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)
 
/**
 * 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;
}
 
/**
 * is_pch_edp - is the port on the PCH and attached to an eDP panel?
 * @intel_dp: DP struct
 *
 * Returns true if the given DP struct corresponds to a PCH DP port attached
 * to an eDP panel, false otherwise.  Helpful for determining whether we
 * may need FDI resources for a given DP output or not.
 */
static bool is_pch_edp(struct intel_dp *intel_dp)
{
	return intel_dp->is_pch_edp;
}
 
/**
 * is_cpu_edp - is the port on the CPU and attached to an eDP panel?
 * @intel_dp: DP struct
 *
 * Returns true if the given DP struct corresponds to a CPU eDP port.
 */
static bool is_cpu_edp(struct intel_dp *intel_dp)
{
	return is_edp(intel_dp) && !is_pch_edp(intel_dp);
}
 
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);
}
 
/**
 * intel_encoder_is_pch_edp - is the given encoder a PCH attached eDP?
 * @encoder: DRM encoder
 *
 * Return true if @encoder corresponds to a PCH attached eDP panel.  Needed
 * by intel_display.c.
 */
bool intel_encoder_is_pch_edp(struct drm_encoder *encoder)
{
    struct intel_dp *intel_dp;
 
    if (!encoder)
        return false;
 
    intel_dp = enc_to_intel_dp(encoder);
 
    return is_pch_edp(intel_dp);
}
 
static void intel_dp_link_down(struct intel_dp *intel_dp);
 
void
intel_edp_link_config(struct intel_encoder *intel_encoder,
		       int *lane_num, int *link_bw)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
	*lane_num = intel_dp->lane_count;
	*link_bw = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
}
 
int
intel_edp_target_clock(struct intel_encoder *intel_encoder,
		       struct drm_display_mode *mode)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
	struct intel_connector *intel_connector = intel_dp->attached_connector;
 
	if (intel_connector->panel.fixed_mode)
		return intel_connector->panel.fixed_mode->clock;
	else
		return mode->clock;
}
 
static int
intel_dp_max_link_bw(struct intel_dp *intel_dp)
{
	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
 
	switch (max_link_bw) {
	case DP_LINK_BW_1_62:
	case DP_LINK_BW_2_7:
		break;
	default:
		max_link_bw = DP_LINK_BW_1_62;
		break;
	}
	return max_link_bw;
}
 
/*
 * 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 bool
intel_dp_adjust_dithering(struct intel_dp *intel_dp,
			  struct drm_display_mode *mode,
			  bool adjust_mode)
{
	int max_link_clock =
		drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
	int max_lanes = drm_dp_max_lane_count(intel_dp->dpcd);
	int max_rate, mode_rate;
 
	mode_rate = intel_dp_link_required(mode->clock, 24);
	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 
	if (mode_rate > max_rate) {
		mode_rate = intel_dp_link_required(mode->clock, 18);
		if (mode_rate > max_rate)
			return false;
 
		if (adjust_mode)
			mode->private_flags
				|= INTEL_MODE_DP_FORCE_6BPC;
 
		return true;
	}
 
	return true;
}
 
static int
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;
 
	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;
	}
 
	if (!intel_dp_adjust_dithering(intel_dp, mode, false))
		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 bool ironlake_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(PCH_PP_STATUS) & PP_ON) != 0;
}
 
static bool ironlake_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;
 
	return (I915_READ(PCH_PP_CONTROL) & 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 (!ironlake_edp_have_panel_power(intel_dp) && !ironlake_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(PCH_PP_STATUS),
			      I915_READ(PCH_PP_CONTROL));
	}
}
 
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->output_reg + 0x10;
	uint32_t status;
	bool done;
 
	if (IS_HASWELL(dev)) {
		switch (intel_dig_port->port) {
		case PORT_A:
			ch_ctl = DPA_AUX_CH_CTL;
			break;
		case PORT_B:
			ch_ctl = PCH_DPB_AUX_CH_CTL;
			break;
		case PORT_C:
			ch_ctl = PCH_DPC_AUX_CH_CTL;
			break;
		case PORT_D:
			ch_ctl = PCH_DPD_AUX_CH_CTL;
			break;
		default:
			BUG();
		}
	}
 
#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(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 int
intel_dp_aux_ch(struct intel_dp *intel_dp,
		uint8_t *send, int send_bytes,
		uint8_t *recv, int recv_size)
{
	uint32_t output_reg = intel_dp->output_reg;
	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 = output_reg + 0x10;
	uint32_t ch_data = ch_ctl + 4;
	int i, ret, recv_bytes;
	uint32_t status;
	uint32_t aux_clock_divider;
	int try, precharge;
	bool has_aux_irq = INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev);
 
	/* 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.
	 */
//	pm_qos_update_request(&dev_priv->pm_qos, 0);
 
	if (IS_HASWELL(dev)) {
		switch (intel_dig_port->port) {
		case PORT_A:
			ch_ctl = DPA_AUX_CH_CTL;
			ch_data = DPA_AUX_CH_DATA1;
			break;
		case PORT_B:
			ch_ctl = PCH_DPB_AUX_CH_CTL;
			ch_data = PCH_DPB_AUX_CH_DATA1;
			break;
		case PORT_C:
			ch_ctl = PCH_DPC_AUX_CH_CTL;
			ch_data = PCH_DPC_AUX_CH_DATA1;
			break;
		case PORT_D:
			ch_ctl = PCH_DPD_AUX_CH_CTL;
			ch_data = PCH_DPD_AUX_CH_DATA1;
			break;
		default:
			BUG();
		}
	}
 
	intel_dp_check_edp(intel_dp);
	/* 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
	 *
	 * Note that PCH attached eDP panels should use a 125MHz input
	 * clock divider.
	 */
	if (is_cpu_edp(intel_dp)) {
		if (HAS_DDI(dev))
			aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;
		else if (IS_VALLEYVIEW(dev))
			aux_clock_divider = 100;
		else if (IS_GEN6(dev) || IS_GEN7(dev))
			aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
		else
			aux_clock_divider = 225; /* eDP input clock at 450Mhz */
	} else if (HAS_PCH_SPLIT(dev))
		aux_clock_divider = DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
	else
		aux_clock_divider = intel_hrawclk(dev) / 2;
 
	if (IS_GEN6(dev))
		precharge = 3;
	else
		precharge = 5;
 
	/* 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;
	}
 
	/* 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,
			   DP_AUX_CH_CTL_SEND_BUSY |
			   (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) |
			   DP_AUX_CH_CTL_TIME_OUT_400us |
			   (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) |
			   DP_AUX_CH_CTL_DONE |
			   DP_AUX_CH_CTL_TIME_OUT_ERROR |
			   DP_AUX_CH_CTL_RECEIVE_ERROR);
 
		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) == 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);
 
	return ret;
}
 
/* Write data to the aux channel in native mode */
static int
intel_dp_aux_native_write(struct intel_dp *intel_dp,
			  uint16_t address, uint8_t *send, int send_bytes)
{
	int ret;
	uint8_t	msg[20];
	int msg_bytes;
	uint8_t	ack;
 
	intel_dp_check_edp(intel_dp);
	if (send_bytes > 16)
		return -1;
	msg[0] = AUX_NATIVE_WRITE << 4;
	msg[1] = address >> 8;
	msg[2] = address & 0xff;
	msg[3] = send_bytes - 1;
	memcpy(&msg[4], send, send_bytes);
	msg_bytes = send_bytes + 4;
	for (;;) {
		ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, &ack, 1);
		if (ret < 0)
			return ret;
		if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
			break;
		else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
			udelay(100);
		else
			return -EIO;
	}
	return send_bytes;
}
 
/* Write a single byte to the aux channel in native mode */
static int
intel_dp_aux_native_write_1(struct intel_dp *intel_dp,
			    uint16_t address, uint8_t byte)
{
	return intel_dp_aux_native_write(intel_dp, address, &byte, 1);
}
 
/* read bytes from a native aux channel */
static int
intel_dp_aux_native_read(struct intel_dp *intel_dp,
			 uint16_t address, uint8_t *recv, int recv_bytes)
{
	uint8_t msg[4];
	int msg_bytes;
	uint8_t reply[20];
	int reply_bytes;
	uint8_t ack;
	int ret;
 
	intel_dp_check_edp(intel_dp);
	msg[0] = AUX_NATIVE_READ << 4;
	msg[1] = address >> 8;
	msg[2] = address & 0xff;
	msg[3] = recv_bytes - 1;
 
	msg_bytes = 4;
	reply_bytes = recv_bytes + 1;
 
	for (;;) {
		ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes,
				      reply, reply_bytes);
		if (ret == 0)
			return -EPROTO;
		if (ret < 0)
			return ret;
		ack = reply[0];
		if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK) {
			memcpy(recv, reply + 1, ret - 1);
			return ret - 1;
		}
		else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
			udelay(100);
		else
			return -EIO;
	}
}
 
static int
intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
		    uint8_t write_byte, uint8_t *read_byte)
{
	struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
	struct intel_dp *intel_dp = container_of(adapter,
						struct intel_dp,
						adapter);
	uint16_t address = algo_data->address;
	uint8_t msg[5];
	uint8_t reply[2];
	unsigned retry;
	int msg_bytes;
	int reply_bytes;
	int ret;
 
	intel_dp_check_edp(intel_dp);
	/* Set up the command byte */
	if (mode & MODE_I2C_READ)
		msg[0] = AUX_I2C_READ << 4;
	else
		msg[0] = AUX_I2C_WRITE << 4;
 
	if (!(mode & MODE_I2C_STOP))
		msg[0] |= AUX_I2C_MOT << 4;
 
	msg[1] = address >> 8;
	msg[2] = address;
 
	switch (mode) {
	case MODE_I2C_WRITE:
		msg[3] = 0;
		msg[4] = write_byte;
		msg_bytes = 5;
		reply_bytes = 1;
		break;
	case MODE_I2C_READ:
		msg[3] = 0;
		msg_bytes = 4;
		reply_bytes = 2;
		break;
	default:
		msg_bytes = 3;
		reply_bytes = 1;
		break;
	}
 
	for (retry = 0; retry < 5; retry++) {
		ret = intel_dp_aux_ch(intel_dp,
				      msg, msg_bytes,
				      reply, reply_bytes);
		if (ret < 0) {
			DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
			return ret;
		}
 
		switch (reply[0] & AUX_NATIVE_REPLY_MASK) {
		case AUX_NATIVE_REPLY_ACK:
			/* I2C-over-AUX Reply field is only valid
			 * when paired with AUX ACK.
			 */
			break;
		case AUX_NATIVE_REPLY_NACK:
			DRM_DEBUG_KMS("aux_ch native nack\n");
			return -EREMOTEIO;
		case AUX_NATIVE_REPLY_DEFER:
			udelay(100);
			continue;
		default:
			DRM_ERROR("aux_ch invalid native reply 0x%02x\n",
				  reply[0]);
			return -EREMOTEIO;
		}
 
		switch (reply[0] & AUX_I2C_REPLY_MASK) {
		case AUX_I2C_REPLY_ACK:
			if (mode == MODE_I2C_READ) {
				*read_byte = reply[1];
			}
			return reply_bytes - 1;
		case AUX_I2C_REPLY_NACK:
			DRM_DEBUG_KMS("aux_i2c nack\n");
			return -EREMOTEIO;
		case AUX_I2C_REPLY_DEFER:
			DRM_DEBUG_KMS("aux_i2c defer\n");
			udelay(100);
			break;
		default:
			DRM_ERROR("aux_i2c invalid reply 0x%02x\n", reply[0]);
			return -EREMOTEIO;
		}
	}
 
	DRM_ERROR("too many retries, giving up\n");
	return -EREMOTEIO;
}
 
static int
intel_dp_i2c_init(struct intel_dp *intel_dp,
		  struct intel_connector *intel_connector, const char *name)
{
	int	ret;
 
	DRM_DEBUG_KMS("i2c_init %s\n", name);
	intel_dp->algo.running = false;
	intel_dp->algo.address = 0;
	intel_dp->algo.aux_ch = intel_dp_i2c_aux_ch;
 
	memset(&intel_dp->adapter, '\0', sizeof(intel_dp->adapter));
	intel_dp->adapter.owner = THIS_MODULE;
	intel_dp->adapter.class = I2C_CLASS_DDC;
	strncpy(intel_dp->adapter.name, name, sizeof(intel_dp->adapter.name) - 1);
	intel_dp->adapter.name[sizeof(intel_dp->adapter.name) - 1] = '\0';
	intel_dp->adapter.algo_data = &intel_dp->algo;
	intel_dp->adapter.dev.parent = &intel_connector->base.kdev;
 
	ironlake_edp_panel_vdd_on(intel_dp);
	ret = i2c_dp_aux_add_bus(&intel_dp->adapter);
	ironlake_edp_panel_vdd_off(intel_dp, false);
	return ret;
}
 
bool
intel_dp_mode_fixup(struct drm_encoder *encoder,
		    const struct drm_display_mode *mode,
		    struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
	struct intel_connector *intel_connector = intel_dp->attached_connector;
	int lane_count, clock;
	int max_lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
	int max_clock = intel_dp_max_link_bw(intel_dp) == DP_LINK_BW_2_7 ? 1 : 0;
	int bpp, mode_rate;
	static int bws[2] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7 };
 
	if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
		intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
				       adjusted_mode);
		intel_pch_panel_fitting(dev,
					intel_connector->panel.fitting_mode,
					mode, adjusted_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->clock);
 
	if (!intel_dp_adjust_dithering(intel_dp, adjusted_mode, true))
		return false;
 
	bpp = adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC ? 18 : 24;
 
	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)
		adjusted_mode->private_flags |= INTEL_MODE_LIMITED_COLOR_RANGE;
 
	mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp);
 
	for (clock = 0; clock <= max_clock; clock++) {
	for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
			int link_bw_clock =
				drm_dp_bw_code_to_link_rate(bws[clock]);
			int link_avail = intel_dp_max_data_rate(link_bw_clock,
								lane_count);
 
			if (mode_rate <= link_avail) {
				intel_dp->link_bw = bws[clock];
				intel_dp->lane_count = lane_count;
				adjusted_mode->clock = link_bw_clock;
				DRM_DEBUG_KMS("DP link bw %02x lane "
						"count %d clock %d bpp %d\n",
				       intel_dp->link_bw, intel_dp->lane_count,
				       adjusted_mode->clock, bpp);
				DRM_DEBUG_KMS("DP link bw required %i available %i\n",
					      mode_rate, link_avail);
				return true;
			}
		}
	}
 
	return false;
}
 
void
intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
         struct drm_display_mode *adjusted_mode)
{
    struct drm_device *dev = crtc->dev;
	struct intel_encoder *intel_encoder;
	struct intel_dp *intel_dp;
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    int lane_count = 4;
	struct intel_link_m_n m_n;
    int pipe = intel_crtc->pipe;
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	int target_clock;
 
    /*
     * Find the lane count in the intel_encoder private
     */
	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)
		{
            lane_count = intel_dp->lane_count;
            break;
        }
    }
 
	target_clock = mode->clock;
	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		if (intel_encoder->type == INTEL_OUTPUT_EDP) {
			target_clock = intel_edp_target_clock(intel_encoder,
							      mode);
			break;
		}
	}
 
    /*
     * Compute the GMCH and Link ratios. The '3' here is
     * the number of bytes_per_pixel post-LUT, which we always
     * set up for 8-bits of R/G/B, or 3 bytes total.
     */
	intel_link_compute_m_n(intel_crtc->bpp, lane_count,
			       target_clock, adjusted_mode->clock, &m_n);
 
	if (IS_HASWELL(dev)) {
		I915_WRITE(PIPE_DATA_M1(cpu_transcoder),
			   TU_SIZE(m_n.tu) | m_n.gmch_m);
		I915_WRITE(PIPE_DATA_N1(cpu_transcoder), m_n.gmch_n);
		I915_WRITE(PIPE_LINK_M1(cpu_transcoder), m_n.link_m);
		I915_WRITE(PIPE_LINK_N1(cpu_transcoder), m_n.link_n);
	} else if (HAS_PCH_SPLIT(dev)) {
		I915_WRITE(TRANSDATA_M1(pipe), TU_SIZE(m_n.tu) | m_n.gmch_m);
        I915_WRITE(TRANSDATA_N1(pipe), m_n.gmch_n);
        I915_WRITE(TRANSDPLINK_M1(pipe), m_n.link_m);
        I915_WRITE(TRANSDPLINK_N1(pipe), m_n.link_n);
	} else if (IS_VALLEYVIEW(dev)) {
		I915_WRITE(PIPE_DATA_M1(pipe), TU_SIZE(m_n.tu) | m_n.gmch_m);
		I915_WRITE(PIPE_DATA_N1(pipe), m_n.gmch_n);
		I915_WRITE(PIPE_LINK_M1(pipe), m_n.link_m);
		I915_WRITE(PIPE_LINK_N1(pipe), m_n.link_n);
    } else {
        I915_WRITE(PIPE_GMCH_DATA_M(pipe),
			   TU_SIZE(m_n.tu) | m_n.gmch_m);
        I915_WRITE(PIPE_GMCH_DATA_N(pipe), m_n.gmch_n);
        I915_WRITE(PIPE_DP_LINK_M(pipe), m_n.link_m);
        I915_WRITE(PIPE_DP_LINK_N(pipe), m_n.link_n);
    }
}
 
void intel_dp_init_link_config(struct intel_dp *intel_dp)
{
	memset(intel_dp->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
	intel_dp->link_configuration[0] = intel_dp->link_bw;
	intel_dp->link_configuration[1] = intel_dp->lane_count;
	intel_dp->link_configuration[8] = DP_SET_ANSI_8B10B;
	/*
	 * Check for DPCD version > 1.1 and enhanced framing support
	 */
	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
	    (intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) {
		intel_dp->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
	}
}
 
static void ironlake_set_pll_edp(struct drm_crtc *crtc, int clock)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 dpa_ctl;
 
	DRM_DEBUG_KMS("eDP PLL enable for clock %d\n", clock);
	dpa_ctl = I915_READ(DP_A);
	dpa_ctl &= ~DP_PLL_FREQ_MASK;
 
	if (clock < 200000) {
		/* 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;
	} else {
		dpa_ctl |= DP_PLL_FREQ_270MHZ;
	}
 
	I915_WRITE(DP_A, dpa_ctl);
 
	POSTING_READ(DP_A);
	udelay(500);
}
 
static void
intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
		  struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
	struct drm_crtc *crtc = encoder->crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
	/*
	 * 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;
 
	switch (intel_dp->lane_count) {
	case 1:
		intel_dp->DP |= DP_PORT_WIDTH_1;
		break;
	case 2:
		intel_dp->DP |= DP_PORT_WIDTH_2;
		break;
	case 4:
		intel_dp->DP |= DP_PORT_WIDTH_4;
		break;
	}
	if (intel_dp->has_audio) {
		DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
				 pipe_name(intel_crtc->pipe));
		intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
		intel_write_eld(encoder, adjusted_mode);
	}
 
	intel_dp_init_link_config(intel_dp);
 
	/* Split out the IBX/CPU vs CPT settings */
 
	if (is_cpu_edp(intel_dp) && 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 (intel_dp->link_configuration[1] & DP_LANE_COUNT_ENHANCED_FRAME_EN)
			intel_dp->DP |= DP_ENHANCED_FRAMING;
 
		intel_dp->DP |= intel_crtc->pipe << 29;
 
		/* don't miss out required setting for eDP */
		if (adjusted_mode->clock < 200000)
			intel_dp->DP |= DP_PLL_FREQ_160MHZ;
		else
			intel_dp->DP |= DP_PLL_FREQ_270MHZ;
	} else if (!HAS_PCH_CPT(dev) || is_cpu_edp(intel_dp)) {
		if (!HAS_PCH_SPLIT(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 (intel_dp->link_configuration[1] & DP_LANE_COUNT_ENHANCED_FRAME_EN)
		intel_dp->DP |= DP_ENHANCED_FRAMING;
 
		if (intel_crtc->pipe == 1)
		intel_dp->DP |= DP_PIPEB_SELECT;
 
		if (is_cpu_edp(intel_dp)) {
		/* don't miss out required setting for eDP */
		if (adjusted_mode->clock < 200000)
			intel_dp->DP |= DP_PLL_FREQ_160MHZ;
		else
			intel_dp->DP |= DP_PLL_FREQ_270MHZ;
	}
	} else {
		intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
	}
 
	if (is_cpu_edp(intel_dp))
		ironlake_set_pll_edp(crtc, adjusted_mode->clock);
}
 
#define IDLE_ON_MASK		(PP_ON | 0 	  | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
#define IDLE_ON_VALUE   	(PP_ON | 0 	  | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_ON_IDLE)
 
#define IDLE_OFF_MASK		(PP_ON | 0        | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
#define IDLE_OFF_VALUE		(0     | 0        | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_OFF_IDLE)
 
#define IDLE_CYCLE_MASK		(PP_ON | 0        | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
#define IDLE_CYCLE_VALUE	(0     | 0        | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_OFF_IDLE)
 
static void ironlake_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;
 
	DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n",
		      mask, value,
		      I915_READ(PCH_PP_STATUS),
		      I915_READ(PCH_PP_CONTROL));
 
	if (_wait_for((I915_READ(PCH_PP_STATUS) & mask) == value, 5000, 10)) {
		DRM_ERROR("Panel status timeout: status %08x control %08x\n",
			  I915_READ(PCH_PP_STATUS),
			  I915_READ(PCH_PP_CONTROL));
	}
}
 
static void ironlake_wait_panel_on(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power on\n");
	ironlake_wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
}
 
static void ironlake_wait_panel_off(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power off time\n");
	ironlake_wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
}
 
static void ironlake_wait_panel_power_cycle(struct intel_dp *intel_dp)
{
	DRM_DEBUG_KMS("Wait for panel power cycle\n");
	ironlake_wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
}
 
 
/* Read the current pp_control value, unlocking the register if it
 * is locked
 */
 
static  u32 ironlake_get_pp_control(struct drm_i915_private *dev_priv)
{
	u32	control = I915_READ(PCH_PP_CONTROL);
 
	control &= ~PANEL_UNLOCK_MASK;
	control |= PANEL_UNLOCK_REGS;
	return control;
}
 
void ironlake_edp_panel_vdd_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;
 
	if (!is_edp(intel_dp))
		return;
	DRM_DEBUG_KMS("Turn eDP VDD on\n");
 
	WARN(intel_dp->want_panel_vdd,
	     "eDP VDD already requested on\n");
 
	intel_dp->want_panel_vdd = true;
 
	if (ironlake_edp_have_panel_vdd(intel_dp)) {
		DRM_DEBUG_KMS("eDP VDD already on\n");
		return;
	}
 
	if (!ironlake_edp_have_panel_power(intel_dp))
		ironlake_wait_panel_power_cycle(intel_dp);
 
	pp = ironlake_get_pp_control(dev_priv);
	pp |= EDP_FORCE_VDD;
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
	DRM_DEBUG_KMS("PCH_PP_STATUS: 0x%08x PCH_PP_CONTROL: 0x%08x\n",
		      I915_READ(PCH_PP_STATUS), I915_READ(PCH_PP_CONTROL));
 
	/*
	 * If the panel wasn't on, delay before accessing aux channel
	 */
	if (!ironlake_edp_have_panel_power(intel_dp)) {
		DRM_DEBUG_KMS("eDP was not running\n");
		msleep(intel_dp->panel_power_up_delay);
	}
}
 
static void ironlake_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;
 
	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 
	if (!intel_dp->want_panel_vdd && ironlake_edp_have_panel_vdd(intel_dp)) {
		pp = ironlake_get_pp_control(dev_priv);
	pp &= ~EDP_FORCE_VDD;
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
 
	/* Make sure sequencer is idle before allowing subsequent activity */
		DRM_DEBUG_KMS("PCH_PP_STATUS: 0x%08x PCH_PP_CONTROL: 0x%08x\n",
			      I915_READ(PCH_PP_STATUS), I915_READ(PCH_PP_CONTROL));
 
		msleep(intel_dp->panel_power_down_delay);
	}
}
 
static void ironlake_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);
 
	mutex_lock(&dev->mode_config.mutex);
	ironlake_panel_vdd_off_sync(intel_dp);
	mutex_unlock(&dev->mode_config.mutex);
}
 
void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("Turn eDP VDD off %d\n", intel_dp->want_panel_vdd);
	WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");
 
	intel_dp->want_panel_vdd = false;
 
	if (sync) {
		ironlake_panel_vdd_off_sync(intel_dp);
	} else {
		/*
		 * 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
		 */
		schedule_delayed_work(&intel_dp->panel_vdd_work,
				      msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
	}
}
 
void ironlake_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;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("Turn eDP power on\n");
 
	if (ironlake_edp_have_panel_power(intel_dp)) {
		DRM_DEBUG_KMS("eDP power already on\n");
		return;
	}
 
	ironlake_wait_panel_power_cycle(intel_dp);
 
	pp = ironlake_get_pp_control(dev_priv);
	if (IS_GEN5(dev)) {
	/* ILK workaround: disable reset around power sequence */
	pp &= ~PANEL_POWER_RESET;
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
	}
 
	pp |= POWER_TARGET_ON;
	if (!IS_GEN5(dev))
		pp |= PANEL_POWER_RESET;
 
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
 
	ironlake_wait_panel_on(intel_dp);
 
	if (IS_GEN5(dev)) {
	pp |= PANEL_POWER_RESET; /* restore panel reset bit */
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
	}
}
 
void ironlake_edp_panel_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;
 
	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(dev_priv);
	/* 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 | EDP_FORCE_VDD | PANEL_POWER_RESET | EDP_BLC_ENABLE);
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
 
	intel_dp->want_panel_vdd = false;
 
	ironlake_wait_panel_off(intel_dp);
}
 
void ironlake_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;
	int pipe = to_intel_crtc(intel_dig_port->base.base.crtc)->pipe;
	u32 pp;
 
	if (!is_edp(intel_dp))
		return;
 
	DRM_DEBUG_KMS("\n");
	/*
	 * 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.
	 */
	msleep(intel_dp->backlight_on_delay);
	pp = ironlake_get_pp_control(dev_priv);
	pp |= EDP_BLC_ENABLE;
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
 
	intel_panel_enable_backlight(dev, pipe);
}
 
void ironlake_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;
 
	if (!is_edp(intel_dp))
		return;
 
	intel_panel_disable_backlight(dev);
 
	DRM_DEBUG_KMS("\n");
	pp = ironlake_get_pp_control(dev_priv);
	pp &= ~EDP_BLC_ENABLE;
	I915_WRITE(PCH_PP_CONTROL, pp);
	POSTING_READ(PCH_PP_CONTROL);
	msleep(intel_dp->backlight_off_delay);
}
 
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 = intel_dp_aux_native_write_1(intel_dp, 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 = intel_dp_aux_native_write_1(intel_dp,
							  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);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 tmp = I915_READ(intel_dp->output_reg);
 
	if (!(tmp & DP_PORT_EN))
		return false;
 
	if (is_cpu_edp(intel_dp) && IS_GEN7(dev)) {
		*pipe = PORT_TO_PIPE_CPT(tmp);
	} else if (!HAS_PCH_CPT(dev) || is_cpu_edp(intel_dp)) {
		*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_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	/* 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. */
		ironlake_edp_panel_vdd_on(intel_dp);
	ironlake_edp_backlight_off(intel_dp);
	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
	ironlake_edp_panel_off(intel_dp);
 
	/* cpu edp my only be disable _after_ the cpu pipe/plane is disabled. */
	if (!is_cpu_edp(intel_dp))
		intel_dp_link_down(intel_dp);
}
 
static void intel_post_disable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	if (is_cpu_edp(intel_dp)) {
		intel_dp_link_down(intel_dp);
		ironlake_edp_pll_off(intel_dp);
	}
}
 
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;
 
		ironlake_edp_panel_vdd_on(intel_dp);
	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
			intel_dp_start_link_train(intel_dp);
				ironlake_edp_panel_on(intel_dp);
			ironlake_edp_panel_vdd_off(intel_dp, true);
			intel_dp_complete_link_train(intel_dp);
		ironlake_edp_backlight_on(intel_dp);
}
 
static void intel_pre_enable_dp(struct intel_encoder *encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
	if (is_cpu_edp(intel_dp))
		ironlake_edp_pll_on(intel_dp);
}
 
/*
 * Native read with retry for link status and receiver capability reads for
 * cases where the sink may still be asleep.
 */
static bool
intel_dp_aux_native_read_retry(struct intel_dp *intel_dp, uint16_t address,
			       uint8_t *recv, int recv_bytes)
{
	int ret, i;
 
	/*
	 * Sinks are *supposed* to come up within 1ms from an off state,
	 * but we're also supposed to retry 3 times per the spec.
	 */
	for (i = 0; i < 3; i++) {
		ret = intel_dp_aux_native_read(intel_dp, address, recv,
					       recv_bytes);
		if (ret == recv_bytes)
			return true;
		msleep(1);
	}
 
	return false;
}
 
/*
 * 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_aux_native_read_retry(intel_dp,
					      DP_LANE0_1_STATUS,
					      link_status,
					      DP_LINK_STATUS_SIZE);
}
 
#if 0
static char	*voltage_names[] = {
	"0.4V", "0.6V", "0.8V", "1.2V"
};
static char	*pre_emph_names[] = {
	"0dB", "3.5dB", "6dB", "9.5dB"
};
static char	*link_train_names[] = {
	"pattern 1", "pattern 2", "idle", "off"
};
#endif
 
/*
 * These are source-specific values; current Intel hardware supports
 * a maximum voltage of 800mV and a maximum pre-emphasis of 6dB
 */
 
static uint8_t
intel_dp_voltage_max(struct intel_dp *intel_dp)
{
	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
	if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
		return DP_TRAIN_VOLTAGE_SWING_800;
	else if (HAS_PCH_CPT(dev) && !is_cpu_edp(intel_dp))
		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);
 
	if (IS_HASWELL(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) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
		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 void
intel_get_adjust_train(struct intel_dp *intel_dp, 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);
	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)) {
		signal_levels = intel_hsw_signal_levels(train_set);
		mask = DDI_BUF_EMP_MASK;
	} else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
		signal_levels = intel_gen7_edp_signal_levels(train_set);
		mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB;
	} else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
		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_reg_value,
			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;
	int ret;
	uint32_t temp;
 
	if (IS_HASWELL(dev)) {
		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:
 
			if (port != PORT_A) {
			temp |= DP_TP_CTL_LINK_TRAIN_IDLE;
			I915_WRITE(DP_TP_CTL(port), temp);
 
			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");
 
			temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
			}
 
			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) || !is_cpu_edp(intel_dp))) {
		dp_reg_value &= ~DP_LINK_TRAIN_MASK_CPT;
 
		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
		case DP_TRAINING_PATTERN_DISABLE:
			dp_reg_value |= DP_LINK_TRAIN_OFF_CPT;
			break;
		case DP_TRAINING_PATTERN_1:
			dp_reg_value |= DP_LINK_TRAIN_PAT_1_CPT;
			break;
		case DP_TRAINING_PATTERN_2:
			dp_reg_value |= DP_LINK_TRAIN_PAT_2_CPT;
			break;
		case DP_TRAINING_PATTERN_3:
			DRM_ERROR("DP training pattern 3 not supported\n");
			dp_reg_value |= DP_LINK_TRAIN_PAT_2_CPT;
			break;
		}
 
	} else {
		dp_reg_value &= ~DP_LINK_TRAIN_MASK;
 
		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
		case DP_TRAINING_PATTERN_DISABLE:
			dp_reg_value |= DP_LINK_TRAIN_OFF;
			break;
		case DP_TRAINING_PATTERN_1:
			dp_reg_value |= DP_LINK_TRAIN_PAT_1;
			break;
		case DP_TRAINING_PATTERN_2:
			dp_reg_value |= DP_LINK_TRAIN_PAT_2;
			break;
		case DP_TRAINING_PATTERN_3:
			DRM_ERROR("DP training pattern 3 not supported\n");
			dp_reg_value |= DP_LINK_TRAIN_PAT_2;
			break;
		}
	}
 
	I915_WRITE(intel_dp->output_reg, dp_reg_value);
	POSTING_READ(intel_dp->output_reg);
 
	intel_dp_aux_native_write_1(intel_dp,
				    DP_TRAINING_PATTERN_SET,
				    dp_train_pat);
 
	if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) !=
	    DP_TRAINING_PATTERN_DISABLE) {
	ret = intel_dp_aux_native_write(intel_dp,
					DP_TRAINING_LANE0_SET,
					intel_dp->train_set,
					intel_dp->lane_count);
	if (ret != intel_dp->lane_count)
		return false;
	}
 
	return true;
}
 
/* 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;
	bool clock_recovery = false;
	int voltage_tries, loop_tries;
	uint32_t DP = intel_dp->DP;
 
	if (HAS_DDI(dev))
		intel_ddi_prepare_link_retrain(encoder);
 
	/* Write the link configuration data */
	intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET,
				  intel_dp->link_configuration,
				  DP_LINK_CONFIGURATION_SIZE);
 
	DP |= DP_PORT_EN;
 
	memset(intel_dp->train_set, 0, 4);
	voltage = 0xff;
	voltage_tries = 0;
	loop_tries = 0;
	clock_recovery = false;
	for (;;) {
		/* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
		uint8_t	    link_status[DP_LINK_STATUS_SIZE];
 
		intel_dp_set_signal_levels(intel_dp, &DP);
 
		/* Set training pattern 1 */
		if (!intel_dp_set_link_train(intel_dp, DP,
					     DP_TRAINING_PATTERN_1 |
					     DP_LINK_SCRAMBLING_DISABLE))
			break;
 
		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");
			clock_recovery = true;
			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_DEBUG_KMS("too many full retries, give up\n");
			break;
			}
			memset(intel_dp->train_set, 0, 4);
			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_DEBUG_KMS("too many voltage retries, give up\n");
				break;
			}
		} else
			voltage_tries = 0;
		voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 
		/* Compute new intel_dp->train_set as requested by target */
		intel_get_adjust_train(intel_dp, link_status);
	}
 
	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;
 
	/* channel equalization */
	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");
			intel_dp_link_down(intel_dp);
			break;
		}
 
		intel_dp_set_signal_levels(intel_dp, &DP);
 
		/* channel eq pattern */
		if (!intel_dp_set_link_train(intel_dp, DP,
					     DP_TRAINING_PATTERN_2 |
					     DP_LINK_SCRAMBLING_DISABLE))
			break;
 
		drm_dp_link_train_channel_eq_delay(intel_dp->dpcd);
		if (!intel_dp_get_link_status(intel_dp, link_status))
			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);
			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);
			tries = 0;
			cr_tries++;
			continue;
		}
 
		/* Compute new intel_dp->train_set as requested by target */
		intel_get_adjust_train(intel_dp, link_status);
		++tries;
	}
 
	if (channel_eq)
		DRM_DEBUG_KMS("Channel EQ done. DP Training successfull\n");
 
	intel_dp_set_link_train(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);
	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;
 
	/*
	 * DDI code has a strict mode set sequence and we should try to respect
	 * it, otherwise we might hang the machine in many different ways. So we
	 * really should be disabling the port only on a complete crtc_disable
	 * sequence. This function is just called under two conditions on DDI
	 * code:
	 * - Link train failed while doing crtc_enable, and on this case we
	 *   really should respect the mode set sequence and wait for a
	 *   crtc_disable.
	 * - Someone turned the monitor off and intel_dp_check_link_status
	 *   called us. We don't need to disable the whole port on this case, so
	 *   when someone turns the monitor on again,
	 *   intel_ddi_prepare_link_retrain will take care of redoing the link
	 *   train.
	 */
	if (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) || !is_cpu_edp(intel_dp))) {
		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);
 
	/* We don't really know why we're doing this */
	intel_wait_for_vblank(dev, intel_crtc->pipe);
 
	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)
{
	char dpcd_hex_dump[sizeof(intel_dp->dpcd) * 3];
 
	if (intel_dp_aux_native_read_retry(intel_dp, 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 */
 
	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_aux_native_read_retry(intel_dp, 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;
 
	ironlake_edp_panel_vdd_on(intel_dp);
 
	if (intel_dp_aux_native_read_retry(intel_dp, DP_SINK_OUI, buf, 3))
		DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
			      buf[0], buf[1], buf[2]);
 
	if (intel_dp_aux_native_read_retry(intel_dp, DP_BRANCH_OUI, buf, 3))
		DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
			      buf[0], buf[1], buf[2]);
 
	ironlake_edp_panel_vdd_off(intel_dp, false);
}
 
static bool
intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
	int ret;
 
	ret = intel_dp_aux_native_read_retry(intel_dp,
					     DP_DEVICE_SERVICE_IRQ_VECTOR,
					     sink_irq_vector, 1);
	if (!ret)
		return false;
 
	return true;
}
 
static void
intel_dp_handle_test_request(struct intel_dp *intel_dp)
{
	/* NAK by default */
	intel_dp_aux_native_write_1(intel_dp, DP_TEST_RESPONSE, DP_TEST_NAK);
}
 
/*
 * 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 intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
	u8 sink_irq_vector;
	u8 link_status[DP_LINK_STATUS_SIZE];
 
	if (!intel_encoder->connectors_active)
		return;
 
	if (WARN_ON(!intel_encoder->base.crtc))
		return;
 
	/* Try to read receiver status if the link appears to be up */
	if (!intel_dp_get_link_status(intel_dp, link_status)) {
		intel_dp_link_down(intel_dp);
		return;
	}
 
	/* Now read the DPCD to see if it's actually running */
	if (!intel_dp_get_dpcd(intel_dp)) {
		intel_dp_link_down(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 */
		intel_dp_aux_native_write_1(intel_dp,
					    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",
			      drm_get_encoder_name(&intel_encoder->base));
		intel_dp_start_link_train(intel_dp);
		intel_dp_complete_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;
	bool hpd;
	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 */
	hpd = !!(intel_dp->downstream_ports[0] & DP_DS_PORT_HPD);
	if (hpd) {
		uint8_t reg;
		if (!intel_dp_aux_native_read_retry(intel_dp, DP_SINK_COUNT,
						    ®, 1))
			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->adapter))
		return connector_status_connected;
 
	/* Well we tried, say unknown for unreliable port types */
	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;
 
	/* 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 enum drm_connector_status
g4x_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);
	uint32_t bit;
 
	switch (intel_dig_port->port) {
	case PORT_B:
		bit = PORTB_HOTPLUG_LIVE_STATUS;
		break;
	case PORT_C:
		bit = PORTC_HOTPLUG_LIVE_STATUS;
		break;
	case PORT_D:
		bit = PORTD_HOTPLUG_LIVE_STATUS;
		break;
	default:
		return connector_status_unknown;
	}
 
	if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 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) {
	struct edid	*edid;
	int size;
 
		/* invalid edid */
		if (IS_ERR(intel_connector->edid))
			return NULL;
 
		size = (intel_connector->edid->extensions + 1) * EDID_LENGTH;
		edid = kmalloc(size, GFP_KERNEL);
		if (!edid)
			return NULL;
 
		memcpy(edid, intel_connector->edid, size);
		return 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;
	enum drm_connector_status status;
	struct edid *edid = NULL;
 
	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)
		return status;
 
	intel_dp_probe_oui(intel_dp);
 
	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->adapter);
		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;
	return connector_status_connected;
}
 
static int intel_dp_get_modes(struct drm_connector *connector)
{
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_connector *intel_connector = to_intel_connector(connector);
	struct drm_device *dev = connector->dev;
	int ret;
 
	/* We should parse the EDID data and find out if it has an audio sink
	 */
 
	ret = intel_dp_get_edid_modes(connector, &intel_dp->adapter);
	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 edid *edid;
	bool has_audio = false;
 
	edid = intel_dp_get_edid(connector, &intel_dp->adapter);
	if (edid) {
		has_audio = drm_detect_monitor_audio(edid);
		kfree(edid);
	}
 
	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) {
		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;
		}
	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_destroy(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct intel_dp *intel_dp = intel_attached_dp(connector);
	struct intel_connector *intel_connector = to_intel_connector(connector);
 
	if (!IS_ERR_OR_NULL(intel_connector->edid))
		kfree(intel_connector->edid);
 
	if (is_edp(intel_dp)) {
		intel_panel_destroy_backlight(dev);
		intel_panel_fini(&intel_connector->panel);
	}
 
	drm_sysfs_connector_remove(connector);
	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);
 
	i2c_del_adapter(&intel_dp->adapter);
	drm_encoder_cleanup(encoder);
	if (is_edp(intel_dp)) {
//		cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
		mutex_lock(&dev->mode_config.mutex);
		ironlake_panel_vdd_off_sync(intel_dp);
		mutex_unlock(&dev->mode_config.mutex);
	}
	kfree(intel_dig_port);
}
 
static const struct drm_encoder_helper_funcs intel_dp_helper_funcs = {
	.mode_fixup = intel_dp_mode_fixup,
	.mode_set = intel_dp_mode_set,
};
 
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_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 = {
	.destroy = intel_dp_encoder_destroy,
};
 
static void
intel_dp_hot_plug(struct intel_encoder *intel_encoder)
{
	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
	intel_dp_check_link_status(intel_dp);
}
 
/* 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_dpd_is_edp(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct child_device_config *p_child;
	int i;
 
	if (!dev_priv->child_dev_num)
		return false;
 
	for (i = 0; i < dev_priv->child_dev_num; i++) {
		p_child = dev_priv->child_dev + i;
 
		if (p_child->dvo_port == PORT_IDPD &&
		    p_child->device_type == DEVICE_TYPE_eDP)
			return true;
	}
	return false;
}
 
static 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_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;
 
	/* Workaround: Need to write PP_CONTROL with the unlock key as
	 * the very first thing. */
	pp = ironlake_get_pp_control(dev_priv);
	I915_WRITE(PCH_PP_CONTROL, pp);
 
	pp_on = I915_READ(PCH_PP_ON_DELAYS);
	pp_off = I915_READ(PCH_PP_OFF_DELAYS);
	pp_div = I915_READ(PCH_PP_DIVISOR);
 
	/* 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->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;
 
	/* And finally store the new values in the power sequencer. */
	pp_on = (seq->t1_t3 << PANEL_POWER_UP_DELAY_SHIFT) |
		(seq->t8 << PANEL_LIGHT_ON_DELAY_SHIFT);
	pp_off = (seq->t9 << 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 * intel_pch_rawclk(dev))/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 (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) {
		if (is_cpu_edp(intel_dp))
			pp_on |= PANEL_POWER_PORT_DP_A;
		else
			pp_on |= PANEL_POWER_PORT_DP_D;
	}
 
	I915_WRITE(PCH_PP_ON_DELAYS, pp_on);
	I915_WRITE(PCH_PP_OFF_DELAYS, pp_off);
	I915_WRITE(PCH_PP_DIVISOR, pp_div);
 
	DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
		      I915_READ(PCH_PP_ON_DELAYS),
		      I915_READ(PCH_PP_OFF_DELAYS),
		      I915_READ(PCH_PP_DIVISOR));
}
 
void
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;
	struct drm_display_mode *fixed_mode = NULL;
	struct edp_power_seq power_seq = { 0 };
	enum port port = intel_dig_port->port;
	const char *name = NULL;
	int type;
 
	/* Preserve the current hw state. */
	intel_dp->DP = I915_READ(intel_dp->output_reg);
	intel_dp->attached_connector = intel_connector;
 
	if (HAS_PCH_SPLIT(dev) && port == PORT_D)
		if (intel_dpd_is_edp(dev))
			intel_dp->is_pch_edp = true;
 
	/*
	 * FIXME : We need to initialize built-in panels before external panels.
	 * For X0, DP_C is fixed as eDP. Revisit this as part of VLV eDP cleanup
	 */
	if (IS_VALLEYVIEW(dev) && port == PORT_C) {
		type = DRM_MODE_CONNECTOR_eDP;
		intel_encoder->type = INTEL_OUTPUT_EDP;
	} else if (port == PORT_A || is_pch_edp(intel_dp)) {
		type = DRM_MODE_CONNECTOR_eDP;
		intel_encoder->type = INTEL_OUTPUT_EDP;
	} else {
		/* The intel_encoder->type value may be INTEL_OUTPUT_UNKNOWN for
		 * DDI or INTEL_OUTPUT_DISPLAYPORT for the older gens, so don't
		 * rewrite it.
		 */
		type = DRM_MODE_CONNECTOR_DisplayPort;
	}
 
	drm_connector_init(dev, connector, &intel_dp_connector_funcs, type);
	drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
 
	connector->polled = DRM_CONNECTOR_POLL_HPD;
	connector->interlace_allowed = true;
	connector->doublescan_allowed = 0;
 
	INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
			  ironlake_panel_vdd_work);
 
	intel_connector_attach_encoder(intel_connector, intel_encoder);
	drm_sysfs_connector_add(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;
 
 
	/* Set up the DDC bus. */
	switch (port) {
	case PORT_A:
			name = "DPDDC-A";
			break;
	case PORT_B:
		dev_priv->hotplug_supported_mask |= PORTB_HOTPLUG_INT_STATUS;
			name = "DPDDC-B";
			break;
	case PORT_C:
		dev_priv->hotplug_supported_mask |= PORTC_HOTPLUG_INT_STATUS;
			name = "DPDDC-C";
			break;
	case PORT_D:
		dev_priv->hotplug_supported_mask |= PORTD_HOTPLUG_INT_STATUS;
			name = "DPDDC-D";
			break;
	default:
		WARN(1, "Invalid port %c\n", port_name(port));
		break;
	}
 
	if (is_edp(intel_dp))
		intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
 
	intel_dp_i2c_init(intel_dp, intel_connector, name);
 
	/* Cache DPCD and EDID for edp. */
	if (is_edp(intel_dp)) {
		bool ret;
		struct drm_display_mode *scan;
		struct edid *edid;
 
		ironlake_edp_panel_vdd_on(intel_dp);
		ret = intel_dp_get_dpcd(intel_dp);
		ironlake_edp_panel_vdd_off(intel_dp, false);
 
		if (ret) {
			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");
			intel_dp_encoder_destroy(&intel_encoder->base);
			intel_dp_destroy(connector);
			return;
		}
 
		/* We now know it's not a ghost, init power sequence regs. */
		intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
							      &power_seq);
 
		ironlake_edp_panel_vdd_on(intel_dp);
		edid = drm_get_edid(connector, &intel_dp->adapter);
		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);
				break;
			}
		}
 
		/* fallback to VBT if available for eDP */
		if (!fixed_mode && dev_priv->lfp_lvds_vbt_mode) {
			fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
			if (fixed_mode)
				fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
		}
 
		ironlake_edp_panel_vdd_off(intel_dp, false);
	}
 
	if (is_edp(intel_dp)) {
		intel_panel_init(&intel_connector->panel, fixed_mode);
		intel_panel_setup_backlight(connector);
	}
 
	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);
	}
}
 
void
intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
{
	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(struct intel_digital_port), GFP_KERNEL);
	if (!intel_dig_port)
		return;
 
	intel_connector = kzalloc(sizeof(struct 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);
	drm_encoder_helper_add(&intel_encoder->base, &intel_dp_helper_funcs);
 
	intel_encoder->enable = intel_enable_dp;
	intel_encoder->pre_enable = intel_pre_enable_dp;
	intel_encoder->disable = intel_disable_dp;
	intel_encoder->post_disable = intel_post_disable_dp;
	intel_encoder->get_hw_state = intel_dp_get_hw_state;
 
	intel_dig_port->port = port;
	intel_dig_port->dp.output_reg = output_reg;
 
	intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
	intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
	intel_encoder->cloneable = false;
	intel_encoder->hot_plug = intel_dp_hot_plug;
 
	intel_dp_init_connector(intel_dig_port, intel_connector);
}

Rev 3480	Rev 3482
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	/**	41	/**
42	* is_edp - is the given port attached to an eDP panel (either CPU or PCH)	42	* is_edp - is the given port attached to an eDP panel (either CPU or PCH)
43	* @intel_dp: DP struct	43	* @intel_dp: DP struct
44	*	44	*
45	* If a CPU or PCH DP output is attached to an eDP panel, this function	45	* If a CPU or PCH DP output is attached to an eDP panel, this function
46	* will return true, and false otherwise.	46	* will return true, and false otherwise.
47	*/	47	*/
48	static bool is_edp(struct intel_dp *intel_dp)	48	static bool is_edp(struct intel_dp *intel_dp)
49	{	49	{
50	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	50	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
51		51
52	return intel_dig_port->base.type == INTEL_OUTPUT_EDP;	52	return intel_dig_port->base.type == INTEL_OUTPUT_EDP;
53	}	53	}
54		54
55	/**	55	/**
56	* is_pch_edp - is the port on the PCH and attached to an eDP panel?	56	* is_pch_edp - is the port on the PCH and attached to an eDP panel?
57	* @intel_dp: DP struct	57	* @intel_dp: DP struct
58	*	58	*
59	* Returns true if the given DP struct corresponds to a PCH DP port attached	59	* Returns true if the given DP struct corresponds to a PCH DP port attached
60	* to an eDP panel, false otherwise. Helpful for determining whether we	60	* to an eDP panel, false otherwise. Helpful for determining whether we
61	* may need FDI resources for a given DP output or not.	61	* may need FDI resources for a given DP output or not.
62	*/	62	*/
63	static bool is_pch_edp(struct intel_dp *intel_dp)	63	static bool is_pch_edp(struct intel_dp *intel_dp)
64	{	64	{
65	return intel_dp->is_pch_edp;	65	return intel_dp->is_pch_edp;
66	}	66	}
67		67
68	/**	68	/**
69	* is_cpu_edp - is the port on the CPU and attached to an eDP panel?	69	* is_cpu_edp - is the port on the CPU and attached to an eDP panel?
70	* @intel_dp: DP struct	70	* @intel_dp: DP struct
71	*	71	*
72	* Returns true if the given DP struct corresponds to a CPU eDP port.	72	* Returns true if the given DP struct corresponds to a CPU eDP port.
73	*/	73	*/
74	static bool is_cpu_edp(struct intel_dp *intel_dp)	74	static bool is_cpu_edp(struct intel_dp *intel_dp)
75	{	75	{
76	return is_edp(intel_dp) && !is_pch_edp(intel_dp);	76	return is_edp(intel_dp) && !is_pch_edp(intel_dp);
77	}	77	}
78		78
79	static struct drm_device intel_dp_to_dev(struct intel_dp intel_dp)	79	static struct drm_device intel_dp_to_dev(struct intel_dp intel_dp)
80	{	80	{
81	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	81	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
82		82
83	return intel_dig_port->base.base.dev;	83	return intel_dig_port->base.base.dev;
84	}	84	}
85		85
86	static struct intel_dp intel_attached_dp(struct drm_connector connector)	86	static struct intel_dp intel_attached_dp(struct drm_connector connector)
87	{	87	{
88	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);	88	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
89	}	89	}
90		90
91	/**	91	/**
92	* intel_encoder_is_pch_edp - is the given encoder a PCH attached eDP?	92	* intel_encoder_is_pch_edp - is the given encoder a PCH attached eDP?
93	* @encoder: DRM encoder	93	* @encoder: DRM encoder
94	*	94	*
95	* Return true if @encoder corresponds to a PCH attached eDP panel. Needed	95	* Return true if @encoder corresponds to a PCH attached eDP panel. Needed
96	* by intel_display.c.	96	* by intel_display.c.
97	*/	97	*/
98	bool intel_encoder_is_pch_edp(struct drm_encoder *encoder)	98	bool intel_encoder_is_pch_edp(struct drm_encoder *encoder)
99	{	99	{
100	struct intel_dp *intel_dp;	100	struct intel_dp *intel_dp;
101		101
102	if (!encoder)	102	if (!encoder)
103	return false;	103	return false;
104		104
105	intel_dp = enc_to_intel_dp(encoder);	105	intel_dp = enc_to_intel_dp(encoder);
106		106
107	return is_pch_edp(intel_dp);	107	return is_pch_edp(intel_dp);
108	}	108	}
109		109
110	static void intel_dp_link_down(struct intel_dp *intel_dp);	110	static void intel_dp_link_down(struct intel_dp *intel_dp);
111		111
112	void	112	void
113	intel_edp_link_config(struct intel_encoder *intel_encoder,	113	intel_edp_link_config(struct intel_encoder *intel_encoder,
114	int lane_num, int link_bw)	114	int lane_num, int link_bw)
115	{	115	{
116	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);	116	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
117		117
118	*lane_num = intel_dp->lane_count;	118	*lane_num = intel_dp->lane_count;
119	*link_bw = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);	119	*link_bw = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
120	}	120	}
121		121
122	int	122	int
123	intel_edp_target_clock(struct intel_encoder *intel_encoder,	123	intel_edp_target_clock(struct intel_encoder *intel_encoder,
124	struct drm_display_mode *mode)	124	struct drm_display_mode *mode)
125	{	125	{
126	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);	126	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
127	struct intel_connector *intel_connector = intel_dp->attached_connector;	127	struct intel_connector *intel_connector = intel_dp->attached_connector;
128		128
129	if (intel_connector->panel.fixed_mode)	129	if (intel_connector->panel.fixed_mode)
130	return intel_connector->panel.fixed_mode->clock;	130	return intel_connector->panel.fixed_mode->clock;
131	else	131	else
132	return mode->clock;	132	return mode->clock;
133	}	133	}
134		134
135	static int	135	static int
136	intel_dp_max_link_bw(struct intel_dp *intel_dp)	136	intel_dp_max_link_bw(struct intel_dp *intel_dp)
137	{	137	{
138	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];	138	int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
139		139
140	switch (max_link_bw) {	140	switch (max_link_bw) {
141	case DP_LINK_BW_1_62:	141	case DP_LINK_BW_1_62:
142	case DP_LINK_BW_2_7:	142	case DP_LINK_BW_2_7:
143	break;	143	break;
144	default:	144	default:
145	max_link_bw = DP_LINK_BW_1_62;	145	max_link_bw = DP_LINK_BW_1_62;
146	break;	146	break;
147	}	147	}
148	return max_link_bw;	148	return max_link_bw;
149	}	149	}
150		150
151	/*	151	/*
152	* The units on the numbers in the next two are... bizarre. Examples will	152	* The units on the numbers in the next two are... bizarre. Examples will
153	* make it clearer; this one parallels an example in the eDP spec.	153	* make it clearer; this one parallels an example in the eDP spec.
154	*	154	*
155	* intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:	155	* intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:
156	*	156	*
157	* 270000 * 1 * 8 / 10 == 216000	157	* 270000 * 1 * 8 / 10 == 216000
158	*	158	*
159	* The actual data capacity of that configuration is 2.16Gbit/s, so the	159	* The actual data capacity of that configuration is 2.16Gbit/s, so the
160	* units are decakilobits. ->clock in a drm_display_mode is in kilohertz -	160	* units are decakilobits. ->clock in a drm_display_mode is in kilohertz -
161	* or equivalently, kilopixels per second - so for 1680x1050R it'd be	161	* or equivalently, kilopixels per second - so for 1680x1050R it'd be
162	* 119000. At 18bpp that's 2142000 kilobits per second.	162	* 119000. At 18bpp that's 2142000 kilobits per second.
163	*	163	*
164	* Thus the strange-looking division by 10 in intel_dp_link_required, to	164	* Thus the strange-looking division by 10 in intel_dp_link_required, to
165	* get the result in decakilobits instead of kilobits.	165	* get the result in decakilobits instead of kilobits.
166	*/	166	*/
167		167
168	static int	168	static int
169	intel_dp_link_required(int pixel_clock, int bpp)	169	intel_dp_link_required(int pixel_clock, int bpp)
170	{	170	{
171	return (pixel_clock * bpp + 9) / 10;	171	return (pixel_clock * bpp + 9) / 10;
172	}	172	}
173		173
174	static int	174	static int
175	intel_dp_max_data_rate(int max_link_clock, int max_lanes)	175	intel_dp_max_data_rate(int max_link_clock, int max_lanes)
176	{	176	{
177	return (max_link_clock * max_lanes * 8) / 10;	177	return (max_link_clock * max_lanes * 8) / 10;
178	}	178	}
179		179
180	static bool	180	static bool
181	intel_dp_adjust_dithering(struct intel_dp *intel_dp,	181	intel_dp_adjust_dithering(struct intel_dp *intel_dp,
182	struct drm_display_mode *mode,	182	struct drm_display_mode *mode,
183	bool adjust_mode)	183	bool adjust_mode)
184	{	184	{
185	int max_link_clock =	185	int max_link_clock =
186	drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));	186	drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
187	int max_lanes = drm_dp_max_lane_count(intel_dp->dpcd);	187	int max_lanes = drm_dp_max_lane_count(intel_dp->dpcd);
188	int max_rate, mode_rate;	188	int max_rate, mode_rate;
189		189
190	mode_rate = intel_dp_link_required(mode->clock, 24);	190	mode_rate = intel_dp_link_required(mode->clock, 24);
191	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);	191	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
192		192
193	if (mode_rate > max_rate) {	193	if (mode_rate > max_rate) {
194	mode_rate = intel_dp_link_required(mode->clock, 18);	194	mode_rate = intel_dp_link_required(mode->clock, 18);
195	if (mode_rate > max_rate)	195	if (mode_rate > max_rate)
196	return false;	196	return false;
197		197
198	if (adjust_mode)	198	if (adjust_mode)
199	mode->private_flags	199	mode->private_flags
200	\|= INTEL_MODE_DP_FORCE_6BPC;	200	\|= INTEL_MODE_DP_FORCE_6BPC;
201		201
202	return true;	202	return true;
203	}	203	}
204		204
205	return true;	205	return true;
206	}	206	}
207		207
208	static int	208	static int
209	intel_dp_mode_valid(struct drm_connector *connector,	209	intel_dp_mode_valid(struct drm_connector *connector,
210	struct drm_display_mode *mode)	210	struct drm_display_mode *mode)
211	{	211	{
212	struct intel_dp *intel_dp = intel_attached_dp(connector);	212	struct intel_dp *intel_dp = intel_attached_dp(connector);
213	struct intel_connector *intel_connector = to_intel_connector(connector);	213	struct intel_connector *intel_connector = to_intel_connector(connector);
214	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;	214	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
215		215
216	if (is_edp(intel_dp) && fixed_mode) {	216	if (is_edp(intel_dp) && fixed_mode) {
217	if (mode->hdisplay > fixed_mode->hdisplay)	217	if (mode->hdisplay > fixed_mode->hdisplay)
218	return MODE_PANEL;	218	return MODE_PANEL;
219		219
220	if (mode->vdisplay > fixed_mode->vdisplay)	220	if (mode->vdisplay > fixed_mode->vdisplay)
221	return MODE_PANEL;	221	return MODE_PANEL;
222	}	222	}
223		223
224	if (!intel_dp_adjust_dithering(intel_dp, mode, false))	224	if (!intel_dp_adjust_dithering(intel_dp, mode, false))
225	return MODE_CLOCK_HIGH;	225	return MODE_CLOCK_HIGH;
226		226
227	if (mode->clock < 10000)	227	if (mode->clock < 10000)
228	return MODE_CLOCK_LOW;	228	return MODE_CLOCK_LOW;
229		229
230	if (mode->flags & DRM_MODE_FLAG_DBLCLK)	230	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
231	return MODE_H_ILLEGAL;	231	return MODE_H_ILLEGAL;
232		232
233	return MODE_OK;	233	return MODE_OK;
234	}	234	}
235		235
236	static uint32_t	236	static uint32_t
237	pack_aux(uint8_t *src, int src_bytes)	237	pack_aux(uint8_t *src, int src_bytes)
238	{	238	{
239	int i;	239	int i;
240	uint32_t v = 0;	240	uint32_t v = 0;
241		241
242	if (src_bytes > 4)	242	if (src_bytes > 4)
243	src_bytes = 4;	243	src_bytes = 4;
244	for (i = 0; i < src_bytes; i++)	244	for (i = 0; i < src_bytes; i++)
245	v \|= ((uint32_t) src[i]) << ((3-i) * 8);	245	v \|= ((uint32_t) src[i]) << ((3-i) * 8);
246	return v;	246	return v;
247	}	247	}
248		248
249	static void	249	static void
250	unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)	250	unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
251	{	251	{
252	int i;	252	int i;
253	if (dst_bytes > 4)	253	if (dst_bytes > 4)
254	dst_bytes = 4;	254	dst_bytes = 4;
255	for (i = 0; i < dst_bytes; i++)	255	for (i = 0; i < dst_bytes; i++)
256	dst[i] = src >> ((3-i) * 8);	256	dst[i] = src >> ((3-i) * 8);
257	}	257	}
258		258
259	/* hrawclock is 1/4 the FSB frequency */	259	/* hrawclock is 1/4 the FSB frequency */
260	static int	260	static int
261	intel_hrawclk(struct drm_device *dev)	261	intel_hrawclk(struct drm_device *dev)
262	{	262	{
263	struct drm_i915_private *dev_priv = dev->dev_private;	263	struct drm_i915_private *dev_priv = dev->dev_private;
264	uint32_t clkcfg;	264	uint32_t clkcfg;
265		265
266	/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */	266	/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */
267	if (IS_VALLEYVIEW(dev))	267	if (IS_VALLEYVIEW(dev))
268	return 200;	268	return 200;
269		269
270	clkcfg = I915_READ(CLKCFG);	270	clkcfg = I915_READ(CLKCFG);
271	switch (clkcfg & CLKCFG_FSB_MASK) {	271	switch (clkcfg & CLKCFG_FSB_MASK) {
272	case CLKCFG_FSB_400:	272	case CLKCFG_FSB_400:
273	return 100;	273	return 100;
274	case CLKCFG_FSB_533:	274	case CLKCFG_FSB_533:
275	return 133;	275	return 133;
276	case CLKCFG_FSB_667:	276	case CLKCFG_FSB_667:
277	return 166;	277	return 166;
278	case CLKCFG_FSB_800:	278	case CLKCFG_FSB_800:
279	return 200;	279	return 200;
280	case CLKCFG_FSB_1067:	280	case CLKCFG_FSB_1067:
281	return 266;	281	return 266;
282	case CLKCFG_FSB_1333:	282	case CLKCFG_FSB_1333:
283	return 333;	283	return 333;
284	/* these two are just a guess; one of them might be right */	284	/* these two are just a guess; one of them might be right */
285	case CLKCFG_FSB_1600:	285	case CLKCFG_FSB_1600:
286	case CLKCFG_FSB_1600_ALT:	286	case CLKCFG_FSB_1600_ALT:
287	return 400;	287	return 400;
288	default:	288	default:
289	return 133;	289	return 133;
290	}	290	}
291	}	291	}
292		292
293	static bool ironlake_edp_have_panel_power(struct intel_dp *intel_dp)	293	static bool ironlake_edp_have_panel_power(struct intel_dp *intel_dp)
294	{	294	{
295	struct drm_device *dev = intel_dp_to_dev(intel_dp);	295	struct drm_device *dev = intel_dp_to_dev(intel_dp);
296	struct drm_i915_private *dev_priv = dev->dev_private;	296	struct drm_i915_private *dev_priv = dev->dev_private;
297		297
298	return (I915_READ(PCH_PP_STATUS) & PP_ON) != 0;	298	return (I915_READ(PCH_PP_STATUS) & PP_ON) != 0;
299	}	299	}
300		300
301	static bool ironlake_edp_have_panel_vdd(struct intel_dp *intel_dp)	301	static bool ironlake_edp_have_panel_vdd(struct intel_dp *intel_dp)
302	{	302	{
303	struct drm_device *dev = intel_dp_to_dev(intel_dp);	303	struct drm_device *dev = intel_dp_to_dev(intel_dp);
304	struct drm_i915_private *dev_priv = dev->dev_private;	304	struct drm_i915_private *dev_priv = dev->dev_private;
305		305
306	return (I915_READ(PCH_PP_CONTROL) & EDP_FORCE_VDD) != 0;	306	return (I915_READ(PCH_PP_CONTROL) & EDP_FORCE_VDD) != 0;
307	}	307	}
308		308
309	static void	309	static void
310	intel_dp_check_edp(struct intel_dp *intel_dp)	310	intel_dp_check_edp(struct intel_dp *intel_dp)
311	{	311	{
312	struct drm_device *dev = intel_dp_to_dev(intel_dp);	312	struct drm_device *dev = intel_dp_to_dev(intel_dp);
313	struct drm_i915_private *dev_priv = dev->dev_private;	313	struct drm_i915_private *dev_priv = dev->dev_private;
314		314
315	if (!is_edp(intel_dp))	315	if (!is_edp(intel_dp))
316	return;	316	return;
317	if (!ironlake_edp_have_panel_power(intel_dp) && !ironlake_edp_have_panel_vdd(intel_dp)) {	317	if (!ironlake_edp_have_panel_power(intel_dp) && !ironlake_edp_have_panel_vdd(intel_dp)) {
318	WARN(1, "eDP powered off while attempting aux channel communication.\n");	318	WARN(1, "eDP powered off while attempting aux channel communication.\n");
319	DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",	319	DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",
320	I915_READ(PCH_PP_STATUS),	320	I915_READ(PCH_PP_STATUS),
321	I915_READ(PCH_PP_CONTROL));	321	I915_READ(PCH_PP_CONTROL));
322	}	322	}
323	}	323	}
324		324
325	static uint32_t	325	static uint32_t
326	intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)	326	intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
327	{	327	{
328	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	328	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
329	struct drm_device *dev = intel_dig_port->base.base.dev;	329	struct drm_device *dev = intel_dig_port->base.base.dev;
330	struct drm_i915_private *dev_priv = dev->dev_private;	330	struct drm_i915_private *dev_priv = dev->dev_private;
331	uint32_t ch_ctl = intel_dp->output_reg + 0x10;	331	uint32_t ch_ctl = intel_dp->output_reg + 0x10;
332	uint32_t status;	332	uint32_t status;
333	bool done;	333	bool done;
334		334
335	if (IS_HASWELL(dev)) {	335	if (IS_HASWELL(dev)) {
336	switch (intel_dig_port->port) {	336	switch (intel_dig_port->port) {
337	case PORT_A:	337	case PORT_A:
338	ch_ctl = DPA_AUX_CH_CTL;	338	ch_ctl = DPA_AUX_CH_CTL;
339	break;	339	break;
340	case PORT_B:	340	case PORT_B:
341	ch_ctl = PCH_DPB_AUX_CH_CTL;	341	ch_ctl = PCH_DPB_AUX_CH_CTL;
342	break;	342	break;
343	case PORT_C:	343	case PORT_C:
344	ch_ctl = PCH_DPC_AUX_CH_CTL;	344	ch_ctl = PCH_DPC_AUX_CH_CTL;
345	break;	345	break;
346	case PORT_D:	346	case PORT_D:
347	ch_ctl = PCH_DPD_AUX_CH_CTL;	347	ch_ctl = PCH_DPD_AUX_CH_CTL;
348	break;	348	break;
349	default:	349	default:
350	BUG();	350	BUG();
351	}	351	}
352	}	352	}
353		353
354	#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)	354	#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
355	if (has_aux_irq)	355	if (has_aux_irq)
356	done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,	356	done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
357	msecs_to_jiffies(10));	357	msecs_to_jiffies(10));
358	else	358	else
359	done = wait_for_atomic(C, 10) == 0;	359	done = wait_for_atomic(C, 10) == 0;
360	if (!done)	360	if (!done)
361	DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",	361	DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",
362	has_aux_irq);	362	has_aux_irq);
363	#undef C	363	#undef C
364		364
365	return status;	365	return status;
366	}	366	}
367		367
368	static int	368	static int
369	intel_dp_aux_ch(struct intel_dp *intel_dp,	369	intel_dp_aux_ch(struct intel_dp *intel_dp,
370	uint8_t *send, int send_bytes,	370	uint8_t *send, int send_bytes,
371	uint8_t *recv, int recv_size)	371	uint8_t *recv, int recv_size)
372	{	372	{
373	uint32_t output_reg = intel_dp->output_reg;	373	uint32_t output_reg = intel_dp->output_reg;
374	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);	374	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
375	struct drm_device *dev = intel_dig_port->base.base.dev;	375	struct drm_device *dev = intel_dig_port->base.base.dev;
376	struct drm_i915_private *dev_priv = dev->dev_private;	376	struct drm_i915_private *dev_priv = dev->dev_private;
377	uint32_t ch_ctl = output_reg + 0x10;	377	uint32_t ch_ctl = output_reg + 0x10;
378	uint32_t ch_data = ch_ctl + 4;	378	uint32_t ch_data = ch_ctl + 4;
379	int i, ret, recv_bytes;	379	int i, ret, recv_bytes;
380	uint32_t status;	380	uint32_t status;
381	uint32_t aux_clock_divider;	381	uint32_t aux_clock_divider;
382	int try, precharge;	382	int try, precharge;
383	bool has_aux_irq = INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev);	383	bool has_aux_irq = INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev);
384		384
385	/* dp aux is extremely sensitive to irq latency, hence request the	385	/* dp aux is extremely sensitive to irq latency, hence request the
386	* lowest possible wakeup latency and so prevent the cpu from going into	386	* lowest possible wakeup latency and so prevent the cpu from going into
387	* deep sleep states.	387	* deep sleep states.
388	*/	388	*/
389	// pm_qos_update_request(&dev_priv->pm_qos, 0);	389	// pm_qos_update_request(&dev_priv->pm_qos, 0);
390		390
391	if (IS_HASWELL(dev)) {	391	if (IS_HASWELL(dev)) {
392	switch (intel_dig_port->port) {	392	switch (intel_dig_port->port) {
393	case PORT_A:	393	case PORT_A:
394	ch_ctl = DPA_AUX_CH_CTL;	394	ch_ctl = DPA_AUX_CH_CTL;
395	ch_data = DPA_AUX_CH_DATA1;	395	ch_data = DPA_AUX_CH_DATA1;
396	break;	396	break;
397	case PORT_B:	397	case PORT_B:
398	ch_ctl = PCH_DPB_AUX_CH_CTL;	398	ch_ctl = PCH_DPB_AUX_CH_CTL;
399	ch_data = PCH_DPB_AUX_CH_DATA1;	399	ch_data = PCH_DPB_AUX_CH_DATA1;
400	break;	400	break;
401	case PORT_C:	401	case PORT_C:
402	ch_ctl = PCH_DPC_AUX_CH_CTL;	402	ch_ctl = PCH_DPC_AUX_CH_CTL;
403	ch_data = PCH_DPC_AUX_CH_DATA1;	403	ch_data = PCH_DPC_AUX_CH_DATA1;
404	break;	404	break;
405	case PORT_D:	405	case PORT_D:
406	ch_ctl = PCH_DPD_AUX_CH_CTL;	406	ch_ctl = PCH_DPD_AUX_CH_CTL;
407	ch_data = PCH_DPD_AUX_CH_DATA1;	407	ch_data = PCH_DPD_AUX_CH_DATA1;
408	break;	408	break;
409	default:	409	default:
410	BUG();	410	BUG();
411	}	411	}
412	}	412	}
413		413
414	intel_dp_check_edp(intel_dp);	414	intel_dp_check_edp(intel_dp);
415	/* The clock divider is based off the hrawclk,	415	/* The clock divider is based off the hrawclk,
416	* and would like to run at 2MHz. So, take the	416	* and would like to run at 2MHz. So, take the
417	* hrawclk value and divide by 2 and use that	417	* hrawclk value and divide by 2 and use that
418	*	418	*
419	* Note that PCH attached eDP panels should use a 125MHz input	419	* Note that PCH attached eDP panels should use a 125MHz input
420	* clock divider.	420	* clock divider.
421	*/	421	*/
422	if (is_cpu_edp(intel_dp)) {	422	if (is_cpu_edp(intel_dp)) {
423	if (HAS_DDI(dev))	423	if (HAS_DDI(dev))
424	aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;	424	aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;
425	else if (IS_VALLEYVIEW(dev))	425	else if (IS_VALLEYVIEW(dev))
426	aux_clock_divider = 100;	426	aux_clock_divider = 100;
427	else if (IS_GEN6(dev) \|\| IS_GEN7(dev))	427	else if (IS_GEN6(dev) \|\| IS_GEN7(dev))
428	aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */	428	aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
429	else	429	else
430	aux_clock_divider = 225; /* eDP input clock at 450Mhz */	430	aux_clock_divider = 225; /* eDP input clock at 450Mhz */
431	} else if (HAS_PCH_SPLIT(dev))	431	} else if (HAS_PCH_SPLIT(dev))
432	aux_clock_divider = DIV_ROUND_UP(intel_pch_rawclk(dev), 2);	432	aux_clock_divider = DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
433	else	433	else
434	aux_clock_divider = intel_hrawclk(dev) / 2;	434	aux_clock_divider = intel_hrawclk(dev) / 2;
435		435
436	if (IS_GEN6(dev))	436	if (IS_GEN6(dev))
437	precharge = 3;	437	precharge = 3;
438	else	438	else
439	precharge = 5;	439	precharge = 5;
440		440
441	/* Try to wait for any previous AUX channel activity */	441	/* Try to wait for any previous AUX channel activity */
442	for (try = 0; try < 3; try++) {	442	for (try = 0; try < 3; try++) {
443	status = I915_READ_NOTRACE(ch_ctl);	443	status = I915_READ_NOTRACE(ch_ctl);
444	if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)	444	if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
445	break;	445	break;
446	msleep(1);	446	msleep(1);
447	}	447	}
448		448
449	if (try == 3) {	449	if (try == 3) {
450	WARN(1, "dp_aux_ch not started status 0x%08x\n",	450	WARN(1, "dp_aux_ch not started status 0x%08x\n",
451	I915_READ(ch_ctl));	451	I915_READ(ch_ctl));
452	ret = -EBUSY;	452	ret = -EBUSY;
453	goto out;	453	goto out;
454	}	454	}
455		455
456	/* Must try at least 3 times according to DP spec */	456	/* Must try at least 3 times according to DP spec */
457	for (try = 0; try < 5; try++) {	457	for (try = 0; try < 5; try++) {
458	/* Load the send data into the aux channel data registers */	458	/* Load the send data into the aux channel data registers */
459	for (i = 0; i < send_bytes; i += 4)	459	for (i = 0; i < send_bytes; i += 4)
460	I915_WRITE(ch_data + i,	460	I915_WRITE(ch_data + i,
461	pack_aux(send + i, send_bytes - i));	461	pack_aux(send + i, send_bytes - i));
462		462
463	/* Send the command and wait for it to complete */	463	/* Send the command and wait for it to complete */
464	I915_WRITE(ch_ctl,	464	I915_WRITE(ch_ctl,
465	DP_AUX_CH_CTL_SEND_BUSY \|	465	DP_AUX_CH_CTL_SEND_BUSY \|
466	(has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) \|	466	(has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) \|
467	DP_AUX_CH_CTL_TIME_OUT_400us \|	467	DP_AUX_CH_CTL_TIME_OUT_400us \|
468	(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) \|	468	(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) \|
469	(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) \|	469	(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) \|
470	(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT) \|	470	(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT) \|
471	DP_AUX_CH_CTL_DONE \|	471	DP_AUX_CH_CTL_DONE \|
472	DP_AUX_CH_CTL_TIME_OUT_ERROR \|	472	DP_AUX_CH_CTL_TIME_OUT_ERROR \|
473	DP_AUX_CH_CTL_RECEIVE_ERROR);	473	DP_AUX_CH_CTL_RECEIVE_ERROR);
474		474
475	status = intel_dp_aux_wait_done(intel_dp, has_aux_irq);	475	status = intel_dp_aux_wait_done(intel_dp, has_aux_irq);
476		476
477	/* Clear done status and any errors */	477	/* Clear done status and any errors */
478	I915_WRITE(ch_ctl,	478	I915_WRITE(ch_ctl,
479	status \|	479	status \|
480	DP_AUX_CH_CTL_DONE \|	480	DP_AUX_CH_CTL_DONE \|
481	DP_AUX_CH_CTL_TIME_OUT_ERROR \|	481	DP_AUX_CH_CTL_TIME_OUT_ERROR \|
482	DP_AUX_CH_CTL_RECEIVE_ERROR);	482	DP_AUX_CH_CTL_RECEIVE_ERROR);
483		483
484	if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR \|	484	if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR \|
485	DP_AUX_CH_CTL_RECEIVE_ERROR))	485	DP_AUX_CH_CTL_RECEIVE_ERROR))
486	continue;	486	continue;
487	if (status & DP_AUX_CH_CTL_DONE)	487	if (status & DP_AUX_CH_CTL_DONE)
488	break;	488	break;
489	}	489	}
490		490
491	if ((status & DP_AUX_CH_CTL_DONE) == 0) {	491	if ((status & DP_AUX_CH_CTL_DONE) == 0) {
492	DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);	492	DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
493	ret = -EBUSY;	493	ret = -EBUSY;
494	goto out;	494	goto out;
495	}	495	}
496		496
497	/* Check for timeout or receive error.	497	/* Check for timeout or receive error.
498	* Timeouts occur when the sink is not connected	498	* Timeouts occur when the sink is not connected
499	*/	499	*/
500	if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {	500	if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/i915/intel_dp.c – Rev 3480 → 3482