabled(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	if (!HAS_PSR(dev))
		return false;
 
	return I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE;
}
 
static void intel_edp_psr_write_vsc(struct intel_dp *intel_dp,
				    struct edp_vsc_psr *vsc_psr)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
	u32 ctl_reg = HSW_TVIDEO_DIP_CTL(crtc->config.cpu_transcoder);
	u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(crtc->config.cpu_transcoder);
	uint32_t *data = (uint32_t *) vsc_psr;
	unsigned int i;
 
	/* As per BSPec (Pipe Video Data Island Packet), we need to disable
	   the video DIP being updated before program video DIP data buffer
	   registers for DIP being updated. */
	I915_WRITE(ctl_reg, 0);
	POSTING_READ(ctl_reg);
 
	for (i = 0; i < VIDEO_DIP_VSC_DATA_SIZE; i += 4) {
		if (i < sizeof(struct edp_vsc_psr))
			I915_WRITE(data_reg + i, *data++);
		else
			I915_WRITE(data_reg + i, 0);
	}
 
	I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
	POSTING_READ(ctl_reg);
}
 
static void intel_edp_psr_setup(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct edp_vsc_psr psr_vsc;
 
	/* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
	memset(&psr_vsc, 0, sizeof(psr_vsc));
	psr_vsc.sdp_header.HB0 = 0;
	psr_vsc.sdp_header.HB1 = 0x7;
	psr_vsc.sdp_header.HB2 = 0x2;
	psr_vsc.sdp_header.HB3 = 0x8;
	intel_edp_psr_write_vsc(intel_dp, &psr_vsc);
 
	/* Avoid continuous PSR exit by masking memup and hpd */
	I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
		   EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
}
 
static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t aux_clock_divider;
	int precharge = 0x3;
	int msg_size = 5;       /* Header(4) + Message(1) */
	bool only_standby = false;
 
	aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
 
	if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
		only_standby = true;
 
	/* Enable PSR in sink */
	if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby)
		drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
				   DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
	else
		drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
				   DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
 
	/* Setup AUX registers */
	I915_WRITE(EDP_PSR_AUX_DATA1(dev), EDP_PSR_DPCD_COMMAND);
	I915_WRITE(EDP_PSR_AUX_DATA2(dev), EDP_PSR_DPCD_NORMAL_OPERATION);
	I915_WRITE(EDP_PSR_AUX_CTL(dev),
		   DP_AUX_CH_CTL_TIME_OUT_400us |
		   (msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
		   (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
		   (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
}
 
static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t max_sleep_time = 0x1f;
	uint32_t idle_frames = 1;
	uint32_t val = 0x0;
	const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
	bool only_standby = false;
 
	if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
		only_standby = true;
 
	if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby) {
		val |= EDP_PSR_LINK_STANDBY;
		val |= EDP_PSR_TP2_TP3_TIME_0us;
		val |= EDP_PSR_TP1_TIME_0us;
		val |= EDP_PSR_SKIP_AUX_EXIT;
		val |= IS_BROADWELL(dev) ? BDW_PSR_SINGLE_FRAME : 0;
	} else
		val |= EDP_PSR_LINK_DISABLE;
 
	I915_WRITE(EDP_PSR_CTL(dev), val |
		   (IS_BROADWELL(dev) ? 0 : link_entry_time) |
		   max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
		   idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
		   EDP_PSR_ENABLE);
}
 
static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc = dig_port->base.base.crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
	lockdep_assert_held(&dev_priv->psr.lock);
	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 
	dev_priv->psr.source_ok = false;
 
	if (IS_HASWELL(dev) && dig_port->port != PORT_A) {
		DRM_DEBUG_KMS("HSW ties PSR to DDI A (eDP)\n");
		return false;
	}
 
	if (!i915.enable_psr) {
		DRM_DEBUG_KMS("PSR disable by flag\n");
		return false;
	}
 
	/* Below limitations aren't valid for Broadwell */
	if (IS_BROADWELL(dev))
		goto out;
 
	if (I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config.cpu_transcoder)) &
	    S3D_ENABLE) {
		DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
		return false;
	}
 
	if (intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
		DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
		return false;
	}
 
 out:
	dev_priv->psr.source_ok = true;
	return true;
}
 
static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
	WARN_ON(dev_priv->psr.active);
	lockdep_assert_held(&dev_priv->psr.lock);
 
	/* Enable PSR on the panel */
	intel_edp_psr_enable_sink(intel_dp);
 
	/* Enable PSR on the host */
	intel_edp_psr_enable_source(intel_dp);
 
	dev_priv->psr.active = true;
}
 
void intel_edp_psr_enable(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	if (!HAS_PSR(dev)) {
		DRM_DEBUG_KMS("PSR not supported on this platform\n");
		return;
	}
 
	if (!is_edp_psr(intel_dp)) {
		DRM_DEBUG_KMS("PSR not supported by this panel\n");
		return;
	}
 
	mutex_lock(&dev_priv->psr.lock);
	if (dev_priv->psr.enabled) {
		DRM_DEBUG_KMS("PSR already in use\n");
		mutex_unlock(&dev_priv->psr.lock);
		return;
	}
 
	dev_priv->psr.busy_frontbuffer_bits = 0;
 
	/* Setup PSR once */
	intel_edp_psr_setup(intel_dp);
 
	if (intel_edp_psr_match_conditions(intel_dp))
		dev_priv->psr.enabled = intel_dp;
	mutex_unlock(&dev_priv->psr.lock);
}
 
void intel_edp_psr_disable(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	mutex_lock(&dev_priv->psr.lock);
	if (!dev_priv->psr.enabled) {
		mutex_unlock(&dev_priv->psr.lock);
		return;
	}
 
	if (dev_priv->psr.active) {
	I915_WRITE(EDP_PSR_CTL(dev),
		   I915_READ(EDP_PSR_CTL(dev)) & ~EDP_PSR_ENABLE);
 
	/* Wait till PSR is idle */
	if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev)) &
		       EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
		DRM_ERROR("Timed out waiting for PSR Idle State\n");
 
		dev_priv->psr.active = false;
	} else {
		WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
	}
 
	dev_priv->psr.enabled = NULL;
	mutex_unlock(&dev_priv->psr.lock);
 
	cancel_delayed_work_sync(&dev_priv->psr.work);
}
 
static void intel_edp_psr_work(struct work_struct *work)
{
	struct drm_i915_private *dev_priv =
		container_of(work, typeof(*dev_priv), psr.work.work);
	struct intel_dp *intel_dp = dev_priv->psr.enabled;
 
	mutex_lock(&dev_priv->psr.lock);
	intel_dp = dev_priv->psr.enabled;
 
	if (!intel_dp)
		goto unlock;
 
	/*
	 * The delayed work can race with an invalidate hence we need to
	 * recheck. Since psr_flush first clears this and then reschedules we
	 * won't ever miss a flush when bailing out here.
	 */
	if (dev_priv->psr.busy_frontbuffer_bits)
		goto unlock;
 
	intel_edp_psr_do_enable(intel_dp);
unlock:
	mutex_unlock(&dev_priv->psr.lock);
}
 
static void intel_edp_psr_do_exit(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	if (dev_priv->psr.active) {
		u32 val = I915_READ(EDP_PSR_CTL(dev));
 
		WARN_ON(!(val & EDP_PSR_ENABLE));
 
		I915_WRITE(EDP_PSR_CTL(dev), val & ~EDP_PSR_ENABLE);
 
		dev_priv->psr.active = false;
	}
 
}
 
void intel_edp_psr_invalidate(struct drm_device *dev,
			      unsigned frontbuffer_bits)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;
	enum pipe pipe;
 
	mutex_lock(&dev_priv->psr.lock);
	if (!dev_priv->psr.enabled) {
		mutex_unlock(&dev_priv->psr.lock);
				return;
	}
 
	crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
	pipe = to_intel_crtc(crtc)->pipe;
 
	intel_edp_psr_do_exit(dev);
 
	frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
 
	dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
	mutex_unlock(&dev_priv->psr.lock);
}
 
void intel_edp_psr_flush(struct drm_device *dev,
			 unsigned frontbuffer_bits)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;
	enum pipe pipe;
 
	mutex_lock(&dev_priv->psr.lock);
	if (!dev_priv->psr.enabled) {
		mutex_unlock(&dev_priv->psr.lock);
		return;
		}
 
	crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
	pipe = to_intel_crtc(crtc)->pipe;
	dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
 
	/*
	 * On Haswell sprite plane updates don't result in a psr invalidating
	 * signal in the hardware. Which means we need to manually fake this in
	 * software for all flushes, not just when we've seen a preceding
	 * invalidation through frontbuffer rendering.
	 */
	if (IS_HASWELL(dev) &&
	    (frontbuffer_bits & INTEL_FRONTBUFFER_SPRITE(pipe)))
		intel_edp_psr_do_exit(dev);
 
	if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
		schedule_delayed_work(&dev_priv->psr.work,
				      msecs_to_jiffies(100));
	mutex_unlock(&dev_priv->psr.lock);
}
 
void intel_edp_psr_init(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	INIT_DELAYED_WORK(&dev_priv->psr.work, intel_edp_psr_work);
	mutex_init(&dev_priv->psr.lock);
}
 
static void intel_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	enum port port = dp_to_dig_port(intel_dp)->port;
	struct drm_device *dev = encoder->base.dev;
 
	/* Make sure the panel is off before trying to change the mode. But also
	 * ensure that we have vdd while we switch off the panel. */
	intel_edp_panel_vdd_on(intel_dp);
	intel_edp_backlight_off(intel_dp);
	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
	intel_edp_panel_off(intel_dp);
 
	/* cpu edp my only be disable _after_ the cpu pipe/plane is disabled. */
	if (!(port == PORT_A || IS_VALLEYVIEW(dev)))
		intel_dp_link_down(intel_dp);
}
 
static void g4x_post_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	enum port port = dp_to_dig_port(intel_dp)->port;
 
	if (port != PORT_A)
		return;
 
	intel_dp_link_down(intel_dp);
	ironlake_edp_pll_off(intel_dp);
}
 
static void vlv_post_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	intel_dp_link_down(intel_dp);
}
 
static void chv_post_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	enum pipe pipe = intel_crtc->pipe;
	u32 val;
 
		intel_dp_link_down(intel_dp);
 
	mutex_lock(&dev_priv->dpio_lock);
 
	/* Propagate soft reset to data lane reset */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
	val |= CHV_PCS_REQ_SOFTRESET_EN;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
	val |= CHV_PCS_REQ_SOFTRESET_EN;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
 
	mutex_unlock(&dev_priv->dpio_lock);
}
 
static void intel_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t dp_reg = I915_READ(intel_dp->output_reg);
 
	if (WARN_ON(dp_reg & DP_PORT_EN))
		return;
 
	intel_edp_panel_vdd_on(intel_dp);
	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
			intel_dp_start_link_train(intel_dp);
	intel_edp_panel_on(intel_dp);
	edp_panel_vdd_off(intel_dp, true);
			intel_dp_complete_link_train(intel_dp);
	intel_dp_stop_link_train(intel_dp);
}
 
static void g4x_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	intel_enable_dp(encoder);
	intel_edp_backlight_on(intel_dp);
}
 
static void vlv_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	intel_edp_backlight_on(intel_dp);
}
 
static void g4x_pre_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
 
	intel_dp_prepare(encoder);
 
	/* Only ilk+ has port A */
	if (dport->port == PORT_A) {
		ironlake_set_pll_cpu_edp(intel_dp);
		ironlake_edp_pll_on(intel_dp);
	}
}
 
static void vlv_pre_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
	enum dpio_channel port = vlv_dport_to_channel(dport);
		int pipe = intel_crtc->pipe;
	struct edp_power_seq power_seq;
		u32 val;
 
	mutex_lock(&dev_priv->dpio_lock);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
		val = 0;
		if (pipe)
			val |= (1<<21);
		else
			val &= ~(1<<21);
		val |= 0x001000c4;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW8(port), val);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW14(port), 0x00760018);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW23(port), 0x00400888);
 
	mutex_unlock(&dev_priv->dpio_lock);
 
	if (is_edp(intel_dp)) {
	/* init power sequencer on this pipe and port */
	intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
	intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
						      &power_seq);
	}
 
	intel_enable_dp(encoder);
 
	vlv_wait_port_ready(dev_priv, dport);
}
 
static void vlv_dp_pre_pll_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel port = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;
 
	intel_dp_prepare(encoder);
 
	/* Program Tx lane resets to default */
	mutex_lock(&dev_priv->dpio_lock);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),
			 DPIO_PCS_TX_LANE2_RESET |
			 DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port),
			 DPIO_PCS_CLK_CRI_RXEB_EIOS_EN |
			 DPIO_PCS_CLK_CRI_RXDIGFILTSG_EN |
			 (1<
				 DPIO_PCS_CLK_SOFT_RESET);
 
	/* Fix up inter-pair skew failure */
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW12(port), 0x00750f00);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW11(port), 0x00001500);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW14(port), 0x40400000);
	mutex_unlock(&dev_priv->dpio_lock);
}
 
static void chv_pre_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct edp_power_seq power_seq;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;
	int data, i;
	u32 val;
 
	mutex_lock(&dev_priv->dpio_lock);
 
	/* Deassert soft data lane reset*/
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
	val |= CHV_PCS_REQ_SOFTRESET_EN;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
	val |= CHV_PCS_REQ_SOFTRESET_EN;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
	val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
	val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
 
	/* Program Tx lane latency optimal setting*/
	for (i = 0; i < 4; i++) {
		/* Set the latency optimal bit */
		data = (i == 1) ? 0x0 : 0x6;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW11(ch, i),
				data << DPIO_FRC_LATENCY_SHFIT);
 
		/* Set the upar bit */
		data = (i == 1) ? 0x0 : 0x1;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i),
				data << DPIO_UPAR_SHIFT);
	}
 
	/* Data lane stagger programming */
	/* FIXME: Fix up value only after power analysis */
 
	mutex_unlock(&dev_priv->dpio_lock);
 
	if (is_edp(intel_dp)) {
		/* init power sequencer on this pipe and port */
		intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
		intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
							      &power_seq);
	}
 
	intel_enable_dp(encoder);
 
	vlv_wait_port_ready(dev_priv, dport);
}
 
static void chv_dp_pre_pll_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	enum pipe pipe = intel_crtc->pipe;
	u32 val;
 
	mutex_lock(&dev_priv->dpio_lock);
 
	/* program left/right clock distribution */
	if (pipe != PIPE_B) {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
		val &= ~(CHV_BUFLEFTENA1_MASK | CHV_BUFRIGHTENA1_MASK);
		if (ch == DPIO_CH0)
			val |= CHV_BUFLEFTENA1_FORCE;
		if (ch == DPIO_CH1)
			val |= CHV_BUFRIGHTENA1_FORCE;
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW5_CH0, val);
	} else {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW1_CH1);
		val &= ~(CHV_BUFLEFTENA2_MASK | CHV_BUFRIGHTENA2_MASK);
		if (ch == DPIO_CH0)
			val |= CHV_BUFLEFTENA2_FORCE;
		if (ch == DPIO_CH1)
			val |= CHV_BUFRIGHTENA2_FORCE;
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val);
	}
 
	/* program clock channel usage */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(ch));
	val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
	if (pipe != PIPE_B)
		val &= ~CHV_PCS_USEDCLKCHANNEL;
	else
		val |= CHV_PCS_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW8(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW8(ch));
	val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
	if (pipe != PIPE_B)
		val &= ~CHV_PCS_USEDCLKCHANNEL;
	else
		val |= CHV_PCS_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW8(ch), val);
 
	/*
	 * This a a bit weird since generally CL
	 * matches the pipe, but here we need to
	 * pick the CL based on the port.
	 */
	val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW19(ch));
	if (pipe != PIPE_B)
		val &= ~CHV_CMN_USEDCLKCHANNEL;
	else
		val |= CHV_CMN_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val);
 
	mutex_unlock(&dev_priv->dpio_lock);
}
 
/*
 * Native read with retry for link status and receiver capability reads for
 * cases where the sink may still be asleep.
 *
 * Sinks are *supposed* to come up within 1ms from an off state, but we're also
 * supposed to retry 3 times per the spec.
 */
static ssize_t
intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset,
			void *buffer, size_t size)
{
	ssize_t ret;
	int i;
 
	for (i = 0; i < 3; i++) {
		ret = drm_dp_dpcd_read(aux, offset, buffer, size);
		if (ret == size)
			return ret;
		msleep(1);
	}
 
	return ret;
}
 
/*
 * Fetch AUX CH registers 0x202 - 0x207 which contain
 * link status information
 */
static bool
intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
{
	return intel_dp_dpcd_read_wake(&intel_dp->aux,
					      DP_LANE0_1_STATUS,
					      link_status,
				       DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE;
}
 
/* These are source-specific values. */
static uint8_t
intel_dp_voltage_max(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	enum port port = dp_to_dig_port(intel_dp)->port;
 
	if (IS_VALLEYVIEW(dev))
		return DP_TRAIN_VOLTAGE_SWING_1200;
	else if (IS_GEN7(dev) && port == PORT_A)
		return DP_TRAIN_VOLTAGE_SWING_800;
	else if (HAS_PCH_CPT(dev) && port != PORT_A)
		return DP_TRAIN_VOLTAGE_SWING_1200;
	else
		return DP_TRAIN_VOLTAGE_SWING_800;
}
 
static uint8_t
intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	enum port port = dp_to_dig_port(intel_dp)->port;
 
	if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
		switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			return DP_TRAIN_PRE_EMPHASIS_9_5;
		case DP_TRAIN_VOLTAGE_SWING_600:
			return DP_TRAIN_PRE_EMPHASIS_6;
		case DP_TRAIN_VOLTAGE_SWING_800:
			return DP_TRAIN_PRE_EMPHASIS_3_5;
		case DP_TRAIN_VOLTAGE_SWING_1200:
		default:
			return DP_TRAIN_PRE_EMPHASIS_0;
		}
	} else if (IS_VALLEYVIEW(dev)) {
		switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			return DP_TRAIN_PRE_EMPHASIS_9_5;
		case DP_TRAIN_VOLTAGE_SWING_600:
			return DP_TRAIN_PRE_EMPHASIS_6;
		case DP_TRAIN_VOLTAGE_SWING_800:
			return DP_TRAIN_PRE_EMPHASIS_3_5;
		case DP_TRAIN_VOLTAGE_SWING_1200:
		default:
			return DP_TRAIN_PRE_EMPHASIS_0;
		}
	} else if (IS_GEN7(dev) && port == PORT_A) {
		switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			return DP_TRAIN_PRE_EMPHASIS_6;
		case DP_TRAIN_VOLTAGE_SWING_600:
		case DP_TRAIN_VOLTAGE_SWING_800:
			return DP_TRAIN_PRE_EMPHASIS_3_5;
		default:
			return DP_TRAIN_PRE_EMPHASIS_0;
		}
	} else {
	switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
	case DP_TRAIN_VOLTAGE_SWING_400:
		return DP_TRAIN_PRE_EMPHASIS_6;
	case DP_TRAIN_VOLTAGE_SWING_600:
		return DP_TRAIN_PRE_EMPHASIS_6;
	case DP_TRAIN_VOLTAGE_SWING_800:
		return DP_TRAIN_PRE_EMPHASIS_3_5;
	case DP_TRAIN_VOLTAGE_SWING_1200:
	default:
		return DP_TRAIN_PRE_EMPHASIS_0;
	}
	}
}
 
static uint32_t intel_vlv_signal_levels(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
	struct intel_crtc *intel_crtc =
		to_intel_crtc(dport->base.base.crtc);
	unsigned long demph_reg_value, preemph_reg_value,
		uniqtranscale_reg_value;
	uint8_t train_set = intel_dp->train_set[0];
	enum dpio_channel port = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;
 
	switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
	case DP_TRAIN_PRE_EMPHASIS_0:
		preemph_reg_value = 0x0004000;
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			demph_reg_value = 0x2B405555;
			uniqtranscale_reg_value = 0x552AB83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			demph_reg_value = 0x2B404040;
			uniqtranscale_reg_value = 0x5548B83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_800:
			demph_reg_value = 0x2B245555;
			uniqtranscale_reg_value = 0x5560B83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_1200:
			demph_reg_value = 0x2B405555;
			uniqtranscale_reg_value = 0x5598DA3A;
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_3_5:
		preemph_reg_value = 0x0002000;
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			demph_reg_value = 0x2B404040;
			uniqtranscale_reg_value = 0x5552B83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			demph_reg_value = 0x2B404848;
			uniqtranscale_reg_value = 0x5580B83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_800:
			demph_reg_value = 0x2B404040;
			uniqtranscale_reg_value = 0x55ADDA3A;
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_6:
		preemph_reg_value = 0x0000000;
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			demph_reg_value = 0x2B305555;
			uniqtranscale_reg_value = 0x5570B83A;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			demph_reg_value = 0x2B2B4040;
			uniqtranscale_reg_value = 0x55ADDA3A;
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_9_5:
		preemph_reg_value = 0x0006000;
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			demph_reg_value = 0x1B405555;
			uniqtranscale_reg_value = 0x55ADDA3A;
			break;
		default:
			return 0;
		}
		break;
	default:
		return 0;
	}
 
	mutex_lock(&dev_priv->dpio_lock);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x00000000);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(port), demph_reg_value);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(port),
			 uniqtranscale_reg_value);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(port), 0x0C782040);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW11(port), 0x00030000);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), preemph_reg_value);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x80000000);
	mutex_unlock(&dev_priv->dpio_lock);
 
	return 0;
}
 
static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
	struct intel_crtc *intel_crtc = to_intel_crtc(dport->base.base.crtc);
	u32 deemph_reg_value, margin_reg_value, val;
	uint8_t train_set = intel_dp->train_set[0];
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	enum pipe pipe = intel_crtc->pipe;
	int i;
 
	switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
	case DP_TRAIN_PRE_EMPHASIS_0:
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			deemph_reg_value = 128;
			margin_reg_value = 52;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			deemph_reg_value = 128;
			margin_reg_value = 77;
			break;
		case DP_TRAIN_VOLTAGE_SWING_800:
			deemph_reg_value = 128;
			margin_reg_value = 102;
			break;
		case DP_TRAIN_VOLTAGE_SWING_1200:
			deemph_reg_value = 128;
			margin_reg_value = 154;
			/* FIXME extra to set for 1200 */
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_3_5:
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			deemph_reg_value = 85;
			margin_reg_value = 78;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			deemph_reg_value = 85;
			margin_reg_value = 116;
			break;
		case DP_TRAIN_VOLTAGE_SWING_800:
			deemph_reg_value = 85;
			margin_reg_value = 154;
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_6:
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			deemph_reg_value = 64;
			margin_reg_value = 104;
			break;
		case DP_TRAIN_VOLTAGE_SWING_600:
			deemph_reg_value = 64;
			margin_reg_value = 154;
			break;
		default:
			return 0;
		}
		break;
	case DP_TRAIN_PRE_EMPHASIS_9_5:
		switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
		case DP_TRAIN_VOLTAGE_SWING_400:
			deemph_reg_value = 43;
			margin_reg_value = 154;
			break;
		default:
			return 0;
		}
		break;
	default:
		return 0;
	}
 
	mutex_lock(&dev_priv->dpio_lock);
 
	/* Clear calc init */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
	val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
	val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);
 
	/* Program swing deemph */
	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i));
		val &= ~DPIO_SWING_DEEMPH9P5_MASK;
		val |= deemph_reg_value << DPIO_SWING_DEEMPH9P5_SHIFT;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val);
	}
 
	/* Program swing margin */
	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
		val &= ~DPIO_SWING_MARGIN_MASK;
		val |= margin_reg_value << DPIO_SWING_MARGIN_SHIFT;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
	}
 
	/* Disable unique transition scale */
	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
		val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
	}
 
	if (((train_set & DP_TRAIN_PRE_EMPHASIS_MASK)
			== DP_TRAIN_PRE_EMPHASIS_0) &&
		((train_set & DP_TRAIN_VOLTAGE_SWING_MASK)
			== DP_TRAIN_VOLTAGE_SWING_1200)) {
 
		/*
		 * The document said it needs to set bit 27 for ch0 and bit 26
		 * for ch1. Might be a typo in the doc.
		 * For now, for this unique transition scale selection, set bit
		 * 27 for ch0 and ch1.
		 */
		for (i = 0; i < 4; i++) {
			val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
			val |= DPIO_TX_UNIQ_TRANS_SCALE_EN;
			vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
		}
 
		for (i = 0; i < 4; i++) {
			val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
			val &= ~(0xff << DPIO_UNIQ_TRANS_SCALE_SHIFT);
			val |= (0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT);
			vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
		}
	}
 
	/* Start swing calculation */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
	val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);
 
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
	val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);
 
	/* LRC Bypass */
	val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
	val |= DPIO_LRC_BYPASS;
	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, val);
 
	mutex_unlock(&dev_priv->dpio_lock);
 
	return 0;
}
 
static void
intel_get_adjust_train(struct intel_dp *intel_dp,
		       const uint8_t link_status[DP_LINK_STATUS_SIZE])
{
	uint8_t v = 0;
	uint8_t p = 0;
	int lane;
	uint8_t voltage_max;
	uint8_t preemph_max;
 
	for (lane = 0; lane < intel_dp->lane_count; lane++) {
		uint8_t this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
		uint8_t this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 
		if (this_v > v)
			v = this_v;
		if (this_p > p)
			p = this_p;
	}
 
	voltage_max = intel_dp_voltage_max(intel_dp);
	if (v >= voltage_max)
		v = voltage_max | DP_TRAIN_MAX_SWING_REACHED;
 
	preemph_max = intel_dp_pre_emphasis_max(intel_dp, v);
	if (p >= preemph_max)
		p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 
	for (lane = 0; lane < 4; lane++)
		intel_dp->train_set[lane] = v | p;
}
 
static uint32_t
intel_gen4_signal_levels(uint8_t train_set)
{
	uint32_t	signal_levels = 0;
 
	switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
	case DP_TRAIN_VOLTAGE_SWING_400:
	default:
		signal_levels |= DP_VOLTAGE_0_4;
		break;
	case DP_TRAIN_VOLTAGE_SWING_600:
		signal_levels |= DP_VOLTAGE_0_6;
		break;
	case DP_TRAIN_VOLTAGE_SWING_800:
		signal_levels |= DP_VOLTAGE_0_8;
		break;
	case DP_TRAIN_VOLTAGE_SWING_1200:
		signal_levels |= DP_VOLTAGE_1_2;
		break;
	}
	switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
	case DP_TRAIN_PRE_EMPHASIS_0:
	default:
		signal_levels |= DP_PRE_EMPHASIS_0;
		break;
	case DP_TRAIN_PRE_EMPHASIS_3_5:
		signal_levels |= DP_PRE_EMPHASIS_3_5;
		break;
	case DP_TRAIN_PRE_EMPHASIS_6:
		signal_levels |= DP_PRE_EMPHASIS_6;
		break;
	case DP_TRAIN_PRE_EMPHASIS_9_5:
		signal_levels |= DP_PRE_EMPHASIS_9_5;
		break;
	}
	return signal_levels;
}
 
/* Gen6's DP voltage swing and pre-emphasis control */
static uint32_t
intel_gen6_edp_signal_levels(uint8_t train_set)
{
	int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
					 DP_TRAIN_PRE_EMPHASIS_MASK);
	switch (signal_levels) {
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_0:
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_0:
		return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return EDP_LINK_TRAIN_400MV_3_5DB_SNB_B;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_6:
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_6:
		return EDP_LINK_TRAIN_400_600MV_6DB_SNB_B;
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_3_5:
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return EDP_LINK_TRAIN_600_800MV_3_5DB_SNB_B;
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_0:
	case DP_TRAIN_VOLTAGE_SWING_1200 | DP_TRAIN_PRE_EMPHASIS_0:
		return EDP_LINK_TRAIN_800_1200MV_0DB_SNB_B;
	default:
		DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
			      "0x%x\n", signal_levels);
		return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B;
	}
}
 
/* Gen7's DP voltage swing and pre-emphasis control */
static uint32_t
intel_gen7_edp_signal_levels(uint8_t train_set)
{
	int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
					 DP_TRAIN_PRE_EMPHASIS_MASK);
	switch (signal_levels) {
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_0:
		return EDP_LINK_TRAIN_400MV_0DB_IVB;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return EDP_LINK_TRAIN_400MV_3_5DB_IVB;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_6:
		return EDP_LINK_TRAIN_400MV_6DB_IVB;
 
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_0:
		return EDP_LINK_TRAIN_600MV_0DB_IVB;
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return EDP_LINK_TRAIN_600MV_3_5DB_IVB;
 
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_0:
		return EDP_LINK_TRAIN_800MV_0DB_IVB;
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return EDP_LINK_TRAIN_800MV_3_5DB_IVB;
 
	default:
		DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
			      "0x%x\n", signal_levels);
		return EDP_LINK_TRAIN_500MV_0DB_IVB;
	}
}
 
/* Gen7.5's (HSW) DP voltage swing and pre-emphasis control */
static uint32_t
intel_hsw_signal_levels(uint8_t train_set)
{
	int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
					 DP_TRAIN_PRE_EMPHASIS_MASK);
	switch (signal_levels) {
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_0:
		return DDI_BUF_EMP_400MV_0DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return DDI_BUF_EMP_400MV_3_5DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_6:
		return DDI_BUF_EMP_400MV_6DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_9_5:
		return DDI_BUF_EMP_400MV_9_5DB_HSW;
 
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_0:
		return DDI_BUF_EMP_600MV_0DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return DDI_BUF_EMP_600MV_3_5DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_6:
		return DDI_BUF_EMP_600MV_6DB_HSW;
 
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_0:
		return DDI_BUF_EMP_800MV_0DB_HSW;
	case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_3_5:
		return DDI_BUF_EMP_800MV_3_5DB_HSW;
	default:
		DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
			      "0x%x\n", signal_levels);
		return DDI_BUF_EMP_400MV_0DB_HSW;
	}
}
 
/* Properly updates "DP" with the correct signal levels. */
static void
intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	enum port port = intel_dig_port->port;
	struct drm_device *dev = intel_dig_port->base.base.dev;
	uint32_t signal_levels, mask;
	uint8_t train_set = intel_dp->train_set[0];
 
	if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
		signal_levels = intel_hsw_signal_levels(train_set);
		mask = DDI_BUF_EMP_MASK;
	} else if (IS_CHERRYVIEW(dev)) {
		signal_levels = intel_chv_signal_levels(intel_dp);
		mask = 0;
	} else if (IS_VALLEYVIEW(dev)) {
		signal_levels = intel_vlv_signal_levels(intel_dp);
		mask = 0;
	} else if (IS_GEN7(dev) && port == PORT_A) {
		signal_levels = intel_gen7_edp_signal_levels(train_set);
		mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB;
	} else if (IS_GEN6(dev) && port == PORT_A) {
		signal_levels = intel_gen6_edp_signal_levels(train_set);
		mask = EDP_LINK_TRAIN_VOL_EMP_MASK_SNB;
	} else {
		signal_levels = intel_gen4_signal_levels(train_set);
		mask = DP_VOLTAGE_MASK | DP_PRE_EMPHASIS_MASK;
	}
 
	DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels);
 
	*DP = (*DP & ~mask) | signal_levels;
}
 
static bool
intel_dp_set_link_train(struct intel_dp *intel_dp,
			uint32_t *DP,
			uint8_t dp_train_pat)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = intel_dig_port->port;
	uint8_t buf[sizeof(intel_dp->train_set) + 1];
	int ret, len;
 
	if (HAS_DDI(dev)) {
		uint32_t temp = I915_READ(DP_TP_CTL(port));
 
		if (dp_train_pat & DP_LINK_SCRAMBLING_DISABLE)
			temp |= DP_TP_CTL_SCRAMBLE_DISABLE;
		else
			temp &= ~DP_TP_CTL_SCRAMBLE_DISABLE;
 
		temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
		case DP_TRAINING_PATTERN_DISABLE:
			temp |= DP_TP_CTL_LINK_TRAIN_NORMAL;
 
			break;
		case DP_TRAINING_PATTERN_1:
			temp |= DP_TP_CTL_LINK_TRAIN_PAT1;
			break;
		case DP_TRAINING_PATTERN_2:
			temp |= DP_TP_CTL_LINK_TRAIN_PAT2;
			break;
		case DP_TRAINING_PATTERN_3:
			temp |= DP_TP_CTL_LINK_TRAIN_PAT3;
			break;
		}
		I915_WRITE(DP_TP_CTL(port), temp);
 
	} else if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) {
		*DP &= ~DP_LINK_TRAIN_MASK_CPT;
 
		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
		case DP_TRAINING_PATTERN_DISABLE:
			*DP |= DP_LINK_TRAIN_OFF_CPT;
			break;
		case DP_TRAINING_PATTERN_1:
			*DP |= DP_LINK_TRAIN_PAT_1_CPT;
			break;
		case DP_TRAINING_PATTERN_2:
			*DP |= DP_LINK_TRAIN_PAT_2_CPT;
			break;
		case DP_TRAINING_PATTERN_3:
			DRM_ERROR("DP training pattern 3 not supported\n");
			*DP |= DP_LINK_TRAIN_PAT_2_CPT;
			break;
		}
 
	} else {
		*DP &= ~DP_LINK_TRAIN_MASK;
 
		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
		case DP_TRAINING_PATTERN_DISABLE:
			*DP |= DP_LINK_TRAIN_OFF;
			break;
		case DP_TRAINING_PATTERN_1:
			*DP |= DP_LINK_TRAIN_PAT_1;
			break;
		case DP_TRAINING_PATTERN_2:
			*DP |= DP_LINK_TRAIN_PAT_2;
			break;
		case DP_TRAINING_PATTERN_3:
			DRM_ERROR("DP training pattern 3 not supported\n");
			*DP |= DP_LINK_TRAIN_PAT_2;
			break;
		}
	}
 
	I915_WRITE(intel_dp->output_reg, *DP);
	POSTING_READ(intel_dp->output_reg);
 
	buf[0] = dp_train_pat;
	if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) ==
	    DP_TRAINING_PATTERN_DISABLE) {
		/* don't write DP_TRAINING_LANEx_SET on disable */
		len = 1;
	} else {
		/* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */
		memcpy(buf + 1, intel_dp->train_set, intel_dp->lane_count);
		len = intel_dp->lane_count + 1;
	}
 
	ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET,
					buf, len);
 
	return ret == len;
}
 
static bool
intel_dp_reset_link_train(struct intel_dp *intel_dp, uint32_t *DP,
			uint8_t dp_train_pat)
{
	memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set));
	intel_dp_set_signal_levels(intel_dp, DP);
	return intel_dp_set_link_train(intel_dp, DP, dp_train_pat);
}
 
static bool
intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP,
			   const uint8_t link_status[DP_LINK_STATUS_SIZE])
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;
 
	intel_get_adjust_train(intel_dp, link_status);
	intel_dp_set_signal_levels(intel_dp, DP);
 
	I915_WRITE(intel_dp->output_reg, *DP);
	POSTING_READ(intel_dp->output_reg);
 
	ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET,
				intel_dp->train_set, intel_dp->lane_count);
 
	return ret == intel_dp->lane_count;
}
 
static void intel_dp_set_idle_link_train(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = intel_dig_port->port;
	uint32_t val;
 
	if (!HAS_DDI(dev))
		return;
 
	val = I915_READ(DP_TP_CTL(port));
	val &= ~DP_TP_CTL_LINK_TRAIN_MASK;
	val |= DP_TP_CTL_LINK_TRAIN_IDLE;
	I915_WRITE(DP_TP_CTL(port), val);
 
	/*
	 * On PORT_A we can have only eDP in SST mode. There the only reason
	 * we need to set idle transmission mode is to work around a HW issue
	 * where we enable the pipe while not in idle link-training mode.
	 * In this case there is requirement to wait for a minimum number of
	 * idle patterns to be sent.
	 */
	if (port == PORT_A)
		return;
 
	if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_IDLE_DONE),
		     1))
		DRM_ERROR("Timed out waiting for DP idle patterns\n");
}
 
/* Enable corresponding port and start training pattern 1 */
void
intel_dp_start_link_train(struct intel_dp *intel_dp)
{
	struct drm_encoder *encoder = &dp_to_dig_port(intel_dp)->base.base;
	struct drm_device *dev = encoder->dev;
	int i;
	uint8_t voltage;
	int voltage_tries, loop_tries;
	uint32_t DP = intel_dp->DP;
	uint8_t link_config[2];
 
	if (HAS_DDI(dev))
		intel_ddi_prepare_link_retrain(encoder);
 
	/* Write the link configuration data */
	link_config[0] = intel_dp->link_bw;
	link_config[1] = intel_dp->lane_count;
	if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
		link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
	drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_BW_SET, link_config, 2);
 
	link_config[0] = 0;
	link_config[1] = DP_SET_ANSI_8B10B;
	drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2);
 
	DP |= DP_PORT_EN;
 
	/* clock recovery */
	if (!intel_dp_reset_link_train(intel_dp, &DP,
				       DP_TRAINING_PATTERN_1 |
				       DP_LINK_SCRAMBLING_DISABLE)) {
		DRM_ERROR("failed to enable link training\n");
		return;
	}
 
	voltage = 0xff;
	voltage_tries = 0;
	loop_tries = 0;
	for (;;) {
		uint8_t	    link_status[DP_LINK_STATUS_SIZE];
 
		drm_dp_link_train_clock_recovery_delay(intel_dp->dpcd);
		if (!intel_dp_get_link_status(intel_dp, link_status)) {
			DRM_ERROR("failed to get link status\n");
			break;
		}
 
		if (drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) {
			DRM_DEBUG_KMS("clock recovery OK\n");
			break;
		}
 
		/* Check to see if we've tried the max voltage */
		for (i = 0; i < intel_dp->lane_count; i++)
			if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
				break;
		if (i == intel_dp->lane_count) {
			++loop_tries;
			if (loop_tries == 5) {
				DRM_ERROR("too many full retries, give up\n");
			break;
			}
			intel_dp_reset_link_train(intel_dp, &DP,
						  DP_TRAINING_PATTERN_1 |
						  DP_LINK_SCRAMBLING_DISABLE);
			voltage_tries = 0;
			continue;
		}
 
		/* Check to see if we've tried the same voltage 5 times */
		if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
			++voltage_tries;
			if (voltage_tries == 5) {
				DRM_ERROR("too many voltage retries, give up\n");
				break;
			}
		} else
			voltage_tries = 0;
		voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 
		/* Update training set as requested by target */
		if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) {
			DRM_ERROR("failed to update link training\n");
			break;
		}
	}
 
	intel_dp->DP = DP;
}
 
void
intel_dp_complete_link_train(struct intel_dp *intel_dp)
{
	bool channel_eq = false;
	int tries, cr_tries;
	uint32_t DP = intel_dp->DP;
	uint32_t training_pattern = DP_TRAINING_PATTERN_2;
 
	/* Training Pattern 3 for HBR2 ot 1.2 devices that support it*/
	if (intel_dp->link_bw == DP_LINK_BW_5_4 || intel_dp->use_tps3)
		training_pattern = DP_TRAINING_PATTERN_3;
 
	/* channel equalization */
	if (!intel_dp_set_link_train(intel_dp, &DP,
				     training_pattern |
				     DP_LINK_SCRAMBLING_DISABLE)) {
		DRM_ERROR("failed to start channel equalization\n");
		return;
	}
 
	tries = 0;
	cr_tries = 0;
	channel_eq = false;
	for (;;) {
		uint8_t	    link_status[DP_LINK_STATUS_SIZE];
 
		if (cr_tries > 5) {
			DRM_ERROR("failed to train DP, aborting\n");
			break;
		}
 
		drm_dp_link_train_channel_eq_delay(intel_dp->dpcd);
		if (!intel_dp_get_link_status(intel_dp, link_status)) {
			DRM_ERROR("failed to get link status\n");
			break;
		}
 
		/* Make sure clock is still ok */
		if (!drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) {
			intel_dp_start_link_train(intel_dp);
			intel_dp_set_link_train(intel_dp, &DP,
						training_pattern |
						DP_LINK_SCRAMBLING_DISABLE);
			cr_tries++;
			continue;
		}
 
		if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
			channel_eq = true;
			break;
		}
 
		/* Try 5 times, then try clock recovery if that fails */
		if (tries > 5) {
			intel_dp_link_down(intel_dp);
			intel_dp_start_link_train(intel_dp);
			intel_dp_set_link_train(intel_dp, &DP,
						training_pattern |
						DP_LINK_SCRAMBLING_DISABLE);
			tries = 0;
			cr_tries++;
			continue;
		}
 
		/* Update training set as requested by target */
		if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) {
			DRM_ERROR("failed to update link training\n");
			break;
		}
		++tries;
	}
 
	intel_dp_set_idle_link_train(intel_dp);
 
	intel_dp->DP = DP;
 
	if (channel_eq)
		DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n");
 
}
 
void intel_dp_stop_link_train(struct intel_dp *intel_dp)
{
	intel_dp_set_link_train(intel_dp, &intel_dp->DP,
				DP_TRAINING_PATTERN_DISABLE);
}
 
static void
intel_dp_link_down(struct intel_dp *intel_dp)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	enum port port = intel_dig_port->port;
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(intel_dig_port->base.base.crtc);
	uint32_t DP = intel_dp->DP;
 
	if (WARN_ON(HAS_DDI(dev)))
		return;
 
	if (WARN_ON((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0))
		return;
 
	DRM_DEBUG_KMS("\n");
 
	if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) {
		DP &= ~DP_LINK_TRAIN_MASK_CPT;
		I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT);
	} else {
		DP &= ~DP_LINK_TRAIN_MASK;
		I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
	}
	POSTING_READ(intel_dp->output_reg);
 
	if (HAS_PCH_IBX(dev) &&
	    I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
		struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
 
		/* Hardware workaround: leaving our transcoder select
		 * set to transcoder B while it's off will prevent the
		 * corresponding HDMI output on transcoder A.
		 *
		 * Combine this with another hardware workaround:
		 * transcoder select bit can only be cleared while the
		 * port is enabled.
		 */
		DP &= ~DP_PIPEB_SELECT;
		I915_WRITE(intel_dp->output_reg, DP);
 
		/* Changes to enable or select take place the vblank
		 * after being written.
		 */
		if (WARN_ON(crtc == NULL)) {
			/* We should never try to disable a port without a crtc
			 * attached. For paranoia keep the code around for a
			 * bit. */
			POSTING_READ(intel_dp->output_reg);
			msleep(50);
		} else
			intel_wait_for_vblank(dev, intel_crtc->pipe);
	}
 
	DP &= ~DP_AUDIO_OUTPUT_ENABLE;
	I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
	POSTING_READ(intel_dp->output_reg);
	msleep(intel_dp->panel_power_down_delay);
}
 
static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
{
	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	char dpcd_hex_dump[sizeof(intel_dp->dpcd) * 3];
 
	if (intel_dp_dpcd_read_wake(&intel_dp->aux, 0x000, intel_dp->dpcd,
				    sizeof(intel_dp->dpcd)) < 0)
		return false; /* aux transfer failed */
 
	hex_dump_to_buffer(intel_dp->dpcd, sizeof(intel_dp->dpcd),
			   32, 1, dpcd_hex_dump, sizeof(dpcd_hex_dump), false);
	DRM_DEBUG_KMS("DPCD: %s\n", dpcd_hex_dump);
 
	if (intel_dp->dpcd[DP_DPCD_REV] == 0)
		return false; /* DPCD not present */
 
	/* Check if the panel supports PSR */
	memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd));
	if (is_edp(intel_dp)) {
		intel_dp_dpcd_read_wake(&intel_dp->aux, DP_PSR_SUPPORT,
				       intel_dp->psr_dpcd,
				       sizeof(intel_dp->psr_dpcd));
		if (intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED) {
			dev_priv->psr.sink_support = true;
		DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
		}
	}
 
	/* Training Pattern 3 support */
	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x12 &&
	    intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) {
		intel_dp->use_tps3 = true;
		DRM_DEBUG_KMS("Displayport TPS3 supported");
	} else
		intel_dp->use_tps3 = false;
 
	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
	      DP_DWN_STRM_PORT_PRESENT))
		return true; /* native DP sink */
 
	if (intel_dp->dpcd[DP_DPCD_REV] == 0x10)
		return true; /* no per-port downstream info */
 
	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_DOWNSTREAM_PORT_0,
					   intel_dp->downstream_ports,
				    DP_MAX_DOWNSTREAM_PORTS) < 0)
		return false; /* downstream port status fetch failed */
 
		return true;
}
 
static void
intel_dp_probe_oui(struct intel_dp *intel_dp)
{
	u8 buf[3];
 
	if (!(intel_dp->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
		return;
 
	intel_edp_panel_vdd_on(intel_dp);
 
	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_OUI, buf, 3) == 3)
		DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
			      buf[0], buf[1], buf[2]);
 
	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_BRANCH_OUI, buf, 3) == 3)
		DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
			      buf[0], buf[1], buf[2]);
 
	edp_panel_vdd_off(intel_dp, false);
}
 
static bool
intel_dp_probe_mst(struct intel_dp *intel_dp)
{
	u8 buf[1];
 
	if (!intel_dp->can_mst)
		return false;
 
	if (intel_dp->dpcd[DP_DPCD_REV] < 0x12)
		return false;
 
	_edp_panel_vdd_on(intel_dp);
	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_MSTM_CAP, buf, 1)) {
		if (buf[0] & DP_MST_CAP) {
			DRM_DEBUG_KMS("Sink is MST capable\n");
			intel_dp->is_mst = true;
		} else {
			DRM_DEBUG_KMS("Sink is not MST capable\n");
			intel_dp->is_mst = false;
		}
	}
	edp_panel_vdd_off(intel_dp, false);
 
	drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
	return intel_dp->is_mst;
}
 
int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
{
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(intel_dig_port->base.base.crtc);
	u8 buf[1];
 
	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, buf) < 0)
		return -EAGAIN;
 
	if (!(buf[0] & DP_TEST_CRC_SUPPORTED))
		return -ENOTTY;
 
	if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
			       DP_TEST_SINK_START) < 0)
		return -EAGAIN;
 
	/* Wait 2 vblanks to be sure we will have the correct CRC value */
	intel_wait_for_vblank(dev, intel_crtc->pipe);
	intel_wait_for_vblank(dev, intel_crtc->pipe);
 
	if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0)
		return -EAGAIN;
 
	drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, 0);
	return 0;
}
 
static bool
intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
	return intel_dp_dpcd_read_wake(&intel_dp->aux,
					     DP_DEVICE_SERVICE_IRQ_VECTOR,
				       sink_irq_vector, 1) == 1;
}
 
static bool
intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
	int ret;
 
	ret = intel_dp_dpcd_read_wake(&intel_dp->aux,
					     DP_SINK_COUNT_ESI,
					     sink_irq_vector, 14);
	if (ret != 14)
		return false;
 
	return true;
}
 
static void
intel_dp_handle_test_request(struct intel_dp *intel_dp)
{
	/* NAK by default */
	drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, DP_TEST_NAK);
}
 
static int
intel_dp_check_mst_status(struct intel_dp *intel_dp)
{
	bool bret;
 
	if (intel_dp->is_mst) {
		u8 esi[16] = { 0 };
		int ret = 0;
		int retry;
		bool handled;
		bret = intel_dp_get_sink_irq_esi(intel_dp, esi);
go_again:
		if (bret == true) {
 
			/* check link status - esi[10] = 0x200c */
			if (intel_dp->active_mst_links && !drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) {
				DRM_DEBUG_KMS("channel EQ not ok, retraining\n");
				intel_dp_start_link_train(intel_dp);
				intel_dp_complete_link_train(intel_dp);
				intel_dp_stop_link_train(intel_dp);
			}
 
			DRM_DEBUG_KMS("got esi %02x %02x %02x\n", esi[0], esi[1], esi[2]);
			ret = drm_dp_mst_hpd_irq(&intel_dp->mst_mgr, esi, &handled);
 
			if (handled) {
				for (retry = 0; retry < 3; retry++) {
					int wret;
					wret = drm_dp_dpcd_write(&intel_dp->aux,
								 DP_SINK_COUNT_ESI+1,
								 &esi[1], 3);
					if (wret == 3) {
						break;
					}
				}
 
				bret = intel_dp_get_sink_irq_esi(intel_dp, esi);
				if (bret == true) {
					DRM_DEBUG_KMS("got esi2 %02x %02x %02x\n", esi[0], esi[1], esi[2]);
					goto go_again;
				}
			} else
				ret = 0;
 
			return ret;
		} else {
			struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
			DRM_DEBUG_KMS("failed to get ESI - device may have failed\n");
			intel_dp->is_mst = false;
			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
			/* send a hotplug event */
			drm_kms_helper_hotplug_event(intel_dig_port->base.base.dev);
		}
	}
	return -EINVAL;
}
 
/*
 * According to DP spec
 * 5.1.2:
 *  1. Read DPCD
 *  2. Configure link according to Receiver Capabilities
 *  3. Use Link Training from 2.5.3.3 and 3.5.1.3
 *  4. Check link status on receipt of hot-plug interrupt
 */
void
intel_dp_check_link_status(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
	u8 sink_irq_vector;
	u8 link_status[DP_LINK_STATUS_SIZE];
 
	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 
	if (!intel_encoder->connectors_active)
		return;
 
	if (WARN_ON(!intel_encoder->base.crtc))
		return;
 
	if (!to_intel_crtc(intel_encoder->base.crtc)->active)
		return;
 
	/* Try to read receiver status if the link appears to be up */
	if (!intel_dp_get_link_status(intel_dp, link_status)) {
		return;
	}
 
	/* Now read the DPCD to see if it's actually running */
	if (!intel_dp_get_dpcd(intel_dp)) {
		return;
	}
 
	/* Try to read the source of the interrupt */
	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
	    intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) {
		/* Clear interrupt source */
		drm_dp_dpcd_writeb(&intel_dp->aux,
					    DP_DEVICE_SERVICE_IRQ_VECTOR,
					    sink_irq_vector);
 
		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
			intel_dp_handle_test_request(intel_dp);
		if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ))
			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
	}
 
	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
		DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
			      intel_encoder->base.name);
		intel_dp_start_link_train(intel_dp);
		intel_dp_complete_link_train(intel_dp);
		intel_dp_stop_link_train(intel_dp);
	}
}
 
/* XXX this is probably wrong for multiple downstream ports */
static enum drm_connector_status
intel_dp_detect_dpcd(struct intel_dp *intel_dp)
{
	uint8_t *dpcd = intel_dp->dpcd;
	uint8_t type;
 
	if (!intel_dp_get_dpcd(intel_dp))
		return connector_status_disconnected;
 
	/* if there's no downstream port, we're done */
	if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
		return connector_status_connected;
 
	/* If we're HPD-aware, SINK_COUNT changes dynamically */
	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
	    intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
		uint8_t reg;
 
		if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT,
					    ®, 1) < 0)
			return connector_status_unknown;
 
		return DP_GET_SINK_COUNT(reg) ? connector_status_connected
					      : connector_status_disconnected;
	}
 
	/* If no HPD, poke DDC gently */
	if (drm_probe_ddc(&intel_dp->aux.ddc))
		return connector_status_connected;
 
	/* Well we tried, say unknown for unreliable port types */
	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
	type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
		if (type == DP_DS_PORT_TYPE_VGA ||
		    type == DP_DS_PORT_TYPE_NON_EDID)
		return connector_status_unknown;
	} else {
		type = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
			DP_DWN_STRM_PORT_TYPE_MASK;
		if (type == DP_DWN_STRM_PORT_TYPE_ANALOG ||
		    type == DP_DWN_STRM_PORT_TYPE_OTHER)
			return connector_status_unknown;
	}
 
	/* Anything else is out of spec, warn and ignore */
	DRM_DEBUG_KMS("Broken DP branch device, ignoring\n");
	return connector_status_disconnected;
}
 
static enum drm_connector_status
ironlake_dp_detect(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	enum drm_connector_status status;
 
	/* Can't disconnect eDP, but you can close the lid... */
	if (is_edp(intel_dp)) {
		status = intel_panel_detect(dev);
		if (status == connector_status_unknown)
			status = connector_status_connected;
		return status;
	}
 
	if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
		return connector_status_disconnected;
 
	return intel_dp_detect_dpcd(intel_dp);
}
 
static int g4x_digital_port_connected(struct drm_device *dev,
				       struct intel_digital_port *intel_dig_port)
 
{
 
	struct drm_i915_private *dev_priv = dev->dev_private;
 
 
 
 
 
 
 
 
 
 
	uint32_t bit;
 
	if (IS_VALLEYVIEW(dev)) {
		switch (intel_dig_port->port) {
		case PORT_B:
			bit = PORTB_HOTPLUG_LIVE_STATUS_VLV;
			break;
		case PORT_C:
			bit = PORTC_HOTPLUG_LIVE_STATUS_VLV;
			break;
		case PORT_D:
			bit = PORTD_HOTPLUG_LIVE_STATUS_VLV;
			break;
		default:
			return -EINVAL;
		}
	} else {
	switch (intel_dig_port->port) {
	case PORT_B:
			bit = PORTB_HOTPLUG_LIVE_STATUS_G4X;
		break;
	case PORT_C:
			bit = PORTC_HOTPLUG_LIVE_STATUS_G4X;
		break;
	case PORT_D:
			bit = PORTD_HOTPLUG_LIVE_STATUS_G4X;
		break;
	default:
			return -EINVAL;
	}
	}
 
	if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
		return 0;
	return 1;
}
 
static enum drm_connector_status
g4x_dp_detect(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	int ret;
 
	/* Can't disconnect eDP, but you can close the lid... */
	if (is_edp(intel_dp)) {
		enum drm_connector_status status;
 
		status = intel_panel_detect(dev);
		if (status == connector_status_unknown)
			status = connector_status_connected;
		return status;
	}
 
	ret = g4x_digital_port_connected(dev, intel_dig_port);
	if (ret == -EINVAL)
		return connector_status_unknown;
	else if (ret == 0)
		return connector_status_disconnected;
 
	return intel_dp_detect_dpcd(intel_dp);
}
 
static struct edid *
intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
{
	struct intel_connector *intel_connector = to_intel_connector(connector);
 
	/* use cached edid if we have one */
	if (intel_connector->edid) {
		/* invalid edid */
		if (IS_ERR(intel_connector->edid))
			return NULL;
 
		return drm_edid_duplicate(intel_connector->edid);
	}
 
	return drm_get_edid(connector, adapter);
}
 
static int
intel_dp_get_edid_modes(struct drm_connector *connector, struct i2c_adapter *adapter)
{
	struct intel_connector *intel_connector = to_intel_connector(connector);
 
	/* use cached edid if we have one */
	if (intel_connector->edid) {
		/* invalid edid */
		if (IS_ERR(intel_connector->edid))
			return 0;
 
		return intel_connector_update_modes(connector,
						    intel_connector->edid);
	}
 
	return intel_ddc_get_modes(connector, adapter);
}
 
static enum drm_connector_status
intel_dp_detect(struct drm_connector *connector, bool force)
{
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum drm_connector_status status;
	enum intel_display_power_domain power_domain;
	struct edid *edid = NULL;
	bool ret;
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
		      connector->base.id, connector->name);
 
	if (intel_dp->is_mst) {
		/* MST devices are disconnected from a monitor POV */
		if (intel_encoder->type != INTEL_OUTPUT_EDP)
			intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
		status = connector_status_disconnected;
		goto out;
	}
 
	intel_dp->has_audio = false;
 
	if (HAS_PCH_SPLIT(dev))
		status = ironlake_dp_detect(intel_dp);
	else
		status = g4x_dp_detect(intel_dp);
 
	if (status != connector_status_connected)
		goto out;
 
	intel_dp_probe_oui(intel_dp);
 
	ret = intel_dp_probe_mst(intel_dp);
	if (ret) {
		/* if we are in MST mode then this connector
		   won't appear connected or have anything with EDID on it */
		if (intel_encoder->type != INTEL_OUTPUT_EDP)
			intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
		status = connector_status_disconnected;
		goto out;
	}
 
	if (intel_dp->force_audio != HDMI_AUDIO_AUTO) {
		intel_dp->has_audio = (intel_dp->force_audio == HDMI_AUDIO_ON);
	} else {
		edid = intel_dp_get_edid(connector, &intel_dp->aux.ddc);
		if (edid) {
			intel_dp->has_audio = drm_detect_monitor_audio(edid);
			kfree(edid);
		}
	}
 
	if (intel_encoder->type != INTEL_OUTPUT_EDP)
		intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
	status = connector_status_connected;
 
out:
	intel_display_power_put(dev_priv, power_domain);
	return status;
}
 
static int intel_dp_get_modes(struct drm_connector *connector)
{
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct intel_connector *intel_connector = to_intel_connector(connector);
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	int ret;
 
	/* We should parse the EDID data and find out if it has an audio sink
	 */
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	ret = intel_dp_get_edid_modes(connector, &intel_dp->aux.ddc);
	intel_display_power_put(dev_priv, power_domain);
	if (ret)
		return ret;
 
	/* if eDP has no EDID, fall back to fixed mode */
	if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
			struct drm_display_mode *mode;
		mode = drm_mode_duplicate(dev,
					  intel_connector->panel.fixed_mode);
		if (mode) {
			drm_mode_probed_add(connector, mode);
			return 1;
		}
	}
	return 0;
}
 
static bool
intel_dp_detect_audio(struct drm_connector *connector)
{
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	struct edid *edid;
	bool has_audio = false;
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	edid = intel_dp_get_edid(connector, &intel_dp->aux.ddc);
	if (edid) {
		has_audio = drm_detect_monitor_audio(edid);
		kfree(edid);
	}
 
	intel_display_power_put(dev_priv, power_domain);
 
	return has_audio;
}
 
static int
intel_dp_set_property(struct drm_connector *connector,
		      struct drm_property *property,
		      uint64_t val)
{
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	struct intel_connector *intel_connector = to_intel_connector(connector);
	struct intel_encoder *intel_encoder = intel_attached_encoder(connector);
	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
	int ret;
 
	ret = drm_object_property_set_value(&connector->base, property, val);
	if (ret)
		return ret;
 
	if (property == dev_priv->force_audio_property) {
		int i = val;
		bool has_audio;
 
		if (i == intel_dp->force_audio)
			return 0;
 
		intel_dp->force_audio = i;
 
		if (i == HDMI_AUDIO_AUTO)
			has_audio = intel_dp_detect_audio(connector);
		else
			has_audio = (i == HDMI_AUDIO_ON);
 
		if (has_audio == intel_dp->has_audio)
			return 0;
 
		intel_dp->has_audio = has_audio;
		goto done;
	}
 
	if (property == dev_priv->broadcast_rgb_property) {
		bool old_auto = intel_dp->color_range_auto;
		uint32_t old_range = intel_dp->color_range;
 
		switch (val) {
		case INTEL_BROADCAST_RGB_AUTO:
			intel_dp->color_range_auto = true;
			break;
		case INTEL_BROADCAST_RGB_FULL:
			intel_dp->color_range_auto = false;
			intel_dp->color_range = 0;
			break;
		case INTEL_BROADCAST_RGB_LIMITED:
			intel_dp->color_range_auto = false;
			intel_dp->color_range = DP_COLOR_RANGE_16_235;
			break;
		default:
			return -EINVAL;
		}
 
		if (old_auto == intel_dp->color_range_auto &&
		    old_range == intel_dp->color_range)
			return 0;
 
	goto done;
	}
 
	if (is_edp(intel_dp) &&
	    property == connector->dev->mode_config.scaling_mode_property) {
		if (val == DRM_MODE_SCALE_NONE) {
			DRM_DEBUG_KMS("no scaling not supported\n");
			return -EINVAL;
		}
 
		if (intel_connector->panel.fitting_mode == val) {
			/* the eDP scaling property is not changed */
			return 0;
		}
		intel_connector->panel.fitting_mode = val;
 
		goto done;
	}
 
	return -EINVAL;
 
done:
	if (intel_encoder->base.crtc)
		intel_crtc_restore_mode(intel_encoder->base.crtc);
 
	return 0;
}
 
static void
intel_dp_connector_destroy(struct drm_connector *connector)
{
	struct intel_connector *intel_connector = to_intel_connector(connector);
 
	if (!IS_ERR_OR_NULL(intel_connector->edid))
		kfree(intel_connector->edid);
 
	/* Can't call is_edp() since the encoder may have been destroyed
	 * already. */
	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
		intel_panel_fini(&intel_connector->panel);
 
	drm_connector_cleanup(connector);
	kfree(connector);
}
 
void intel_dp_encoder_destroy(struct drm_encoder *encoder)
{
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	struct intel_dp *intel_dp = &intel_dig_port->dp;
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
	drm_dp_aux_unregister(&intel_dp->aux);
	intel_dp_mst_encoder_cleanup(intel_dig_port);
	drm_encoder_cleanup(encoder);
	if (is_edp(intel_dp)) {
		cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
		drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
		edp_panel_vdd_off_sync(intel_dp);
		drm_modeset_unlock(&dev->mode_config.connection_mutex);
	}
	kfree(intel_dig_port);
}
 
static void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
	if (!is_edp(intel_dp))
		return;
 
	edp_panel_vdd_off_sync(intel_dp);
}
 
static void intel_dp_encoder_reset(struct drm_encoder *encoder)
{
	intel_edp_panel_vdd_sanitize(to_intel_encoder(encoder));
}
 
static const struct drm_connector_funcs intel_dp_connector_funcs = {
	.dpms = intel_connector_dpms,
	.detect = intel_dp_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.set_property = intel_dp_set_property,
	.destroy = intel_dp_connector_destroy,
};
 
static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs = {
	.get_modes = intel_dp_get_modes,
	.mode_valid = intel_dp_mode_valid,
	.best_encoder = intel_best_encoder,
};
 
static const struct drm_encoder_funcs intel_dp_enc_funcs = {
	.reset = intel_dp_encoder_reset,
	.destroy = intel_dp_encoder_destroy,
};
 
void
intel_dp_hot_plug(struct intel_encoder *intel_encoder)
{
	return;
}
 
bool
intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
{
	struct intel_dp *intel_dp = &intel_dig_port->dp;
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum intel_display_power_domain power_domain;
	bool ret = true;
 
	if (intel_dig_port->base.type != INTEL_OUTPUT_EDP)
		intel_dig_port->base.type = INTEL_OUTPUT_DISPLAYPORT;
 
	DRM_DEBUG_KMS("got hpd irq on port %d - %s\n", intel_dig_port->port,
		      long_hpd ? "long" : "short");
 
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	if (long_hpd) {
 
		if (HAS_PCH_SPLIT(dev)) {
		if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
			goto mst_fail;
		} else {
			if (g4x_digital_port_connected(dev, intel_dig_port) != 1)
				goto mst_fail;
		}
 
		if (!intel_dp_get_dpcd(intel_dp)) {
			goto mst_fail;
		}
 
		intel_dp_probe_oui(intel_dp);
 
		if (!intel_dp_probe_mst(intel_dp))
			goto mst_fail;
 
	} else {
		if (intel_dp->is_mst) {
			if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
				goto mst_fail;
		}
 
		if (!intel_dp->is_mst) {
			/*
			 * we'll check the link status via the normal hot plug path later -
			 * but for short hpds we should check it now
			 */
			drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
			intel_dp_check_link_status(intel_dp);
			drm_modeset_unlock(&dev->mode_config.connection_mutex);
		}
	}
	ret = false;
	goto put_power;
mst_fail:
	/* if we were in MST mode, and device is not there get out of MST mode */
	if (intel_dp->is_mst) {
		DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n", intel_dp->is_mst, intel_dp->mst_mgr.mst_state);
		intel_dp->is_mst = false;
		drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
	}
put_power:
	intel_display_power_put(dev_priv, power_domain);
 
	return ret;
}
 
/* Return which DP Port should be selected for Transcoder DP control */
int
intel_trans_dp_port_sel(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct intel_encoder *intel_encoder;
	struct intel_dp *intel_dp;
 
	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
		if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
		    intel_encoder->type == INTEL_OUTPUT_EDP)
			return intel_dp->output_reg;
	}
 
	return -1;
}
 
/* check the VBT to see whether the eDP is on DP-D port */
bool intel_dp_is_edp(struct drm_device *dev, enum port port)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	union child_device_config *p_child;
	int i;
	static const short port_mapping[] = {
		[PORT_B] = PORT_IDPB,
		[PORT_C] = PORT_IDPC,
		[PORT_D] = PORT_IDPD,
	};
 
	if (port == PORT_A)
		return true;
 
	if (!dev_priv->vbt.child_dev_num)
		return false;
 
	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
		p_child = dev_priv->vbt.child_dev + i;
 
		if (p_child->common.dvo_port == port_mapping[port] &&
		    (p_child->common.device_type & DEVICE_TYPE_eDP_BITS) ==
		    (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
			return true;
	}
	return false;
}
 
void
intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector)
{
	struct intel_connector *intel_connector = to_intel_connector(connector);
 
	intel_attach_force_audio_property(connector);
	intel_attach_broadcast_rgb_property(connector);
	intel_dp->color_range_auto = true;
 
	if (is_edp(intel_dp)) {
		drm_mode_create_scaling_mode_property(connector->dev);
		drm_object_attach_property(
			&connector->base,
			connector->dev->mode_config.scaling_mode_property,
			DRM_MODE_SCALE_ASPECT);
		intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
	}
}
 
static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
{
	intel_dp->last_power_cycle = jiffies;
	intel_dp->last_power_on = jiffies;
	intel_dp->last_backlight_off = jiffies;
}
 
static void
intel_dp_init_panel_power_sequencer(struct drm_device *dev,
				    struct intel_dp *intel_dp,
				    struct edp_power_seq *out)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct edp_power_seq cur, vbt, spec, final;
	u32 pp_on, pp_off, pp_div, pp;
	int pp_ctrl_reg, pp_on_reg, pp_off_reg, pp_div_reg;
 
	if (HAS_PCH_SPLIT(dev)) {
		pp_ctrl_reg = PCH_PP_CONTROL;
		pp_on_reg = PCH_PP_ON_DELAYS;
		pp_off_reg = PCH_PP_OFF_DELAYS;
		pp_div_reg = PCH_PP_DIVISOR;
	} else {
		enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
 
		pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe);
		pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe);
		pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe);
		pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
	}
 
	/* Workaround: Need to write PP_CONTROL with the unlock key as
	 * the very first thing. */
	pp = ironlake_get_pp_control(intel_dp);
	I915_WRITE(pp_ctrl_reg, pp);
 
	pp_on = I915_READ(pp_on_reg);
	pp_off = I915_READ(pp_off_reg);
	pp_div = I915_READ(pp_div_reg);
 
	/* Pull timing values out of registers */
	cur.t1_t3 = (pp_on & PANEL_POWER_UP_DELAY_MASK) >>
		PANEL_POWER_UP_DELAY_SHIFT;
 
	cur.t8 = (pp_on & PANEL_LIGHT_ON_DELAY_MASK) >>
		PANEL_LIGHT_ON_DELAY_SHIFT;
 
	cur.t9 = (pp_off & PANEL_LIGHT_OFF_DELAY_MASK) >>
		PANEL_LIGHT_OFF_DELAY_SHIFT;
 
	cur.t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >>
		PANEL_POWER_DOWN_DELAY_SHIFT;
 
	cur.t11_t12 = ((pp_div & PANEL_POWER_CYCLE_DELAY_MASK) >>
		       PANEL_POWER_CYCLE_DELAY_SHIFT) * 1000;
 
	DRM_DEBUG_KMS("cur t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
		      cur.t1_t3, cur.t8, cur.t9, cur.t10, cur.t11_t12);
 
	vbt = dev_priv->vbt.edp_pps;
 
	/* Upper limits from eDP 1.3 spec. Note that we use the clunky units of
	 * our hw here, which are all in 100usec. */
	spec.t1_t3 = 210 * 10;
	spec.t8 = 50 * 10; /* no limit for t8, use t7 instead */
	spec.t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */
	spec.t10 = 500 * 10;
	/* This one is special and actually in units of 100ms, but zero
	 * based in the hw (so we need to add 100 ms). But the sw vbt
	 * table multiplies it with 1000 to make it in units of 100usec,
	 * too. */
	spec.t11_t12 = (510 + 100) * 10;
 
	DRM_DEBUG_KMS("vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
		      vbt.t1_t3, vbt.t8, vbt.t9, vbt.t10, vbt.t11_t12);
 
	/* Use the max of the register settings and vbt. If both are
	 * unset, fall back to the spec limits. */
#define assign_final(field)	final.field = (max(cur.field, vbt.field) == 0 ? \
				       spec.field : \
				       max(cur.field, vbt.field))
	assign_final(t1_t3);
	assign_final(t8);
	assign_final(t9);
	assign_final(t10);
	assign_final(t11_t12);
#undef assign_final
 
#define get_delay(field)	(DIV_ROUND_UP(final.field, 10))
	intel_dp->panel_power_up_delay = get_delay(t1_t3);
	intel_dp->backlight_on_delay = get_delay(t8);
	intel_dp->backlight_off_delay = get_delay(t9);
	intel_dp->panel_power_down_delay = get_delay(t10);
	intel_dp->panel_power_cycle_delay = get_delay(t11_t12);
#undef get_delay
 
	DRM_DEBUG_KMS("panel power up delay %d, power down delay %d, power cycle delay %d\n",
		      intel_dp->panel_power_up_delay, intel_dp->panel_power_down_delay,
		      intel_dp->panel_power_cycle_delay);
 
	DRM_DEBUG_KMS("backlight on delay %d, off delay %d\n",
		      intel_dp->backlight_on_delay, intel_dp->backlight_off_delay);
 
	if (out)
		*out = final;
}
 
static void
intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
					      struct intel_dp *intel_dp,
					      struct edp_power_seq *seq)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp_on, pp_off, pp_div, port_sel = 0;
	int div = HAS_PCH_SPLIT(dev) ? intel_pch_rawclk(dev) : intel_hrawclk(dev);
	int pp_on_reg, pp_off_reg, pp_div_reg;
 
	if (HAS_PCH_SPLIT(dev)) {
		pp_on_reg = PCH_PP_ON_DELAYS;
		pp_off_reg = PCH_PP_OFF_DELAYS;
		pp_div_reg = PCH_PP_DIVISOR;
	} else {
		enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
 
		pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe);
		pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe);
		pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
	}
 
	/*
	 * And finally store the new values in the power sequencer. The
	 * backlight delays are set to 1 because we do manual waits on them. For
	 * T8, even BSpec recommends doing it. For T9, if we don't do this,
	 * we'll end up waiting for the backlight off delay twice: once when we
	 * do the manual sleep, and once when we disable the panel and wait for
	 * the PP_STATUS bit to become zero.
	 */
	pp_on = (seq->t1_t3 << PANEL_POWER_UP_DELAY_SHIFT) |
		(1 << PANEL_LIGHT_ON_DELAY_SHIFT);
	pp_off = (1 << PANEL_LIGHT_OFF_DELAY_SHIFT) |
		 (seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT);
	/* Compute the divisor for the pp clock, simply match the Bspec
	 * formula. */
	pp_div = ((100 * div)/2 - 1) << PP_REFERENCE_DIVIDER_SHIFT;
	pp_div |= (DIV_ROUND_UP(seq->t11_t12, 1000)
			<< PANEL_POWER_CYCLE_DELAY_SHIFT);
 
	/* Haswell doesn't have any port selection bits for the panel
	 * power sequencer any more. */
	if (IS_VALLEYVIEW(dev)) {
		if (dp_to_dig_port(intel_dp)->port == PORT_B)
			port_sel = PANEL_PORT_SELECT_DPB_VLV;
		else
			port_sel = PANEL_PORT_SELECT_DPC_VLV;
	} else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) {
		if (dp_to_dig_port(intel_dp)->port == PORT_A)
			port_sel = PANEL_PORT_SELECT_DPA;
		else
			port_sel = PANEL_PORT_SELECT_DPD;
	}
 
	pp_on |= port_sel;
 
	I915_WRITE(pp_on_reg, pp_on);
	I915_WRITE(pp_off_reg, pp_off);
	I915_WRITE(pp_div_reg, pp_div);
 
	DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
		      I915_READ(pp_on_reg),
		      I915_READ(pp_off_reg),
		      I915_READ(pp_div_reg));
}
 
void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *encoder;
	struct intel_dp *intel_dp = NULL;
	struct intel_crtc_config *config = NULL;
	struct intel_crtc *intel_crtc = NULL;
	struct intel_connector *intel_connector = dev_priv->drrs.connector;
	u32 reg, val;
	enum edp_drrs_refresh_rate_type index = DRRS_HIGH_RR;
 
	if (refresh_rate <= 0) {
		DRM_DEBUG_KMS("Refresh rate should be positive non-zero.\n");
		return;
	}
 
	if (intel_connector == NULL) {
		DRM_DEBUG_KMS("DRRS supported for eDP only.\n");
		return;
	}
 
	/*
	 * FIXME: This needs proper synchronization with psr state. But really
	 * hard to tell without seeing the user of this function of this code.
	 * Check locking and ordering once that lands.
	 */
	if (INTEL_INFO(dev)->gen < 8 && intel_edp_is_psr_enabled(dev)) {
		DRM_DEBUG_KMS("DRRS is disabled as PSR is enabled\n");
		return;
	}
 
	encoder = intel_attached_encoder(&intel_connector->base);
	intel_dp = enc_to_intel_dp(&encoder->base);
	intel_crtc = encoder->new_crtc;
 
	if (!intel_crtc) {
		DRM_DEBUG_KMS("DRRS: intel_crtc not initialized\n");
		return;
	}
 
	config = &intel_crtc->config;
 
	if (intel_dp->drrs_state.type < SEAMLESS_DRRS_SUPPORT) {
		DRM_DEBUG_KMS("Only Seamless DRRS supported.\n");
		return;
	}
 
	if (intel_connector->panel.downclock_mode->vrefresh == refresh_rate)
		index = DRRS_LOW_RR;
 
	if (index == intel_dp->drrs_state.refresh_rate_type) {
		DRM_DEBUG_KMS(
			"DRRS requested for previously set RR...ignoring\n");
		return;
	}
 
	if (!intel_crtc->active) {
		DRM_DEBUG_KMS("eDP encoder disabled. CRTC not Active\n");
		return;
	}
 
	if (INTEL_INFO(dev)->gen > 6 && INTEL_INFO(dev)->gen < 8) {
		reg = PIPECONF(intel_crtc->config.cpu_transcoder);
		val = I915_READ(reg);
		if (index > DRRS_HIGH_RR) {
			val |= PIPECONF_EDP_RR_MODE_SWITCH;
			intel_dp_set_m2_n2(intel_crtc, &config->dp_m2_n2);
		} else {
			val &= ~PIPECONF_EDP_RR_MODE_SWITCH;
		}
		I915_WRITE(reg, val);
	}
 
	/*
	 * mutex taken to ensure that there is no race between differnt
	 * drrs calls trying to update refresh rate. This scenario may occur
	 * in future when idleness detection based DRRS in kernel and
	 * possible calls from user space to set differnt RR are made.
	 */
 
	mutex_lock(&intel_dp->drrs_state.mutex);
 
	intel_dp->drrs_state.refresh_rate_type = index;
 
	mutex_unlock(&intel_dp->drrs_state.mutex);
 
	DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
}
 
static struct drm_display_mode *
intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
			struct intel_connector *intel_connector,
			struct drm_display_mode *fixed_mode)
{
	struct drm_connector *connector = &intel_connector->base;
	struct intel_dp *intel_dp = &intel_dig_port->dp;
	struct drm_device *dev = intel_dig_port->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_display_mode *downclock_mode = NULL;
 
	if (INTEL_INFO(dev)->gen <= 6) {
		DRM_DEBUG_KMS("DRRS supported for Gen7 and above\n");
		return NULL;
	}
 
	if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) {
		DRM_INFO("VBT doesn't support DRRS\n");
		return NULL;
	}
 
	downclock_mode = intel_find_panel_downclock
					(dev, fixed_mode, connector);
 
	if (!downclock_mode) {
		DRM_INFO("DRRS not supported\n");
		return NULL;
	}
 
	dev_priv->drrs.connector = intel_connector;
 
	mutex_init(&intel_dp->drrs_state.mutex);
 
	intel_dp->drrs_state.type = dev_priv->vbt.drrs_type;
 
	intel_dp->drrs_state.refresh_rate_type = DRRS_HIGH_RR;
	DRM_INFO("seamless DRRS supported for eDP panel.\n");
	return downclock_mode;
}
 
void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder)
{
	struct drm_device *dev = intel_encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp *intel_dp;
	enum intel_display_power_domain power_domain;
 
	if (intel_encoder->type != INTEL_OUTPUT_EDP)
		return;
 
	intel_dp = enc_to_intel_dp(&intel_encoder->base);
	if (!edp_have_panel_vdd(intel_dp))
		return;
	/*
	 * The VDD bit needs a power domain reference, so if the bit is
	 * already enabled when we boot or resume, grab this reference and
	 * schedule a vdd off, so we don't hold on to the reference
	 * indefinitely.
	 */
	DRM_DEBUG_KMS("VDD left on by BIOS, adjusting state tracking\n");
	power_domain = intel_display_port_power_domain(intel_encoder);
	intel_display_power_get(dev_priv, power_domain);
 
	edp_panel_vdd_schedule_off(intel_dp);
}
 
static bool intel_edp_init_connector(struct intel_dp *intel_dp,
				     struct intel_connector *intel_connector,
				     struct edp_power_seq *power_seq)
{
	struct drm_connector *connector = &intel_connector->base;
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = intel_encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_display_mode *fixed_mode = NULL;
	struct drm_display_mode *downclock_mode = NULL;
	bool has_dpcd;
	struct drm_display_mode *scan;
	struct edid *edid;
 
	intel_dp->drrs_state.type = DRRS_NOT_SUPPORTED;
 
	if (!is_edp(intel_dp))
		return true;
 
	intel_edp_panel_vdd_sanitize(intel_encoder);
 
	/* Cache DPCD and EDID for edp. */
	intel_edp_panel_vdd_on(intel_dp);
	has_dpcd = intel_dp_get_dpcd(intel_dp);
	edp_panel_vdd_off(intel_dp, false);
 
	if (has_dpcd) {
		if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11)
			dev_priv->no_aux_handshake =
				intel_dp->dpcd[DP_MAX_DOWNSPREAD] &
				DP_NO_AUX_HANDSHAKE_LINK_TRAINING;
	} else {
		/* if this fails, presume the device is a ghost */
		DRM_INFO("failed to retrieve link info, disabling eDP\n");
		return false;
	}
 
	/* We now know it's not a ghost, init power sequence regs. */
	intel_dp_init_panel_power_sequencer_registers(dev, intel_dp, power_seq);
 
	mutex_lock(&dev->mode_config.mutex);
	edid = drm_get_edid(connector, &intel_dp->aux.ddc);
	if (edid) {
		if (drm_add_edid_modes(connector, edid)) {
			drm_mode_connector_update_edid_property(connector,
								edid);
			drm_edid_to_eld(connector, edid);
		} else {
			kfree(edid);
			edid = ERR_PTR(-EINVAL);
		}
	} else {
		edid = ERR_PTR(-ENOENT);
	}
	intel_connector->edid = edid;
 
	/* prefer fixed mode from EDID if available */
	list_for_each_entry(scan, &connector->probed_modes, head) {
		if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
			fixed_mode = drm_mode_duplicate(dev, scan);
			downclock_mode = intel_dp_drrs_init(
						intel_dig_port,
						intel_connector, fixed_mode);
			break;
		}
	}
 
	/* fallback to VBT if available for eDP */
	if (!fixed_mode && dev_priv->vbt.lfp_lvds_vbt_mode) {
		fixed_mode = drm_mode_duplicate(dev,
					dev_priv->vbt.lfp_lvds_vbt_mode);
		if (fixed_mode)
			fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
	}
	mutex_unlock(&dev->mode_config.mutex);
 
	intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
	intel_panel_setup_backlight(connector);
 
	return true;
}
 
bool
intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
			struct intel_connector *intel_connector)
{
	struct drm_connector *connector = &intel_connector->base;
	struct intel_dp *intel_dp = &intel_dig_port->dp;
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = intel_encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = intel_dig_port->port;
	struct edp_power_seq power_seq = { 0 };
	int type;
 
	/* intel_dp vfuncs */
	if (IS_VALLEYVIEW(dev))
		intel_dp->get_aux_clock_divider = vlv_get_aux_clock_divider;
	else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
		intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
	else if (HAS_PCH_SPLIT(dev))
		intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
	else
		intel_dp->get_aux_clock_divider = i9xx_get_aux_clock_divider;
 
	intel_dp->get_aux_send_ctl = i9xx_get_aux_send_ctl;
 
	/* Preserve the current hw state. */
	intel_dp->DP = I915_READ(intel_dp->output_reg);
	intel_dp->attached_connector = intel_connector;
 
	if (intel_dp_is_edp(dev, port))
		type = DRM_MODE_CONNECTOR_eDP;
	else
	type = DRM_MODE_CONNECTOR_DisplayPort;
 
	/*
	 * For eDP we always set the encoder type to INTEL_OUTPUT_EDP, but
	 * for DP the encoder type can be set by the caller to
	 * INTEL_OUTPUT_UNKNOWN for DDI, so don't rewrite it.
	 */
	if (type == DRM_MODE_CONNECTOR_eDP)
		intel_encoder->type = INTEL_OUTPUT_EDP;
 
	DRM_DEBUG_KMS("Adding %s connector on port %c\n",
			type == DRM_MODE_CONNECTOR_eDP ? "eDP" : "DP",
			port_name(port));
 
	drm_connector_init(dev, connector, &intel_dp_connector_funcs, type);
	drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
 
	connector->interlace_allowed = true;
	connector->doublescan_allowed = 0;
 
	INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
			  edp_panel_vdd_work);
 
	intel_connector_attach_encoder(intel_connector, intel_encoder);
	drm_connector_register(connector);
 
	if (HAS_DDI(dev))
		intel_connector->get_hw_state = intel_ddi_connector_get_hw_state;
	else
	intel_connector->get_hw_state = intel_connector_get_hw_state;
	intel_connector->unregister = intel_dp_connector_unregister;
 
	/* Set up the hotplug pin. */
	switch (port) {
	case PORT_A:
		intel_encoder->hpd_pin = HPD_PORT_A;
			break;
	case PORT_B:
		intel_encoder->hpd_pin = HPD_PORT_B;
			break;
	case PORT_C:
		intel_encoder->hpd_pin = HPD_PORT_C;
			break;
	case PORT_D:
		intel_encoder->hpd_pin = HPD_PORT_D;
			break;
	default:
		BUG();
	}
 
	if (is_edp(intel_dp)) {
		intel_dp_init_panel_power_timestamps(intel_dp);
		intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
	}
 
	intel_dp_aux_init(intel_dp, intel_connector);
 
	/* init MST on ports that can support it */
	if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
		if (port == PORT_B || port == PORT_C || port == PORT_D) {
			intel_dp_mst_encoder_init(intel_dig_port, intel_connector->base.base.id);
		}
	}
 
	if (!intel_edp_init_connector(intel_dp, intel_connector, &power_seq)) {
		drm_dp_aux_unregister(&intel_dp->aux);
	if (is_edp(intel_dp)) {
			cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
			drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
			edp_panel_vdd_off_sync(intel_dp);
			drm_modeset_unlock(&dev->mode_config.connection_mutex);
		}
		drm_connector_unregister(connector);
		drm_connector_cleanup(connector);
		return false;
	}
 
	intel_dp_add_properties(intel_dp, connector);
 
	/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
	 * 0xd.  Failure to do so will result in spurious interrupts being
	 * generated on the port when a cable is not attached.
	 */
	if (IS_G4X(dev) && !IS_GM45(dev)) {
		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
	}
 
	return true;
}
 
void
intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *intel_dig_port;
	struct intel_encoder *intel_encoder;
	struct drm_encoder *encoder;
	struct intel_connector *intel_connector;
 
	intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
	if (!intel_dig_port)
		return;
 
	intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
	if (!intel_connector) {
		kfree(intel_dig_port);
		return;
	}
 
	intel_encoder = &intel_dig_port->base;
	encoder = &intel_encoder->base;
 
	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
			 DRM_MODE_ENCODER_TMDS);
 
	intel_encoder->compute_config = intel_dp_compute_config;
	intel_encoder->disable = intel_disable_dp;
	intel_encoder->get_hw_state = intel_dp_get_hw_state;
	intel_encoder->get_config = intel_dp_get_config;
	intel_encoder->suspend = intel_dp_encoder_suspend;
	if (IS_CHERRYVIEW(dev)) {
		intel_encoder->pre_pll_enable = chv_dp_pre_pll_enable;
		intel_encoder->pre_enable = chv_pre_enable_dp;
		intel_encoder->enable = vlv_enable_dp;
		intel_encoder->post_disable = chv_post_disable_dp;
	} else if (IS_VALLEYVIEW(dev)) {
		intel_encoder->pre_pll_enable = vlv_dp_pre_pll_enable;
		intel_encoder->pre_enable = vlv_pre_enable_dp;
		intel_encoder->enable = vlv_enable_dp;
		intel_encoder->post_disable = vlv_post_disable_dp;
	} else {
		intel_encoder->pre_enable = g4x_pre_enable_dp;
		intel_encoder->enable = g4x_enable_dp;
		intel_encoder->post_disable = g4x_post_disable_dp;
	}
 
	intel_dig_port->port = port;
	intel_dig_port->dp.output_reg = output_reg;
 
	intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
	if (IS_CHERRYVIEW(dev)) {
		if (port == PORT_D)
			intel_encoder->crtc_mask = 1 << 2;
		else
			intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
	} else {
	intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
	}
	intel_encoder->cloneable = 0;
	intel_encoder->hot_plug = intel_dp_hot_plug;
 
	intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
	dev_priv->hpd_irq_port[port] = intel_dig_port;
 
	if (!intel_dp_init_connector(intel_dig_port, intel_connector)) {
		drm_encoder_cleanup(encoder);
		kfree(intel_dig_port);
		kfree(intel_connector);
	}
}
 
void intel_dp_mst_suspend(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;
 
	/* disable MST */
	for (i = 0; i < I915_MAX_PORTS; i++) {
		struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i];
		if (!intel_dig_port)
			continue;
 
		if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) {
			if (!intel_dig_port->dp.can_mst)
				continue;
			if (intel_dig_port->dp.is_mst)
				drm_dp_mst_topology_mgr_suspend(&intel_dig_port->dp.mst_mgr);
		}
	}
}
 
void intel_dp_mst_resume(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;
 
	for (i = 0; i < I915_MAX_PORTS; i++) {
		struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i];
		if (!intel_dig_port)
			continue;
		if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) {
			int ret;
 
			if (!intel_dig_port->dp.can_mst)
				continue;
 
			ret = drm_dp_mst_topology_mgr_resume(&intel_dig_port->dp.mst_mgr);
			if (ret != 0) {
				intel_dp_check_mst_status(&intel_dig_port->dp);
			}
		}
	}
}
>
>
>
>

Rev 5060	Rev 5097
1	/*	1	/*
2	* Copyright © 2008 Intel Corporation	2	* Copyright © 2008 Intel Corporation
3	*	3	*
4	* Permission is hereby granted, free of charge, to any person obtaining a	4	* Permission is hereby granted, free of charge, to any person obtaining a
5	* copy of this software and associated documentation files (the "Software"),	5	* copy of this software and associated documentation files (the "Software"),
6	* to deal in the Software without restriction, including without limitation	6	* to deal in the Software without restriction, including without limitation
7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
8	* and/or sell copies of the Software, and to permit persons to whom the	8	* and/or sell copies of the Software, and to permit persons to whom the
9	* Software is furnished to do so, subject to the following conditions:	9	* Software is furnished to do so, subject to the following conditions:
10	*	10	*
11	* The above copyright notice and this permission notice (including the next	11	* The above copyright notice and this permission notice (including the next
12	* paragraph) shall be included in all copies or substantial portions of the	12	* paragraph) shall be included in all copies or substantial portions of the
13	* Software.	13	* Software.
14	*	14	*
15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21	* IN THE SOFTWARE.	21	* IN THE SOFTWARE.
22	*	22	*
23	* Authors:	23	* Authors:
24	* Keith Packard	24	* Keith Packard
25	*	25	*
26	*/	26	*/
27		27
28	#include	28	#include
29	#include	29	#include
30	#include	30	#include
31	#include	31	#include
32	#include	32	#include
33	#include	33	#include
34	#include	34	#include
35	#include "intel_drv.h"	35	#include "intel_drv.h"
36	#include	36	#include
37	#include "i915_drv.h"	37	#include "i915_drv.h"
38		38
39	#define DP_LINK_CHECK_TIMEOUT (10 * 1000)	39	#define DP_LINK_CHECK_TIMEOUT (10 * 1000)
40		40
41	struct dp_link_dpll {	41	struct dp_link_dpll {
42	int link_bw;	42	int link_bw;
43	struct dpll dpll;	43	struct dpll dpll;
44	};	44	};
45		45
46	static const struct dp_link_dpll gen4_dpll[] = {	46	static const struct dp_link_dpll gen4_dpll[] = {
47	{ DP_LINK_BW_1_62,	47	{ DP_LINK_BW_1_62,
48	{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },	48	{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
49	{ DP_LINK_BW_2_7,	49	{ DP_LINK_BW_2_7,
50	{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }	50	{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
51	};	51	};
52		52
53	static const struct dp_link_dpll pch_dpll[] = {	53	static const struct dp_link_dpll pch_dpll[] = {
54	{ DP_LINK_BW_1_62,	54	{ DP_LINK_BW_1_62,
55	{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },	55	{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
56	{ DP_LINK_BW_2_7,	56	{ DP_LINK_BW_2_7,
57	{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }	57	{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
58	};	58	};
59		59
60	static const struct dp_link_dpll vlv_dpll[] = {	60	static const struct dp_link_dpll vlv_dpll[] = {
61	{ DP_LINK_BW_1_62,	61	{ DP_LINK_BW_1_62,
62	{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },	62	{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
63	{ DP_LINK_BW_2_7,	63	{ DP_LINK_BW_2_7,
64	{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }	64	{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
65	};	65	};
66		66
67	/*	67	/*
68	* CHV supports eDP 1.4 that have more link rates.	68	* CHV supports eDP 1.4 that have more link rates.
69	* Below only provides the fixed rate but exclude variable rate.	69	* Below only provides the fixed rate but exclude variable rate.
70	*/	70	*/
71	static const struct dp_link_dpll chv_dpll[] = {	71	static const struct dp_link_dpll chv_dpll[] = {
72	/*	72	/*
73	* CHV requires to program fractional division for m2.	73	* CHV requires to program fractional division for m2.
74	* m2 is stored in fixed point format using formula below	74	* m2 is stored in fixed point format using formula below
75	* (m2_int << 22) \| m2_fraction	75	* (m2_int << 22) \| m2_fraction
76	*/	76	*/
77	{ DP_LINK_BW_1_62, /* m2_int = 32, m2_fraction = 1677722 */	77	{ DP_LINK_BW_1_62, /* m2_int = 32, m2_fraction = 1677722 */
78	{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },	78	{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
79	{ DP_LINK_BW_2_7, /* m2_int = 27, m2_fraction = 0 */	79	{ DP_LINK_BW_2_7, /* m2_int = 27, m2_fraction = 0 */
80	{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },	80	{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
81	{ DP_LINK_BW_5_4, /* m2_int = 27, m2_fraction = 0 */	81	{ DP_LINK_BW_5_4, /* m2_int = 27, m2_fraction = 0 */
82	{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }	82	{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
83	};	83	};
84		84
85	/**	85	/**
86	* is_edp - is the given port attached to an eDP panel (either CPU or PCH)	86	* is_edp - is the given port attached to an eDP panel (either CPU or PCH)
87	* @intel_dp: DP struct	87	* @intel_dp: DP struct
88	*	88	*
89	* If a CPU or PCH DP output is attached to an eDP panel, this function	89	* If a CPU or PCH DP output is attached to an eDP panel, this function
90	* will return true, and false otherwise.	90	* will return true, and false otherwise.
91	*/	91	*/
92	static bool is_edp(struct intel_dp *intel_dp)	92	static bool is_edp(struct intel_dp *intel_dp)
93	{	93	{
94	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	94	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
95		95
96	return intel_dig_port->base.type == INTEL_OUTPUT_EDP;	96	return intel_dig_port->base.type == INTEL_OUTPUT_EDP;
97	}	97	}
98		98
99	static struct drm_device intel_dp_to_dev(struct intel_dp intel_dp)	99	static struct drm_device intel_dp_to_dev(struct intel_dp intel_dp)
100	{	100	{
101	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	101	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
102		102
103	return intel_dig_port->base.base.dev;	103	return intel_dig_port->base.base.dev;
104	}	104	}
105		105
106	static struct intel_dp intel_attached_dp(struct drm_connector connector)	106	static struct intel_dp intel_attached_dp(struct drm_connector connector)
107	{	107	{
108	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);	108	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
109	}	109	}
110		110
111	static void intel_dp_link_down(struct intel_dp *intel_dp);	111	static void intel_dp_link_down(struct intel_dp *intel_dp);
112	static bool _edp_panel_vdd_on(struct intel_dp *intel_dp);	112	static bool _edp_panel_vdd_on(struct intel_dp *intel_dp);
113	static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);	113	static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
114		114
115	int	115	int
116	intel_dp_max_link_bw(struct intel_dp *intel_dp)	116	intel_dp_max_link_bw(struct intel_dp *intel_dp)
117	{	117	{
118	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];	118	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
119	struct drm_device *dev = intel_dp->attached_connector->base.dev;	119	struct drm_device *dev = intel_dp->attached_connector->base.dev;
120		120
121	switch (max_link_bw) {	121	switch (max_link_bw) {
122	case DP_LINK_BW_1_62:	122	case DP_LINK_BW_1_62:
123	case DP_LINK_BW_2_7:	123	case DP_LINK_BW_2_7:
124	break;	124	break;
125	case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */	125	case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */
126	if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) \|\|	126	if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) \|\|
127	INTEL_INFO(dev)->gen >= 8) &&	127	INTEL_INFO(dev)->gen >= 8) &&
128	intel_dp->dpcd[DP_DPCD_REV] >= 0x12)	128	intel_dp->dpcd[DP_DPCD_REV] >= 0x12)
129	max_link_bw = DP_LINK_BW_5_4;	129	max_link_bw = DP_LINK_BW_5_4;
130	else	130	else
131	max_link_bw = DP_LINK_BW_2_7;	131	max_link_bw = DP_LINK_BW_2_7;
132	break;	132	break;
133	default:	133	default:
134	WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n",	134	WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n",
135	max_link_bw);	135	max_link_bw);
136	max_link_bw = DP_LINK_BW_1_62;	136	max_link_bw = DP_LINK_BW_1_62;
137	break;	137	break;
138	}	138	}
139	return max_link_bw;	139	return max_link_bw;
140	}	140	}
141		141
142	static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)	142	static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
143	{	143	{
144	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	144	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
145	struct drm_device *dev = intel_dig_port->base.base.dev;	145	struct drm_device *dev = intel_dig_port->base.base.dev;
146	u8 source_max, sink_max;	146	u8 source_max, sink_max;
147		147
148	source_max = 4;	148	source_max = 4;
149	if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&	149	if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&
150	(intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)	150	(intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)
151	source_max = 2;	151	source_max = 2;
152		152
153	sink_max = drm_dp_max_lane_count(intel_dp->dpcd);	153	sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
154		154
155	return min(source_max, sink_max);	155	return min(source_max, sink_max);
156	}	156	}
157		157
158	/*	158	/*
159	* The units on the numbers in the next two are... bizarre. Examples will	159	* The units on the numbers in the next two are... bizarre. Examples will
160	* make it clearer; this one parallels an example in the eDP spec.	160	* make it clearer; this one parallels an example in the eDP spec.
161	*	161	*
162	* intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:	162	* intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:
163	*	163	*
164	* 270000 * 1 * 8 / 10 == 216000	164	* 270000 * 1 * 8 / 10 == 216000
165	*	165	*
166	* The actual data capacity of that configuration is 2.16Gbit/s, so the	166	* The actual data capacity of that configuration is 2.16Gbit/s, so the
167	* units are decakilobits. ->clock in a drm_display_mode is in kilohertz -	167	* units are decakilobits. ->clock in a drm_display_mode is in kilohertz -
168	* or equivalently, kilopixels per second - so for 1680x1050R it'd be	168	* or equivalently, kilopixels per second - so for 1680x1050R it'd be
169	* 119000. At 18bpp that's 2142000 kilobits per second.	169	* 119000. At 18bpp that's 2142000 kilobits per second.
170	*	170	*
171	* Thus the strange-looking division by 10 in intel_dp_link_required, to	171	* Thus the strange-looking division by 10 in intel_dp_link_required, to
172	* get the result in decakilobits instead of kilobits.	172	* get the result in decakilobits instead of kilobits.
173	*/	173	*/
174		174
175	static int	175	static int
176	intel_dp_link_required(int pixel_clock, int bpp)	176	intel_dp_link_required(int pixel_clock, int bpp)
177	{	177	{
178	return (pixel_clock * bpp + 9) / 10;	178	return (pixel_clock * bpp + 9) / 10;
179	}	179	}
180		180
181	static int	181	static int
182	intel_dp_max_data_rate(int max_link_clock, int max_lanes)	182	intel_dp_max_data_rate(int max_link_clock, int max_lanes)
183	{	183	{
184	return (max_link_clock * max_lanes * 8) / 10;	184	return (max_link_clock * max_lanes * 8) / 10;
185	}	185	}
186		186
187	static enum drm_mode_status	187	static enum drm_mode_status
188	intel_dp_mode_valid(struct drm_connector *connector,	188	intel_dp_mode_valid(struct drm_connector *connector,
189	struct drm_display_mode *mode)	189	struct drm_display_mode *mode)
190	{	190	{
191	struct intel_dp *intel_dp = intel_attached_dp(connector);	191	struct intel_dp *intel_dp = intel_attached_dp(connector);
192	struct intel_connector *intel_connector = to_intel_connector(connector);	192	struct intel_connector *intel_connector = to_intel_connector(connector);
193	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;	193	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
194	int target_clock = mode->clock;	194	int target_clock = mode->clock;
195	int max_rate, mode_rate, max_lanes, max_link_clock;	195	int max_rate, mode_rate, max_lanes, max_link_clock;
196		196
197	if (is_edp(intel_dp) && fixed_mode) {	197	if (is_edp(intel_dp) && fixed_mode) {
198	if (mode->hdisplay > fixed_mode->hdisplay)	198	if (mode->hdisplay > fixed_mode->hdisplay)
199	return MODE_PANEL;	199	return MODE_PANEL;
200		200
201	if (mode->vdisplay > fixed_mode->vdisplay)	201	if (mode->vdisplay > fixed_mode->vdisplay)
202	return MODE_PANEL;	202	return MODE_PANEL;
203		203
204	target_clock = fixed_mode->clock;	204	target_clock = fixed_mode->clock;
205	}	205	}
206		206
207	max_link_clock = drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));	207	max_link_clock = drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
208	max_lanes = intel_dp_max_lane_count(intel_dp);	208	max_lanes = intel_dp_max_lane_count(intel_dp);
209		209
210	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);	210	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
211	mode_rate = intel_dp_link_required(target_clock, 18);	211	mode_rate = intel_dp_link_required(target_clock, 18);
212		212
213	if (mode_rate > max_rate)	213	if (mode_rate > max_rate)
214	return MODE_CLOCK_HIGH;	214	return MODE_CLOCK_HIGH;
215		215
216	if (mode->clock < 10000)	216	if (mode->clock < 10000)
217	return MODE_CLOCK_LOW;	217	return MODE_CLOCK_LOW;
218		218
219	if (mode->flags & DRM_MODE_FLAG_DBLCLK)	219	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
220	return MODE_H_ILLEGAL;	220	return MODE_H_ILLEGAL;
221		221
222	return MODE_OK;	222	return MODE_OK;
223	}	223	}
224		224
225	static uint32_t	225	static uint32_t
226	pack_aux(uint8_t *src, int src_bytes)	226	pack_aux(uint8_t *src, int src_bytes)
227	{	227	{
228	int i;	228	int i;
229	uint32_t v = 0;	229	uint32_t v = 0;
230		230
231	if (src_bytes > 4)	231	if (src_bytes > 4)
232	src_bytes = 4;	232	src_bytes = 4;
233	for (i = 0; i < src_bytes; i++)	233	for (i = 0; i < src_bytes; i++)
234	v \|= ((uint32_t) src[i]) << ((3-i) * 8);	234	v \|= ((uint32_t) src[i]) << ((3-i) * 8);
235	return v;	235	return v;
236	}	236	}
237		237
238	static void	238	static void
239	unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)	239	unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
240	{	240	{
241	int i;	241	int i;
242	if (dst_bytes > 4)	242	if (dst_bytes > 4)
243	dst_bytes = 4;	243	dst_bytes = 4;
244	for (i = 0; i < dst_bytes; i++)	244	for (i = 0; i < dst_bytes; i++)
245	dst[i] = src >> ((3-i) * 8);	245	dst[i] = src >> ((3-i) * 8);
246	}	246	}
247		247
248	/* hrawclock is 1/4 the FSB frequency */	248	/* hrawclock is 1/4 the FSB frequency */
249	static int	249	static int
250	intel_hrawclk(struct drm_device *dev)	250	intel_hrawclk(struct drm_device *dev)
251	{	251	{
252	struct drm_i915_private *dev_priv = dev->dev_private;	252	struct drm_i915_private *dev_priv = dev->dev_private;
253	uint32_t clkcfg;	253	uint32_t clkcfg;
254		254
255	/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */	255	/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */
256	if (IS_VALLEYVIEW(dev))	256	if (IS_VALLEYVIEW(dev))
257	return 200;	257	return 200;
258		258
259	clkcfg = I915_READ(CLKCFG);	259	clkcfg = I915_READ(CLKCFG);
260	switch (clkcfg & CLKCFG_FSB_MASK) {	260	switch (clkcfg & CLKCFG_FSB_MASK) {
261	case CLKCFG_FSB_400:	261	case CLKCFG_FSB_400:
262	return 100;	262	return 100;
263	case CLKCFG_FSB_533:	263	case CLKCFG_FSB_533:
264	return 133;	264	return 133;
265	case CLKCFG_FSB_667:	265	case CLKCFG_FSB_667:
266	return 166;	266	return 166;
267	case CLKCFG_FSB_800:	267	case CLKCFG_FSB_800:
268	return 200;	268	return 200;
269	case CLKCFG_FSB_1067:	269	case CLKCFG_FSB_1067:
270	return 266;	270	return 266;
271	case CLKCFG_FSB_1333:	271	case CLKCFG_FSB_1333:
272	return 333;	272	return 333;
273	/* these two are just a guess; one of them might be right */	273	/* these two are just a guess; one of them might be right */
274	case CLKCFG_FSB_1600:	274	case CLKCFG_FSB_1600:
275	case CLKCFG_FSB_1600_ALT:	275	case CLKCFG_FSB_1600_ALT:
276	return 400;	276	return 400;
277	default:	277	default:
278	return 133;	278	return 133;
279	}	279	}
280	}	280	}
281		281
282	static void	282	static void
283	intel_dp_init_panel_power_sequencer(struct drm_device *dev,	283	intel_dp_init_panel_power_sequencer(struct drm_device *dev,
284	struct intel_dp *intel_dp,	284	struct intel_dp *intel_dp,
285	struct edp_power_seq *out);	285	struct edp_power_seq *out);
286	static void	286	static void
287	intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,	287	intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
288	struct intel_dp *intel_dp,	288	struct intel_dp *intel_dp,
289	struct edp_power_seq *out);	289	struct edp_power_seq *out);
290		290
291	static enum pipe	291	static enum pipe
292	vlv_power_sequencer_pipe(struct intel_dp *intel_dp)	292	vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
293	{	293	{
294	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	294	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
295	struct drm_crtc *crtc = intel_dig_port->base.base.crtc;	295	struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
296	struct drm_device *dev = intel_dig_port->base.base.dev;	296	struct drm_device *dev = intel_dig_port->base.base.dev;
297	struct drm_i915_private *dev_priv = dev->dev_private;	297	struct drm_i915_private *dev_priv = dev->dev_private;
298	enum port port = intel_dig_port->port;	298	enum port port = intel_dig_port->port;
299	enum pipe pipe;	299	enum pipe pipe;
300		300
301	/* modeset should have pipe */	301	/* modeset should have pipe */
302	if (crtc)	302	if (crtc)
303	return to_intel_crtc(crtc)->pipe;	303	return to_intel_crtc(crtc)->pipe;
304		304
305	/* init time, try to find a pipe with this port selected */	305	/* init time, try to find a pipe with this port selected */
306	for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {	306	for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
307	u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) &	307	u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) &
308	PANEL_PORT_SELECT_MASK;	308	PANEL_PORT_SELECT_MASK;
309	if (port_sel == PANEL_PORT_SELECT_DPB_VLV && port == PORT_B)	309	if (port_sel == PANEL_PORT_SELECT_DPB_VLV && port == PORT_B)
310	return pipe;	310	return pipe;
311	if (port_sel == PANEL_PORT_SELECT_DPC_VLV && port == PORT_C)	311	if (port_sel == PANEL_PORT_SELECT_DPC_VLV && port == PORT_C)
312	return pipe;	312	return pipe;
313	}	313	}
314		314
315	/* shrug */	315	/* shrug */
316	return PIPE_A;	316	return PIPE_A;
317	}	317	}
318		318
319	static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)	319	static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)
320	{	320	{
321	struct drm_device *dev = intel_dp_to_dev(intel_dp);	321	struct drm_device *dev = intel_dp_to_dev(intel_dp);
322		322
323	if (HAS_PCH_SPLIT(dev))	323	if (HAS_PCH_SPLIT(dev))
324	return PCH_PP_CONTROL;	324	return PCH_PP_CONTROL;
325	else	325	else
326	return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp));	326	return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp));
327	}	327	}
328		328
329	static u32 _pp_stat_reg(struct intel_dp *intel_dp)	329	static u32 _pp_stat_reg(struct intel_dp *intel_dp)
330	{	330	{
331	struct drm_device *dev = intel_dp_to_dev(intel_dp);	331	struct drm_device *dev = intel_dp_to_dev(intel_dp);
332		332
333	if (HAS_PCH_SPLIT(dev))	333	if (HAS_PCH_SPLIT(dev))
334	return PCH_PP_STATUS;	334	return PCH_PP_STATUS;
335	else	335	else
336	return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));	336	return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));
337	}	337	}
338		338
339		339
340	static bool edp_have_panel_power(struct intel_dp *intel_dp)	340	static bool edp_have_panel_power(struct intel_dp *intel_dp)
341	{	341	{
342	struct drm_device *dev = intel_dp_to_dev(intel_dp);	342	struct drm_device *dev = intel_dp_to_dev(intel_dp);
343	struct drm_i915_private *dev_priv = dev->dev_private;	343	struct drm_i915_private *dev_priv = dev->dev_private;
344		344
345	return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;	345	return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;
346	}	346	}
347		347
348	static bool edp_have_panel_vdd(struct intel_dp *intel_dp)	348	static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
349	{	349	{
350	struct drm_device *dev = intel_dp_to_dev(intel_dp);	350	struct drm_device *dev = intel_dp_to_dev(intel_dp);
351	struct drm_i915_private *dev_priv = dev->dev_private;	351	struct drm_i915_private *dev_priv = dev->dev_private;
352	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	352	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
353	struct intel_encoder *intel_encoder = &intel_dig_port->base;	353	struct intel_encoder *intel_encoder = &intel_dig_port->base;
354	enum intel_display_power_domain power_domain;	354	enum intel_display_power_domain power_domain;
355		355
356	power_domain = intel_display_port_power_domain(intel_encoder);	356	power_domain = intel_display_port_power_domain(intel_encoder);
357	return intel_display_power_enabled(dev_priv, power_domain) &&	357	return intel_display_power_enabled(dev_priv, power_domain) &&
358	(I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD) != 0;	358	(I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD) != 0;
359	}	359	}
360		360
361	static void	361	static void
362	intel_dp_check_edp(struct intel_dp *intel_dp)	362	intel_dp_check_edp(struct intel_dp *intel_dp)
363	{	363	{
364	struct drm_device *dev = intel_dp_to_dev(intel_dp);	364	struct drm_device *dev = intel_dp_to_dev(intel_dp);
365	struct drm_i915_private *dev_priv = dev->dev_private;	365	struct drm_i915_private *dev_priv = dev->dev_private;
366		366
367	if (!is_edp(intel_dp))	367	if (!is_edp(intel_dp))
368	return;	368	return;
369		369
370	if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {	370	if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
371	WARN(1, "eDP powered off while attempting aux channel communication.\n");	371	WARN(1, "eDP powered off while attempting aux channel communication.\n");
372	DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",	372	DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",
373	I915_READ(_pp_stat_reg(intel_dp)),	373	I915_READ(_pp_stat_reg(intel_dp)),
374	I915_READ(_pp_ctrl_reg(intel_dp)));	374	I915_READ(_pp_ctrl_reg(intel_dp)));
375	}	375	}
376	}	376	}
377		377
378	static uint32_t	378	static uint32_t
379	intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)	379	intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
380	{	380	{
381	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	381	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
382	struct drm_device *dev = intel_dig_port->base.base.dev;	382	struct drm_device *dev = intel_dig_port->base.base.dev;
383	struct drm_i915_private *dev_priv = dev->dev_private;	383	struct drm_i915_private *dev_priv = dev->dev_private;
384	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;	384	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
385	uint32_t status;	385	uint32_t status;
386	bool done;	386	bool done;
387		387
388	#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)	388	#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
389	if (has_aux_irq)	389	if (has_aux_irq)
390	done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,	390	done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
391	msecs_to_jiffies_timeout(10));	391	msecs_to_jiffies_timeout(10));
392	else	392	else
393	done = wait_for_atomic(C, 10) == 0;	393	done = wait_for_atomic(C, 10) == 0;
394	if (!done)	394	if (!done)
395	DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",	395	DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",
396	has_aux_irq);	396	has_aux_irq);
397	#undef C	397	#undef C
398		398
399	return status;	399	return status;
400	}	400	}
401		401
402	static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index)	402	static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
403	{	403	{
404	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	404	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
405	struct drm_device *dev = intel_dig_port->base.base.dev;	405	struct drm_device *dev = intel_dig_port->base.base.dev;
406		406
407	/*	407	/*
408	* The clock divider is based off the hrawclk, and would like to run at	408	* The clock divider is based off the hrawclk, and would like to run at
409	* 2MHz. So, take the hrawclk value and divide by 2 and use that	409	* 2MHz. So, take the hrawclk value and divide by 2 and use that
410	*/	410	*/
411	return index ? 0 : intel_hrawclk(dev) / 2;	411	return index ? 0 : intel_hrawclk(dev) / 2;
412	}	412	}
413		413
414	static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)	414	static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
415	{	415	{
416	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	416	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
417	struct drm_device *dev = intel_dig_port->base.base.dev;	417	struct drm_device *dev = intel_dig_port->base.base.dev;
418		418
419	if (index)	419	if (index)
420	return 0;	420	return 0;
421		421
422	if (intel_dig_port->port == PORT_A) {	422	if (intel_dig_port->port == PORT_A) {
423	if (IS_GEN6(dev) \|\| IS_GEN7(dev))	423	if (IS_GEN6(dev) \|\| IS_GEN7(dev))
424	return 200; /* SNB & IVB eDP input clock at 400Mhz */	424	return 200; /* SNB & IVB eDP input clock at 400Mhz */
425	else	425	else
426	return 225; /* eDP input clock at 450Mhz */	426	return 225; /* eDP input clock at 450Mhz */
427	} else {	427	} else {
428	return DIV_ROUND_UP(intel_pch_rawclk(dev), 2);	428	return DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
429	}	429	}
430	}	430	}
431		431
432	static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)	432	static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
433	{	433	{
434	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	434	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
435	struct drm_device *dev = intel_dig_port->base.base.dev;	435	struct drm_device *dev = intel_dig_port->base.base.dev;
436	struct drm_i915_private *dev_priv = dev->dev_private;	436	struct drm_i915_private *dev_priv = dev->dev_private;
437		437
438	if (intel_dig_port->port == PORT_A) {	438	if (intel_dig_port->port == PORT_A) {
439	if (index)	439	if (index)
440	return 0;	440	return 0;
441	return DIV_ROUND_CLOSEST(intel_ddi_get_cdclk_freq(dev_priv), 2000);	441	return DIV_ROUND_CLOSEST(intel_ddi_get_cdclk_freq(dev_priv), 2000);
442	} else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {	442	} else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
443	/* Workaround for non-ULT HSW */	443	/* Workaround for non-ULT HSW */
444	switch (index) {	444	switch (index) {
445	case 0: return 63;	445	case 0: return 63;
446	case 1: return 72;	446	case 1: return 72;
447	default: return 0;	447	default: return 0;
448	}	448	}
449	} else {	449	} else {
450	return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2);	450	return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
451	}	451	}
452	}	452	}
453		453
454	static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index)	454	static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
455	{	455	{
456	return index ? 0 : 100;	456	return index ? 0 : 100;
457	}	457	}
458		458
459	static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp,	459	static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp,
460	bool has_aux_irq,	460	bool has_aux_irq,
461	int send_bytes,	461	int send_bytes,
462	uint32_t aux_clock_divider)	462	uint32_t aux_clock_divider)
463	{	463	{
464	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	464	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
465	struct drm_device *dev = intel_dig_port->base.base.dev;	465	struct drm_device *dev = intel_dig_port->base.base.dev;
466	uint32_t precharge, timeout;	466	uint32_t precharge, timeout;
467		467
468	if (IS_GEN6(dev))	468	if (IS_GEN6(dev))
469	precharge = 3;	469	precharge = 3;
470	else	470	else
471	precharge = 5;	471	precharge = 5;
472		472
473	if (IS_BROADWELL(dev) && intel_dp->aux_ch_ctl_reg == DPA_AUX_CH_CTL)	473	if (IS_BROADWELL(dev) && intel_dp->aux_ch_ctl_reg == DPA_AUX_CH_CTL)
474	timeout = DP_AUX_CH_CTL_TIME_OUT_600us;	474	timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
475	else	475	else
476	timeout = DP_AUX_CH_CTL_TIME_OUT_400us;	476	timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
477		477
478	return DP_AUX_CH_CTL_SEND_BUSY \|	478	return DP_AUX_CH_CTL_SEND_BUSY \|
479	DP_AUX_CH_CTL_DONE \|	479	DP_AUX_CH_CTL_DONE \|
480	(has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) \|	480	(has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) \|
481	DP_AUX_CH_CTL_TIME_OUT_ERROR \|	481	DP_AUX_CH_CTL_TIME_OUT_ERROR \|
482	timeout \|	482	timeout \|
483	DP_AUX_CH_CTL_RECEIVE_ERROR \|	483	DP_AUX_CH_CTL_RECEIVE_ERROR \|
484	(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) \|	484	(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) \|
485	(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) \|	485	(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) \|
486	(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);	486	(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);
487	}	487	}
488		488
489	static int	489	static int
490	intel_dp_aux_ch(struct intel_dp *intel_dp,	490	intel_dp_aux_ch(struct intel_dp *intel_dp,
491	uint8_t *send, int send_bytes,	491	uint8_t *send, int send_bytes,
492	uint8_t *recv, int recv_size)	492	uint8_t *recv, int recv_size)
493	{	493	{
494	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	494	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
495	struct drm_device *dev = intel_dig_port->base.base.dev;	495	struct drm_device *dev = intel_dig_port->base.base.dev;
496	struct drm_i915_private *dev_priv = dev->dev_private;	496	struct drm_i915_private *dev_priv = dev->dev_private;
497	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;	497	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
498	uint32_t ch_data = ch_ctl + 4;	498	uint32_t ch_data = ch_ctl + 4;
499	uint32_t aux_clock_divider;	499	uint32_t aux_clock_divider;
500	int i, ret, recv_bytes;	500	int i, ret, recv_bytes;

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/i915/intel_dp.c – Rev 5060 → 5097