Subversion Repositories Kolibri OS

/*

 * Copyright © 2013 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.

 *

 * Author: Jani Nikula 

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include "i915_drv.h"

#include "intel_drv.h"

#include "intel_dsi.h"

static const struct {

	u16 panel_id;

	struct drm_panel * (*init)(struct intel_dsi *intel_dsi, u16 panel_id);

} intel_dsi_drivers[] = {

	{

		.panel_id = MIPI_DSI_GENERIC_PANEL_ID,

		.init = vbt_panel_init,

	},

};

static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)

{

	struct drm_encoder *encoder = &intel_dsi->base.base;

	struct drm_device *dev = encoder->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 mask;

	mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |

		LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;

	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & mask) == mask, 100))

		DRM_ERROR("DPI FIFOs are not empty\n");

}

static void write_data(struct drm_i915_private *dev_priv, u32 reg,

		       const u8 *data, u32 len)

{

	u32 i, j;

	for (i = 0; i < len; i += 4) {

		u32 val = 0;

		for (j = 0; j < min_t(u32, len - i, 4); j++)

			val |= *data++ << 8 * j;

		I915_WRITE(reg, val);

	}

}

static void read_data(struct drm_i915_private *dev_priv, u32 reg,

		      u8 *data, u32 len)

{

	u32 i, j;

	for (i = 0; i < len; i += 4) {

		u32 val = I915_READ(reg);

		for (j = 0; j < min_t(u32, len - i, 4); j++)

			*data++ = val >> 8 * j;

	}

}

static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,

				       const struct mipi_dsi_msg *msg)

{

	struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);

	struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum port port = intel_dsi_host->port;

	struct mipi_dsi_packet packet;

	ssize_t ret;

	const u8 *header, *data;

	u32 data_reg, data_mask, ctrl_reg, ctrl_mask;

	ret = mipi_dsi_create_packet(&packet, msg);

	if (ret < 0)

		return ret;

	header = packet.header;

	data = packet.payload;

	if (msg->flags & MIPI_DSI_MSG_USE_LPM) {

		data_reg = MIPI_LP_GEN_DATA(port);

		data_mask = LP_DATA_FIFO_FULL;

		ctrl_reg = MIPI_LP_GEN_CTRL(port);

		ctrl_mask = LP_CTRL_FIFO_FULL;

	} else {

		data_reg = MIPI_HS_GEN_DATA(port);

		data_mask = HS_DATA_FIFO_FULL;

		ctrl_reg = MIPI_HS_GEN_CTRL(port);

		ctrl_mask = HS_CTRL_FIFO_FULL;

	}

	/* note: this is never true for reads */

	if (packet.payload_length) {

		if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & data_mask) == 0, 50))

			DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");

		write_data(dev_priv, data_reg, packet.payload,

			   packet.payload_length);

	}

	if (msg->rx_len) {

		I915_WRITE(MIPI_INTR_STAT(port), GEN_READ_DATA_AVAIL);

	}

	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & ctrl_mask) == 0, 50)) {

		DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");

	}

	I915_WRITE(ctrl_reg, header[2] << 16 | header[1] << 8 | header[0]);

	/* ->rx_len is set only for reads */

	if (msg->rx_len) {

		data_mask = GEN_READ_DATA_AVAIL;

		if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & data_mask) == data_mask, 50))

			DRM_ERROR("Timeout waiting for read data.\n");

		read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);

	}

	/* XXX: fix for reads and writes */

	return 4 + packet.payload_length;

}

static int intel_dsi_host_attach(struct mipi_dsi_host *host,

				 struct mipi_dsi_device *dsi)

{

	return 0;

}

static int intel_dsi_host_detach(struct mipi_dsi_host *host,

				 struct mipi_dsi_device *dsi)

{

	return 0;

}

static const struct mipi_dsi_host_ops intel_dsi_host_ops = {

	.attach = intel_dsi_host_attach,

	.detach = intel_dsi_host_detach,

	.transfer = intel_dsi_host_transfer,

};

static struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,

						  enum port port)

{

	struct intel_dsi_host *host;

	struct mipi_dsi_device *device;

	host = kzalloc(sizeof(*host), GFP_KERNEL);

	if (!host)

		return NULL;

	host->base.ops = &intel_dsi_host_ops;

	host->intel_dsi = intel_dsi;

	host->port = port;

	/*

	 * We should call mipi_dsi_host_register(&host->base) here, but we don't

	 * have a host->dev, and we don't have OF stuff either. So just use the

	 * dsi framework as a library and hope for the best. Create the dsi

	 * devices by ourselves here too. Need to be careful though, because we

	 * don't initialize any of the driver model devices here.

	 */

	device = kzalloc(sizeof(*device), GFP_KERNEL);

	if (!device) {

		kfree(host);

		return NULL;

	}

	device->host = &host->base;

	host->device = device;

	return host;

}

/*

 * send a video mode command

 *

 * XXX: commands with data in MIPI_DPI_DATA?

 */

static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,

			enum port port)

{

	struct drm_encoder *encoder = &intel_dsi->base.base;

	struct drm_device *dev = encoder->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 mask;

	/* XXX: pipe, hs */

	if (hs)

		cmd &= ~DPI_LP_MODE;

	else

		cmd |= DPI_LP_MODE;

	/* clear bit */

	I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);

	/* XXX: old code skips write if control unchanged */

	if (cmd == I915_READ(MIPI_DPI_CONTROL(port)))

		DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);

	I915_WRITE(MIPI_DPI_CONTROL(port), cmd);

	mask = SPL_PKT_SENT_INTERRUPT;

	if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & mask) == mask, 100))

		DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);

	return 0;

}

static void band_gap_reset(struct drm_i915_private *dev_priv)

{

	mutex_lock(&dev_priv->sb_lock);

	vlv_flisdsi_write(dev_priv, 0x08, 0x0001);

	vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);

	vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);

	udelay(150);

	vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);

	vlv_flisdsi_write(dev_priv, 0x08, 0x0000);

	mutex_unlock(&dev_priv->sb_lock);

}

static inline bool is_vid_mode(struct intel_dsi *intel_dsi)

{

	return intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE;

}

static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)

{

	return intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE;

}

static bool intel_dsi_compute_config(struct intel_encoder *encoder,

				     struct intel_crtc_state *config)

{

	struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,

						   base);

	struct intel_connector *intel_connector = intel_dsi->attached_connector;

	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;

	struct drm_display_mode *adjusted_mode = &config->base.adjusted_mode;

	DRM_DEBUG_KMS("\n");

	if (fixed_mode)

		intel_fixed_panel_mode(fixed_mode, adjusted_mode);

	/* DSI uses short packets for sync events, so clear mode flags for DSI */

	adjusted_mode->flags = 0;

	return true;

}

static void bxt_dsi_device_ready(struct intel_encoder *encoder)

{

	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 val;

	DRM_DEBUG_KMS("\n");

	/* Exit Low power state in 4 steps*/

	for_each_dsi_port(port, intel_dsi->ports) {

		/* 1. Enable MIPI PHY transparent latch */

		val = I915_READ(BXT_MIPI_PORT_CTRL(port));

		I915_WRITE(BXT_MIPI_PORT_CTRL(port), val | LP_OUTPUT_HOLD);

		usleep_range(2000, 2500);

		/* 2. Enter ULPS */

		val = I915_READ(MIPI_DEVICE_READY(port));

		val &= ~ULPS_STATE_MASK;

		val |= (ULPS_STATE_ENTER | DEVICE_READY);

		I915_WRITE(MIPI_DEVICE_READY(port), val);

		usleep_range(2, 3);

		/* 3. Exit ULPS */

		val = I915_READ(MIPI_DEVICE_READY(port));

		val &= ~ULPS_STATE_MASK;

		val |= (ULPS_STATE_EXIT | DEVICE_READY);

		I915_WRITE(MIPI_DEVICE_READY(port), val);

		usleep_range(1000, 1500);

		/* Clear ULPS and set device ready */

		val = I915_READ(MIPI_DEVICE_READY(port));

		val &= ~ULPS_STATE_MASK;

		val |= DEVICE_READY;

		I915_WRITE(MIPI_DEVICE_READY(port), val);

	}

}

static void vlv_dsi_device_ready(struct intel_encoder *encoder)

{

	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 val;

	DRM_DEBUG_KMS("\n");

	mutex_lock(&dev_priv->sb_lock);

	/* program rcomp for compliance, reduce from 50 ohms to 45 ohms

	 * needed everytime after power gate */

	vlv_flisdsi_write(dev_priv, 0x04, 0x0004);

	mutex_unlock(&dev_priv->sb_lock);

	/* bandgap reset is needed after everytime we do power gate */

	band_gap_reset(dev_priv);

	for_each_dsi_port(port, intel_dsi->ports) {

		I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_ENTER);

		usleep_range(2500, 3000);

		/* Enable MIPI PHY transparent latch

		 * Common bit for both MIPI Port A & MIPI Port C

		 * No similar bit in MIPI Port C reg

		 */

		val = I915_READ(MIPI_PORT_CTRL(PORT_A));

		I915_WRITE(MIPI_PORT_CTRL(PORT_A), val | LP_OUTPUT_HOLD);

		usleep_range(1000, 1500);

		I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_EXIT);

		usleep_range(2500, 3000);

		I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY);

		usleep_range(2500, 3000);

	}

}

static void intel_dsi_device_ready(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	if (IS_VALLEYVIEW(dev))

		vlv_dsi_device_ready(encoder);

	else if (IS_BROXTON(dev))

		bxt_dsi_device_ready(encoder);

}

static void intel_dsi_port_enable(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 temp;

	u32 port_ctrl;

	if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {

		temp = I915_READ(VLV_CHICKEN_3);

		temp &= ~PIXEL_OVERLAP_CNT_MASK |

					intel_dsi->pixel_overlap <<

					PIXEL_OVERLAP_CNT_SHIFT;

		I915_WRITE(VLV_CHICKEN_3, temp);

	}

	for_each_dsi_port(port, intel_dsi->ports) {

		port_ctrl = IS_BROXTON(dev) ? BXT_MIPI_PORT_CTRL(port) :

						MIPI_PORT_CTRL(port);

		temp = I915_READ(port_ctrl);

		temp &= ~LANE_CONFIGURATION_MASK;

		temp &= ~DUAL_LINK_MODE_MASK;

		if (intel_dsi->ports == ((1 << PORT_A) | (1 << PORT_C))) {

			temp |= (intel_dsi->dual_link - 1)

						<< DUAL_LINK_MODE_SHIFT;

			temp |= intel_crtc->pipe ?

					LANE_CONFIGURATION_DUAL_LINK_B :

					LANE_CONFIGURATION_DUAL_LINK_A;

		}

		/* assert ip_tg_enable signal */

		I915_WRITE(port_ctrl, temp | DPI_ENABLE);

		POSTING_READ(port_ctrl);

	}

}

static void intel_dsi_port_disable(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 temp;

	u32 port_ctrl;

	for_each_dsi_port(port, intel_dsi->ports) {

		/* de-assert ip_tg_enable signal */

		port_ctrl = IS_BROXTON(dev) ? BXT_MIPI_PORT_CTRL(port) :

						MIPI_PORT_CTRL(port);

		temp = I915_READ(port_ctrl);

		I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);

		POSTING_READ(port_ctrl);

	}

}

static void intel_dsi_enable(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	DRM_DEBUG_KMS("\n");

	if (is_cmd_mode(intel_dsi)) {

		for_each_dsi_port(port, intel_dsi->ports)

			I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);

	} else {

		msleep(20); /* XXX */

		for_each_dsi_port(port, intel_dsi->ports)

			dpi_send_cmd(intel_dsi, TURN_ON, false, port);

		msleep(100);

		drm_panel_enable(intel_dsi->panel);

		for_each_dsi_port(port, intel_dsi->ports)

			wait_for_dsi_fifo_empty(intel_dsi, port);

		intel_dsi_port_enable(encoder);

	}

	intel_panel_enable_backlight(intel_dsi->attached_connector);

}

static void intel_dsi_pre_enable(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);

	enum pipe pipe = intel_crtc->pipe;

	enum port port;

	u32 tmp;

	DRM_DEBUG_KMS("\n");

	/* Panel Enable over CRC PMIC */

	if (intel_dsi->gpio_panel)

		gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);

	msleep(intel_dsi->panel_on_delay);

	if (IS_VALLEYVIEW(dev)) {

		/*

		 * Disable DPOunit clock gating, can stall pipe

		 * and we need DPLL REFA always enabled

		 */

		tmp = I915_READ(DPLL(pipe));

		tmp |= DPLL_REF_CLK_ENABLE_VLV;

		I915_WRITE(DPLL(pipe), tmp);

		/* update the hw state for DPLL */

		intel_crtc->config->dpll_hw_state.dpll =

				DPLL_INTEGRATED_REF_CLK_VLV |

					DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;

		tmp = I915_READ(DSPCLK_GATE_D);

		tmp |= DPOUNIT_CLOCK_GATE_DISABLE;

		I915_WRITE(DSPCLK_GATE_D, tmp);

	}

	/* put device in ready state */

	intel_dsi_device_ready(encoder);

	drm_panel_prepare(intel_dsi->panel);

	for_each_dsi_port(port, intel_dsi->ports)

		wait_for_dsi_fifo_empty(intel_dsi, port);

	/* Enable port in pre-enable phase itself because as per hw team

	 * recommendation, port should be enabled befor plane & pipe */

	intel_dsi_enable(encoder);

}

static void intel_dsi_enable_nop(struct intel_encoder *encoder)

{

	DRM_DEBUG_KMS("\n");

	/* for DSI port enable has to be done before pipe

	 * and plane enable, so port enable is done in

	 * pre_enable phase itself unlike other encoders

	 */

}

static void intel_dsi_pre_disable(struct intel_encoder *encoder)

{

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	DRM_DEBUG_KMS("\n");

	intel_panel_disable_backlight(intel_dsi->attached_connector);

	if (is_vid_mode(intel_dsi)) {

		/* Send Shutdown command to the panel in LP mode */

		for_each_dsi_port(port, intel_dsi->ports)

			dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);

		msleep(10);

	}

}

static void intel_dsi_disable(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 temp;

	DRM_DEBUG_KMS("\n");

	if (is_vid_mode(intel_dsi)) {

		for_each_dsi_port(port, intel_dsi->ports)

			wait_for_dsi_fifo_empty(intel_dsi, port);

		intel_dsi_port_disable(encoder);

		msleep(2);

	}

	for_each_dsi_port(port, intel_dsi->ports) {

		/* Panel commands can be sent when clock is in LP11 */

		I915_WRITE(MIPI_DEVICE_READY(port), 0x0);

		intel_dsi_reset_clocks(encoder, port);

		I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);

		temp = I915_READ(MIPI_DSI_FUNC_PRG(port));

		temp &= ~VID_MODE_FORMAT_MASK;

		I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);

		I915_WRITE(MIPI_DEVICE_READY(port), 0x1);

	}

	/* if disable packets are sent before sending shutdown packet then in

	 * some next enable sequence send turn on packet error is observed */

	drm_panel_disable(intel_dsi->panel);

	for_each_dsi_port(port, intel_dsi->ports)

		wait_for_dsi_fifo_empty(intel_dsi, port);

}

static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;

	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	u32 val;

	u32 port_ctrl = 0;

	DRM_DEBUG_KMS("\n");

	for_each_dsi_port(port, intel_dsi->ports) {

		I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |

							ULPS_STATE_ENTER);

		usleep_range(2000, 2500);

		I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |

							ULPS_STATE_EXIT);

		usleep_range(2000, 2500);

		I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |

							ULPS_STATE_ENTER);

		usleep_range(2000, 2500);

		if (IS_BROXTON(dev))

			port_ctrl = BXT_MIPI_PORT_CTRL(port);

		else if (IS_VALLEYVIEW(dev))

			/* Common bit for both MIPI Port A & MIPI Port C */

			port_ctrl = MIPI_PORT_CTRL(PORT_A);

		/* Wait till Clock lanes are in LP-00 state for MIPI Port A

		 * only. MIPI Port C has no similar bit for checking

		 */

		if (wait_for(((I915_READ(port_ctrl) & AFE_LATCHOUT)

						== 0x00000), 30))

			DRM_ERROR("DSI LP not going Low\n");

		/* Disable MIPI PHY transparent latch */

		val = I915_READ(port_ctrl);

		I915_WRITE(port_ctrl, val & ~LP_OUTPUT_HOLD);

		usleep_range(1000, 1500);

		I915_WRITE(MIPI_DEVICE_READY(port), 0x00);

		usleep_range(2000, 2500);

	}

	intel_disable_dsi_pll(encoder);

}

static void intel_dsi_post_disable(struct intel_encoder *encoder)

{

	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	u32 val;

	DRM_DEBUG_KMS("\n");

	intel_dsi_disable(encoder);

	intel_dsi_clear_device_ready(encoder);

	val = I915_READ(DSPCLK_GATE_D);

	val &= ~DPOUNIT_CLOCK_GATE_DISABLE;

	I915_WRITE(DSPCLK_GATE_D, val);

	drm_panel_unprepare(intel_dsi->panel);

	msleep(intel_dsi->panel_off_delay);

	msleep(intel_dsi->panel_pwr_cycle_delay);

	/* Panel Disable over CRC PMIC */

	if (intel_dsi->gpio_panel)

		gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);

}

static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,

				   enum pipe *pipe)

{

	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	struct drm_device *dev = encoder->base.dev;

	enum intel_display_power_domain power_domain;

	u32 dpi_enabled, func, ctrl_reg;

	enum port port;

	DRM_DEBUG_KMS("\n");

	power_domain = intel_display_port_power_domain(encoder);

	if (!intel_display_power_is_enabled(dev_priv, power_domain))

		return false;

	/* XXX: this only works for one DSI output */

	for_each_dsi_port(port, intel_dsi->ports) {

		func = I915_READ(MIPI_DSI_FUNC_PRG(port));

		ctrl_reg = IS_BROXTON(dev) ? BXT_MIPI_PORT_CTRL(port) :

						MIPI_PORT_CTRL(port);

		dpi_enabled = I915_READ(ctrl_reg) & DPI_ENABLE;

		/* Due to some hardware limitations on BYT, MIPI Port C DPI

		 * Enable bit does not get set. To check whether DSI Port C

		 * was enabled in BIOS, check the Pipe B enable bit

		 */

		if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) &&

		    (port == PORT_C))

			dpi_enabled = I915_READ(PIPECONF(PIPE_B)) &

							PIPECONF_ENABLE;

		if (dpi_enabled || (func & CMD_MODE_DATA_WIDTH_MASK)) {

			if (I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY) {

				*pipe = port == PORT_A ? PIPE_A : PIPE_B;

				return true;

			}

		}

	}

	return false;

}

static void intel_dsi_get_config(struct intel_encoder *encoder,

				 struct intel_crtc_state *pipe_config)

{

	u32 pclk = 0;

	DRM_DEBUG_KMS("\n");

	/*

	 * DPLL_MD is not used in case of DSI, reading will get some default value

	 * set dpll_md = 0

	 */

	pipe_config->dpll_hw_state.dpll_md = 0;

	if (IS_BROXTON(encoder->base.dev))

		pclk = bxt_get_dsi_pclk(encoder, pipe_config->pipe_bpp);

	else if (IS_VALLEYVIEW(encoder->base.dev))

		pclk = vlv_get_dsi_pclk(encoder, pipe_config->pipe_bpp);

	if (!pclk)

		return;

	pipe_config->base.adjusted_mode.crtc_clock = pclk;

	pipe_config->port_clock = pclk;

}

static enum drm_mode_status

intel_dsi_mode_valid(struct drm_connector *connector,

		     struct drm_display_mode *mode)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;

	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;

	DRM_DEBUG_KMS("\n");

	if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {

		DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");

		return MODE_NO_DBLESCAN;

	}

	if (fixed_mode) {

		if (mode->hdisplay > fixed_mode->hdisplay)

			return MODE_PANEL;

		if (mode->vdisplay > fixed_mode->vdisplay)

			return MODE_PANEL;

		if (fixed_mode->clock > max_dotclk)

			return MODE_CLOCK_HIGH;

	}

	return MODE_OK;

}

/* return txclkesc cycles in terms of divider and duration in us */

static u16 txclkesc(u32 divider, unsigned int us)

{

	switch (divider) {

	case ESCAPE_CLOCK_DIVIDER_1:

	default:

		return 20 * us;

	case ESCAPE_CLOCK_DIVIDER_2:

		return 10 * us;

	case ESCAPE_CLOCK_DIVIDER_4:

		return 5 * us;

	}

}

/* return pixels in terms of txbyteclkhs */

static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,

		       u16 burst_mode_ratio)

{

	return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,

					 8 * 100), lane_count);

}

static void set_dsi_timings(struct drm_encoder *encoder,

			    const struct drm_display_mode *adjusted_mode)

{

	struct drm_device *dev = encoder->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

	enum port port;

	unsigned int bpp = intel_crtc->config->pipe_bpp;

	unsigned int lane_count = intel_dsi->lane_count;

	u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;

	hactive = adjusted_mode->crtc_hdisplay;

	hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;

	hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;

	hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;

	if (intel_dsi->dual_link) {

		hactive /= 2;

		if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)

			hactive += intel_dsi->pixel_overlap;

		hfp /= 2;

		hsync /= 2;

		hbp /= 2;

	}

	vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;

	vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;

	vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;

	/* horizontal values are in terms of high speed byte clock */

	hactive = txbyteclkhs(hactive, bpp, lane_count,

			      intel_dsi->burst_mode_ratio);

	hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);

	hsync = txbyteclkhs(hsync, bpp, lane_count,

			    intel_dsi->burst_mode_ratio);

	hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);

	for_each_dsi_port(port, intel_dsi->ports) {

		if (IS_BROXTON(dev)) {

			/*

			 * Program hdisplay and vdisplay on MIPI transcoder.

			 * This is different from calculated hactive and

			 * vactive, as they are calculated per channel basis,

			 * whereas these values should be based on resolution.

			 */

			I915_WRITE(BXT_MIPI_TRANS_HACTIVE(port),

				   adjusted_mode->crtc_hdisplay);

			I915_WRITE(BXT_MIPI_TRANS_VACTIVE(port),

				   adjusted_mode->crtc_vdisplay);

			I915_WRITE(BXT_MIPI_TRANS_VTOTAL(port),

				   adjusted_mode->crtc_vtotal);

		}

		I915_WRITE(MIPI_HACTIVE_AREA_COUNT(port), hactive);

		I915_WRITE(MIPI_HFP_COUNT(port), hfp);

		/* meaningful for video mode non-burst sync pulse mode only,

		 * can be zero for non-burst sync events and burst modes */

		I915_WRITE(MIPI_HSYNC_PADDING_COUNT(port), hsync);

		I915_WRITE(MIPI_HBP_COUNT(port), hbp);

		/* vertical values are in terms of lines */

		I915_WRITE(MIPI_VFP_COUNT(port), vfp);

		I915_WRITE(MIPI_VSYNC_PADDING_COUNT(port), vsync);

		I915_WRITE(MIPI_VBP_COUNT(port), vbp);

	}

}

static void intel_dsi_prepare(struct intel_encoder *intel_encoder)

{

	struct drm_encoder *encoder = &intel_encoder->base;

	struct drm_device *dev = encoder->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;

	enum port port;

	unsigned int bpp = intel_crtc->config->pipe_bpp;

	u32 val, tmp;

	u16 mode_hdisplay;

	DRM_DEBUG_KMS("pipe %c\n", pipe_name(intel_crtc->pipe));

	mode_hdisplay = adjusted_mode->crtc_hdisplay;

	if (intel_dsi->dual_link) {

		mode_hdisplay /= 2;

		if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)

			mode_hdisplay += intel_dsi->pixel_overlap;

	}

	for_each_dsi_port(port, intel_dsi->ports) {

		if (IS_VALLEYVIEW(dev)) {

			/*

			 * escape clock divider, 20MHz, shared for A and C.

			 * device ready must be off when doing this! txclkesc?

			 */

			tmp = I915_READ(MIPI_CTRL(PORT_A));

			tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;

			I915_WRITE(MIPI_CTRL(PORT_A), tmp |

					ESCAPE_CLOCK_DIVIDER_1);

			/* read request priority is per pipe */

			tmp = I915_READ(MIPI_CTRL(port));

			tmp &= ~READ_REQUEST_PRIORITY_MASK;

			I915_WRITE(MIPI_CTRL(port), tmp |

					READ_REQUEST_PRIORITY_HIGH);

		} else if (IS_BROXTON(dev)) {

			/*

			 * FIXME:

			 * BXT can connect any PIPE to any MIPI port.

			 * Select the pipe based on the MIPI port read from

			 * VBT for now. Pick PIPE A for MIPI port A and C

			 * for port C.

			 */

			tmp = I915_READ(MIPI_CTRL(port));

			tmp &= ~BXT_PIPE_SELECT_MASK;

			if (port == PORT_A)

				tmp |= BXT_PIPE_SELECT_A;

			else if (port == PORT_C)

				tmp |= BXT_PIPE_SELECT_C;

			I915_WRITE(MIPI_CTRL(port), tmp);

		}

		/* XXX: why here, why like this? handling in irq handler?! */

		I915_WRITE(MIPI_INTR_STAT(port), 0xffffffff);

		I915_WRITE(MIPI_INTR_EN(port), 0xffffffff);

		I915_WRITE(MIPI_DPHY_PARAM(port), intel_dsi->dphy_reg);

		I915_WRITE(MIPI_DPI_RESOLUTION(port),

			adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT |

			mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);

	}

	set_dsi_timings(encoder, adjusted_mode);

	val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;

	if (is_cmd_mode(intel_dsi)) {

		val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;

		val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */

	} else {

		val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;

		/* XXX: cross-check bpp vs. pixel format? */

		val |= intel_dsi->pixel_format;

	}

	tmp = 0;

	if (intel_dsi->eotp_pkt == 0)

		tmp |= EOT_DISABLE;

	if (intel_dsi->clock_stop)

		tmp |= CLOCKSTOP;

	for_each_dsi_port(port, intel_dsi->ports) {

		I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);

		/* timeouts for recovery. one frame IIUC. if counter expires,

		 * EOT and stop state. */

		/*

		 * In burst mode, value greater than one DPI line Time in byte

		 * clock (txbyteclkhs) To timeout this timer 1+ of the above

		 * said value is recommended.

		 *

		 * In non-burst mode, Value greater than one DPI frame time in

		 * byte clock(txbyteclkhs) To timeout this timer 1+ of the above

		 * said value is recommended.

		 *

		 * In DBI only mode, value greater than one DBI frame time in

		 * byte clock(txbyteclkhs) To timeout this timer 1+ of the above

		 * said value is recommended.

		 */

		if (is_vid_mode(intel_dsi) &&

			intel_dsi->video_mode_format == VIDEO_MODE_BURST) {

			I915_WRITE(MIPI_HS_TX_TIMEOUT(port),

				txbyteclkhs(adjusted_mode->crtc_htotal, bpp,

					    intel_dsi->lane_count,

					    intel_dsi->burst_mode_ratio) + 1);

		} else {

			I915_WRITE(MIPI_HS_TX_TIMEOUT(port),

				txbyteclkhs(adjusted_mode->crtc_vtotal *

					    adjusted_mode->crtc_htotal,

					    bpp, intel_dsi->lane_count,

					    intel_dsi->burst_mode_ratio) + 1);

		}

		I915_WRITE(MIPI_LP_RX_TIMEOUT(port), intel_dsi->lp_rx_timeout);

		I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(port),

						intel_dsi->turn_arnd_val);

		I915_WRITE(MIPI_DEVICE_RESET_TIMER(port),

						intel_dsi->rst_timer_val);

		/* dphy stuff */

		/* in terms of low power clock */

		I915_WRITE(MIPI_INIT_COUNT(port),

				txclkesc(intel_dsi->escape_clk_div, 100));

		if (IS_BROXTON(dev) && (!intel_dsi->dual_link)) {

			/*

			 * BXT spec says write MIPI_INIT_COUNT for

			 * both the ports, even if only one is

			 * getting used. So write the other port

			 * if not in dual link mode.

			 */

			I915_WRITE(MIPI_INIT_COUNT(port ==

						PORT_A ? PORT_C : PORT_A),

					intel_dsi->init_count);

		}

		/* recovery disables */

		I915_WRITE(MIPI_EOT_DISABLE(port), tmp);

		/* in terms of low power clock */

		I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);

		/* in terms of txbyteclkhs. actual high to low switch +

		 * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.

		 *

		 * XXX: write MIPI_STOP_STATE_STALL?

		 */

		I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(port),

						intel_dsi->hs_to_lp_count);

		/* XXX: low power clock equivalence in terms of byte clock.

		 * the number of byte clocks occupied in one low power clock.

		 * based on txbyteclkhs and txclkesc.

		 * txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL

		 * ) / 105.???

		 */

		I915_WRITE(MIPI_LP_BYTECLK(port), intel_dsi->lp_byte_clk);

		/* the bw essential for transmitting 16 long packets containing

		 * 252 bytes meant for dcs write memory command is programmed in

		 * this register in terms of byte clocks. based on dsi transfer

		 * rate and the number of lanes configured the time taken to

		 * transmit 16 long packets in a dsi stream varies. */

		I915_WRITE(MIPI_DBI_BW_CTRL(port), intel_dsi->bw_timer);

		I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(port),

		intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT |

		intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);

		if (is_vid_mode(intel_dsi))

			/* Some panels might have resolution which is not a

			 * multiple of 64 like 1366 x 768. Enable RANDOM

			 * resolution support for such panels by default */

			I915_WRITE(MIPI_VIDEO_MODE_FORMAT(port),

				intel_dsi->video_frmt_cfg_bits |

				intel_dsi->video_mode_format |

				IP_TG_CONFIG |

				RANDOM_DPI_DISPLAY_RESOLUTION);

	}

}

static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)

{

	DRM_DEBUG_KMS("\n");

	intel_dsi_prepare(encoder);

	intel_enable_dsi_pll(encoder);

}

static enum drm_connector_status

intel_dsi_detect(struct drm_connector *connector, bool force)

{

	return connector_status_connected;

}

static int intel_dsi_get_modes(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct drm_display_mode *mode;

	DRM_DEBUG_KMS("\n");

	if (!intel_connector->panel.fixed_mode) {

		DRM_DEBUG_KMS("no fixed mode\n");

		return 0;

	}

	mode = drm_mode_duplicate(connector->dev,

				  intel_connector->panel.fixed_mode);

	if (!mode) {

		DRM_DEBUG_KMS("drm_mode_duplicate failed\n");

		return 0;

	}

	drm_mode_probed_add(connector, mode);

	return 1;

}

static void intel_dsi_connector_destroy(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	DRM_DEBUG_KMS("\n");

	intel_panel_fini(&intel_connector->panel);

	drm_connector_cleanup(connector);

	kfree(connector);

}

static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)

{

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

	if (intel_dsi->panel) {

		drm_panel_detach(intel_dsi->panel);

		/* XXX: Logically this call belongs in the panel driver. */

		drm_panel_remove(intel_dsi->panel);

	}

	/* dispose of the gpios */

	if (intel_dsi->gpio_panel)

		gpiod_put(intel_dsi->gpio_panel);

	intel_encoder_destroy(encoder);

}