intel_dp.c 34.7 KB
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/*
 * 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 <keithp@keithp.com>
 *
 */

#include <linux/i2c.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "intel_dp.h"

#define DP_LINK_STATUS_SIZE	6
#define DP_LINK_CHECK_TIMEOUT	(10 * 1000)

#define DP_LINK_CONFIGURATION_SIZE	9

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#define IS_eDP(i) ((i)->type == INTEL_OUTPUT_EDP)

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struct intel_dp_priv {
	uint32_t output_reg;
	uint32_t DP;
	uint8_t  link_configuration[DP_LINK_CONFIGURATION_SIZE];
	uint32_t save_DP;
	uint8_t  save_link_configuration[DP_LINK_CONFIGURATION_SIZE];
	bool has_audio;
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	int dpms_mode;
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	uint8_t link_bw;
	uint8_t lane_count;
	uint8_t dpcd[4];
	struct intel_output *intel_output;
	struct i2c_adapter adapter;
	struct i2c_algo_dp_aux_data algo;
};

static void
intel_dp_link_train(struct intel_output *intel_output, uint32_t DP,
		    uint8_t link_configuration[DP_LINK_CONFIGURATION_SIZE]);

static void
intel_dp_link_down(struct intel_output *intel_output, uint32_t DP);

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void
intel_edp_link_config (struct intel_output *intel_output,
		int *lane_num, int *link_bw)
{
	struct intel_dp_priv   *dp_priv = intel_output->dev_priv;

	*lane_num = dp_priv->lane_count;
	if (dp_priv->link_bw == DP_LINK_BW_1_62)
		*link_bw = 162000;
	else if (dp_priv->link_bw == DP_LINK_BW_2_7)
		*link_bw = 270000;
}

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static int
intel_dp_max_lane_count(struct intel_output *intel_output)
{
	struct intel_dp_priv   *dp_priv = intel_output->dev_priv;
	int max_lane_count = 4;

	if (dp_priv->dpcd[0] >= 0x11) {
		max_lane_count = dp_priv->dpcd[2] & 0x1f;
		switch (max_lane_count) {
		case 1: case 2: case 4:
			break;
		default:
			max_lane_count = 4;
		}
	}
	return max_lane_count;
}

static int
intel_dp_max_link_bw(struct intel_output *intel_output)
{
	struct intel_dp_priv   *dp_priv = intel_output->dev_priv;
	int max_link_bw = dp_priv->dpcd[1];

	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;
}

static int
intel_dp_link_clock(uint8_t link_bw)
{
	if (link_bw == DP_LINK_BW_2_7)
		return 270000;
	else
		return 162000;
}

/* I think this is a fiction */
static int
intel_dp_link_required(int pixel_clock)
{
	return pixel_clock * 3;
}

static int
intel_dp_mode_valid(struct drm_connector *connector,
		    struct drm_display_mode *mode)
{
	struct intel_output *intel_output = to_intel_output(connector);
	int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_output));
	int max_lanes = intel_dp_max_lane_count(intel_output);

	if (intel_dp_link_required(mode->clock) > max_link_clock * max_lanes)
		return MODE_CLOCK_HIGH;

	if (mode->clock < 10000)
		return MODE_CLOCK_LOW;

	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);
}

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/* 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;

	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;
	}
}

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static int
intel_dp_aux_ch(struct intel_output *intel_output,
		uint8_t *send, int send_bytes,
		uint8_t *recv, int recv_size)
{
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	uint32_t output_reg = dp_priv->output_reg;
	struct drm_device *dev = intel_output->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;
	int recv_bytes;
	uint32_t ctl;
	uint32_t status;
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	uint32_t aux_clock_divider;
	int try;
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	/* The clock divider is based off the hrawclk,
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	 * and would like to run at 2MHz. So, take the
	 * hrawclk value and divide by 2 and use that
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	 */
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	if (IS_eDP(intel_output))
		aux_clock_divider = 225; /* eDP input clock at 450Mhz */
	else if (IS_IGDNG(dev))
		aux_clock_divider = 62; /* IGDNG: input clock fixed at 125Mhz */
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	else
		aux_clock_divider = intel_hrawclk(dev) / 2;

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	/* 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) {
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			uint32_t    d = pack_aux(send + i, send_bytes - i);
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			I915_WRITE(ch_data + i, d);
		}
	
		ctl = (DP_AUX_CH_CTL_SEND_BUSY |
		       DP_AUX_CH_CTL_TIME_OUT_400us |
		       (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
		       (5 << 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);
	
		/* Send the command and wait for it to complete */
		I915_WRITE(ch_ctl, ctl);
		(void) I915_READ(ch_ctl);
		for (;;) {
			udelay(100);
			status = I915_READ(ch_ctl);
			if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
				break;
		}
	
		/* Clear done status and any errors */
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		I915_WRITE(ch_ctl, (status |
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				DP_AUX_CH_CTL_DONE |
				DP_AUX_CH_CTL_TIME_OUT_ERROR |
				DP_AUX_CH_CTL_RECEIVE_ERROR));
		(void) I915_READ(ch_ctl);
		if ((status & DP_AUX_CH_CTL_TIME_OUT_ERROR) == 0)
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			break;
	}

	if ((status & DP_AUX_CH_CTL_DONE) == 0) {
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		DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
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		return -EBUSY;
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	}

	/* Check for timeout or receive error.
	 * Timeouts occur when the sink is not connected
	 */
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	if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
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		DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
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		return -EIO;
	}
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	/* Timeouts occur when the device isn't connected, so they're
	 * "normal" -- don't fill the kernel log with these */
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	if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
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		DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
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		return -ETIMEDOUT;
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	}

	/* 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) {
		uint32_t    d = I915_READ(ch_data + i);

		unpack_aux(d, recv + i, recv_bytes - i);
	}

	return recv_bytes;
}

/* Write data to the aux channel in native mode */
static int
intel_dp_aux_native_write(struct intel_output *intel_output,
			  uint16_t address, uint8_t *send, int send_bytes)
{
	int ret;
	uint8_t	msg[20];
	int msg_bytes;
	uint8_t	ack;

	if (send_bytes > 16)
		return -1;
	msg[0] = AUX_NATIVE_WRITE << 4;
	msg[1] = address >> 8;
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	msg[2] = address & 0xff;
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	msg[3] = send_bytes - 1;
	memcpy(&msg[4], send, send_bytes);
	msg_bytes = send_bytes + 4;
	for (;;) {
		ret = intel_dp_aux_ch(intel_output, 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
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			return -EIO;
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	}
	return send_bytes;
}

/* Write a single byte to the aux channel in native mode */
static int
intel_dp_aux_native_write_1(struct intel_output *intel_output,
			    uint16_t address, uint8_t byte)
{
	return intel_dp_aux_native_write(intel_output, address, &byte, 1);
}

/* read bytes from a native aux channel */
static int
intel_dp_aux_native_read(struct intel_output *intel_output,
			 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;

	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_output, msg, msg_bytes,
				      reply, reply_bytes);
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		if (ret == 0)
			return -EPROTO;
		if (ret < 0)
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			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
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			return -EIO;
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	}
}

static int
intel_dp_i2c_aux_ch(struct i2c_adapter *adapter,
		    uint8_t *send, int send_bytes,
		    uint8_t *recv, int recv_bytes)
{
	struct intel_dp_priv *dp_priv = container_of(adapter,
						     struct intel_dp_priv,
						     adapter);
	struct intel_output *intel_output = dp_priv->intel_output;

	return intel_dp_aux_ch(intel_output,
			       send, send_bytes, recv, recv_bytes);
}

static int
intel_dp_i2c_init(struct intel_output *intel_output, const char *name)
{
	struct intel_dp_priv   *dp_priv = intel_output->dev_priv;

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Zhenyu Wang 已提交
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	DRM_DEBUG_KMS("i2c_init %s\n", name);
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	dp_priv->algo.running = false;
	dp_priv->algo.address = 0;
	dp_priv->algo.aux_ch = intel_dp_i2c_aux_ch;

	memset(&dp_priv->adapter, '\0', sizeof (dp_priv->adapter));
	dp_priv->adapter.owner = THIS_MODULE;
	dp_priv->adapter.class = I2C_CLASS_DDC;
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	strncpy (dp_priv->adapter.name, name, sizeof(dp_priv->adapter.name) - 1);
	dp_priv->adapter.name[sizeof(dp_priv->adapter.name) - 1] = '\0';
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	dp_priv->adapter.algo_data = &dp_priv->algo;
	dp_priv->adapter.dev.parent = &intel_output->base.kdev;
	
	return i2c_dp_aux_add_bus(&dp_priv->adapter);
}

static bool
intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
		    struct drm_display_mode *adjusted_mode)
{
	struct intel_output *intel_output = enc_to_intel_output(encoder);
	struct intel_dp_priv   *dp_priv = intel_output->dev_priv;
	int lane_count, clock;
	int max_lane_count = intel_dp_max_lane_count(intel_output);
	int max_clock = intel_dp_max_link_bw(intel_output) == DP_LINK_BW_2_7 ? 1 : 0;
	static int bws[2] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7 };

	for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
		for (clock = 0; clock <= max_clock; clock++) {
			int link_avail = intel_dp_link_clock(bws[clock]) * lane_count;

			if (intel_dp_link_required(mode->clock) <= link_avail) {
				dp_priv->link_bw = bws[clock];
				dp_priv->lane_count = lane_count;
				adjusted_mode->clock = intel_dp_link_clock(dp_priv->link_bw);
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				DRM_DEBUG_KMS("Display port link bw %02x lane "
						"count %d clock %d\n",
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				       dp_priv->link_bw, dp_priv->lane_count,
				       adjusted_mode->clock);
				return true;
			}
		}
	}
	return false;
}

struct intel_dp_m_n {
	uint32_t	tu;
	uint32_t	gmch_m;
	uint32_t	gmch_n;
	uint32_t	link_m;
	uint32_t	link_n;
};

static void
intel_reduce_ratio(uint32_t *num, uint32_t *den)
{
	while (*num > 0xffffff || *den > 0xffffff) {
		*num >>= 1;
		*den >>= 1;
	}
}

static void
intel_dp_compute_m_n(int bytes_per_pixel,
		     int nlanes,
		     int pixel_clock,
		     int link_clock,
		     struct intel_dp_m_n *m_n)
{
	m_n->tu = 64;
	m_n->gmch_m = pixel_clock * bytes_per_pixel;
	m_n->gmch_n = link_clock * nlanes;
	intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
	m_n->link_m = pixel_clock;
	m_n->link_n = link_clock;
	intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
}

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 drm_mode_config *mode_config = &dev->mode_config;
	struct drm_connector *connector;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int lane_count = 4;
	struct intel_dp_m_n m_n;

	/*
	 * Find the lane count in the intel_output private
	 */
	list_for_each_entry(connector, &mode_config->connector_list, head) {
		struct intel_output *intel_output = to_intel_output(connector);
		struct intel_dp_priv *dp_priv = intel_output->dev_priv;

		if (!connector->encoder || connector->encoder->crtc != crtc)
			continue;

		if (intel_output->type == INTEL_OUTPUT_DISPLAYPORT) {
			lane_count = dp_priv->lane_count;
			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_dp_compute_m_n(3, lane_count,
			     mode->clock, adjusted_mode->clock, &m_n);

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	if (IS_IGDNG(dev)) {
		if (intel_crtc->pipe == 0) {
			I915_WRITE(TRANSA_DATA_M1,
				   ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
				   m_n.gmch_m);
			I915_WRITE(TRANSA_DATA_N1, m_n.gmch_n);
			I915_WRITE(TRANSA_DP_LINK_M1, m_n.link_m);
			I915_WRITE(TRANSA_DP_LINK_N1, m_n.link_n);
		} else {
			I915_WRITE(TRANSB_DATA_M1,
				   ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
				   m_n.gmch_m);
			I915_WRITE(TRANSB_DATA_N1, m_n.gmch_n);
			I915_WRITE(TRANSB_DP_LINK_M1, m_n.link_m);
			I915_WRITE(TRANSB_DP_LINK_N1, m_n.link_n);
		}
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	} else {
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		if (intel_crtc->pipe == 0) {
			I915_WRITE(PIPEA_GMCH_DATA_M,
				   ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
				   m_n.gmch_m);
			I915_WRITE(PIPEA_GMCH_DATA_N,
				   m_n.gmch_n);
			I915_WRITE(PIPEA_DP_LINK_M, m_n.link_m);
			I915_WRITE(PIPEA_DP_LINK_N, m_n.link_n);
		} else {
			I915_WRITE(PIPEB_GMCH_DATA_M,
				   ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
				   m_n.gmch_m);
			I915_WRITE(PIPEB_GMCH_DATA_N,
					m_n.gmch_n);
			I915_WRITE(PIPEB_DP_LINK_M, m_n.link_m);
			I915_WRITE(PIPEB_DP_LINK_N, m_n.link_n);
		}
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	}
}

static void
intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
		  struct drm_display_mode *adjusted_mode)
{
	struct intel_output *intel_output = enc_to_intel_output(encoder);
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	struct drm_crtc *crtc = intel_output->enc.crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	dp_priv->DP = (DP_LINK_TRAIN_OFF |
			DP_VOLTAGE_0_4 |
			DP_PRE_EMPHASIS_0 |
			DP_SYNC_VS_HIGH |
			DP_SYNC_HS_HIGH);

	switch (dp_priv->lane_count) {
	case 1:
		dp_priv->DP |= DP_PORT_WIDTH_1;
		break;
	case 2:
		dp_priv->DP |= DP_PORT_WIDTH_2;
		break;
	case 4:
		dp_priv->DP |= DP_PORT_WIDTH_4;
		break;
	}
	if (dp_priv->has_audio)
		dp_priv->DP |= DP_AUDIO_OUTPUT_ENABLE;

	memset(dp_priv->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
	dp_priv->link_configuration[0] = dp_priv->link_bw;
	dp_priv->link_configuration[1] = dp_priv->lane_count;

	/*
	 * Check for DPCD version > 1.1,
	 * enable enahanced frame stuff in that case
	 */
	if (dp_priv->dpcd[0] >= 0x11) {
		dp_priv->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
		dp_priv->DP |= DP_ENHANCED_FRAMING;
	}

	if (intel_crtc->pipe == 1)
		dp_priv->DP |= DP_PIPEB_SELECT;
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	if (IS_eDP(intel_output)) {
		/* don't miss out required setting for eDP */
		dp_priv->DP |= DP_PLL_ENABLE;
		if (adjusted_mode->clock < 200000)
			dp_priv->DP |= DP_PLL_FREQ_160MHZ;
		else
			dp_priv->DP |= DP_PLL_FREQ_270MHZ;
	}
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}

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static void igdng_edp_backlight_on (struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;

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	DRM_DEBUG_KMS("\n");
616 617 618 619 620 621 622 623 624 625
	pp = I915_READ(PCH_PP_CONTROL);
	pp |= EDP_BLC_ENABLE;
	I915_WRITE(PCH_PP_CONTROL, pp);
}

static void igdng_edp_backlight_off (struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp;

626
	DRM_DEBUG_KMS("\n");
627 628 629 630
	pp = I915_READ(PCH_PP_CONTROL);
	pp &= ~EDP_BLC_ENABLE;
	I915_WRITE(PCH_PP_CONTROL, pp);
}
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static void
intel_dp_dpms(struct drm_encoder *encoder, int mode)
{
	struct intel_output *intel_output = enc_to_intel_output(encoder);
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t dp_reg = I915_READ(dp_priv->output_reg);

	if (mode != DRM_MODE_DPMS_ON) {
642
		if (dp_reg & DP_PORT_EN) {
643
			intel_dp_link_down(intel_output, dp_priv->DP);
644 645 646
			if (IS_eDP(intel_output))
				igdng_edp_backlight_off(dev);
		}
647
	} else {
648
		if (!(dp_reg & DP_PORT_EN)) {
649
			intel_dp_link_train(intel_output, dp_priv->DP, dp_priv->link_configuration);
650 651 652
			if (IS_eDP(intel_output))
				igdng_edp_backlight_on(dev);
		}
653
	}
654
	dp_priv->dpms_mode = mode;
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}

/*
 * Fetch AUX CH registers 0x202 - 0x207 which contain
 * link status information
 */
static bool
intel_dp_get_link_status(struct intel_output *intel_output,
			 uint8_t link_status[DP_LINK_STATUS_SIZE])
{
	int ret;

	ret = intel_dp_aux_native_read(intel_output,
				       DP_LANE0_1_STATUS,
				       link_status, DP_LINK_STATUS_SIZE);
	if (ret != DP_LINK_STATUS_SIZE)
		return false;
	return true;
}

static uint8_t
intel_dp_link_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
		     int r)
{
	return link_status[r - DP_LANE0_1_STATUS];
}

static void
intel_dp_save(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;

	dp_priv->save_DP = I915_READ(dp_priv->output_reg);
	intel_dp_aux_native_read(intel_output, DP_LINK_BW_SET,
				 dp_priv->save_link_configuration,
				 sizeof (dp_priv->save_link_configuration));
}

static uint8_t
intel_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
				 int lane)
{
	int	    i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
	int	    s = ((lane & 1) ?
			 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
			 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
	uint8_t l = intel_dp_link_status(link_status, i);

	return ((l >> s) & 3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
}

static uint8_t
intel_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
				      int lane)
{
	int	    i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
	int	    s = ((lane & 1) ?
			 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
			 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
	uint8_t l = intel_dp_link_status(link_status, i);

	return ((l >> s) & 3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
}


#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
 */
#define I830_DP_VOLTAGE_MAX	    DP_TRAIN_VOLTAGE_SWING_800

static uint8_t
intel_dp_pre_emphasis_max(uint8_t voltage_swing)
{
	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_output *intel_output,
		       uint8_t link_status[DP_LINK_STATUS_SIZE],
		       int lane_count,
		       uint8_t train_set[4])
{
	uint8_t v = 0;
	uint8_t p = 0;
	int lane;

	for (lane = 0; lane < lane_count; lane++) {
		uint8_t this_v = intel_get_adjust_request_voltage(link_status, lane);
		uint8_t this_p = intel_get_adjust_request_pre_emphasis(link_status, lane);

		if (this_v > v)
			v = this_v;
		if (this_p > p)
			p = this_p;
	}

	if (v >= I830_DP_VOLTAGE_MAX)
		v = I830_DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;

	if (p >= intel_dp_pre_emphasis_max(v))
		p = intel_dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;

	for (lane = 0; lane < 4; lane++)
		train_set[lane] = v | p;
}

static uint32_t
intel_dp_signal_levels(uint8_t train_set, int lane_count)
{
	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;
}

static uint8_t
intel_get_lane_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
		      int lane)
{
	int i = DP_LANE0_1_STATUS + (lane >> 1);
	int s = (lane & 1) * 4;
	uint8_t l = intel_dp_link_status(link_status, i);

	return (l >> s) & 0xf;
}

/* Check for clock recovery is done on all channels */
static bool
intel_clock_recovery_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
{
	int lane;
	uint8_t lane_status;

	for (lane = 0; lane < lane_count; lane++) {
		lane_status = intel_get_lane_status(link_status, lane);
		if ((lane_status & DP_LANE_CR_DONE) == 0)
			return false;
	}
	return true;
}

/* Check to see if channel eq is done on all channels */
#define CHANNEL_EQ_BITS (DP_LANE_CR_DONE|\
			 DP_LANE_CHANNEL_EQ_DONE|\
			 DP_LANE_SYMBOL_LOCKED)
static bool
intel_channel_eq_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
{
	uint8_t lane_align;
	uint8_t lane_status;
	int lane;

	lane_align = intel_dp_link_status(link_status,
					  DP_LANE_ALIGN_STATUS_UPDATED);
	if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
		return false;
	for (lane = 0; lane < lane_count; lane++) {
		lane_status = intel_get_lane_status(link_status, lane);
		if ((lane_status & CHANNEL_EQ_BITS) != CHANNEL_EQ_BITS)
			return false;
	}
	return true;
}

static bool
intel_dp_set_link_train(struct intel_output *intel_output,
			uint32_t dp_reg_value,
			uint8_t dp_train_pat,
			uint8_t train_set[4],
			bool first)
{
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	int ret;

	I915_WRITE(dp_priv->output_reg, dp_reg_value);
	POSTING_READ(dp_priv->output_reg);
	if (first)
		intel_wait_for_vblank(dev);

	intel_dp_aux_native_write_1(intel_output,
				    DP_TRAINING_PATTERN_SET,
				    dp_train_pat);

	ret = intel_dp_aux_native_write(intel_output,
					DP_TRAINING_LANE0_SET, train_set, 4);
	if (ret != 4)
		return false;

	return true;
}

static void
intel_dp_link_train(struct intel_output *intel_output, uint32_t DP,
		    uint8_t link_configuration[DP_LINK_CONFIGURATION_SIZE])
{
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	uint8_t	train_set[4];
	uint8_t link_status[DP_LINK_STATUS_SIZE];
	int i;
	uint8_t voltage;
	bool clock_recovery = false;
	bool channel_eq = false;
	bool first = true;
	int tries;

	/* Write the link configuration data */
	intel_dp_aux_native_write(intel_output, 0x100,
				  link_configuration, DP_LINK_CONFIGURATION_SIZE);

	DP |= DP_PORT_EN;
	DP &= ~DP_LINK_TRAIN_MASK;
	memset(train_set, 0, 4);
	voltage = 0xff;
	tries = 0;
	clock_recovery = false;
	for (;;) {
		/* Use train_set[0] to set the voltage and pre emphasis values */
		uint32_t    signal_levels = intel_dp_signal_levels(train_set[0], dp_priv->lane_count);
		DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;

		if (!intel_dp_set_link_train(intel_output, DP | DP_LINK_TRAIN_PAT_1,
					     DP_TRAINING_PATTERN_1, train_set, first))
			break;
		first = false;
		/* Set training pattern 1 */

		udelay(100);
		if (!intel_dp_get_link_status(intel_output, link_status))
			break;

		if (intel_clock_recovery_ok(link_status, dp_priv->lane_count)) {
			clock_recovery = true;
			break;
		}

		/* Check to see if we've tried the max voltage */
		for (i = 0; i < dp_priv->lane_count; i++)
			if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
				break;
		if (i == dp_priv->lane_count)
			break;

		/* Check to see if we've tried the same voltage 5 times */
		if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
			++tries;
			if (tries == 5)
				break;
		} else
			tries = 0;
		voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;

		/* Compute new train_set as requested by target */
		intel_get_adjust_train(intel_output, link_status, dp_priv->lane_count, train_set);
	}

	/* channel equalization */
	tries = 0;
	channel_eq = false;
	for (;;) {
		/* Use train_set[0] to set the voltage and pre emphasis values */
		uint32_t    signal_levels = intel_dp_signal_levels(train_set[0], dp_priv->lane_count);
		DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;

		/* channel eq pattern */
		if (!intel_dp_set_link_train(intel_output, DP | DP_LINK_TRAIN_PAT_2,
					     DP_TRAINING_PATTERN_2, train_set,
					     false))
			break;

		udelay(400);
		if (!intel_dp_get_link_status(intel_output, link_status))
			break;

		if (intel_channel_eq_ok(link_status, dp_priv->lane_count)) {
			channel_eq = true;
			break;
		}

		/* Try 5 times */
		if (tries > 5)
			break;

		/* Compute new train_set as requested by target */
		intel_get_adjust_train(intel_output, link_status, dp_priv->lane_count, train_set);
		++tries;
	}

	I915_WRITE(dp_priv->output_reg, DP | DP_LINK_TRAIN_OFF);
	POSTING_READ(dp_priv->output_reg);
	intel_dp_aux_native_write_1(intel_output,
				    DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_DISABLE);
}

static void
intel_dp_link_down(struct intel_output *intel_output, uint32_t DP)
{
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;

1014
	DRM_DEBUG_KMS("\n");
1015 1016 1017 1018 1019 1020 1021 1022

	if (IS_eDP(intel_output)) {
		DP &= ~DP_PLL_ENABLE;
		I915_WRITE(dp_priv->output_reg, DP);
		POSTING_READ(dp_priv->output_reg);
		udelay(100);
	}

1023 1024 1025 1026 1027 1028
	DP &= ~DP_LINK_TRAIN_MASK;
	I915_WRITE(dp_priv->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
	POSTING_READ(dp_priv->output_reg);

	udelay(17000);

1029 1030
	if (IS_eDP(intel_output))
		DP |= DP_LINK_TRAIN_OFF;
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	I915_WRITE(dp_priv->output_reg, DP & ~DP_PORT_EN);
	POSTING_READ(dp_priv->output_reg);
}

static void
intel_dp_restore(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;

	if (dp_priv->save_DP & DP_PORT_EN)
		intel_dp_link_train(intel_output, dp_priv->save_DP, dp_priv->save_link_configuration);
	else
		intel_dp_link_down(intel_output,  dp_priv->save_DP);
}

/*
 * 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
 */

static void
intel_dp_check_link_status(struct intel_output *intel_output)
{
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	uint8_t link_status[DP_LINK_STATUS_SIZE];

	if (!intel_output->enc.crtc)
		return;

	if (!intel_dp_get_link_status(intel_output, link_status)) {
		intel_dp_link_down(intel_output, dp_priv->DP);
		return;
	}

	if (!intel_channel_eq_ok(link_status, dp_priv->lane_count))
		intel_dp_link_train(intel_output, dp_priv->DP, dp_priv->link_configuration);
}

1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
static enum drm_connector_status
igdng_dp_detect(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	enum drm_connector_status status;

	status = connector_status_disconnected;
	if (intel_dp_aux_native_read(intel_output,
				     0x000, dp_priv->dpcd,
				     sizeof (dp_priv->dpcd)) == sizeof (dp_priv->dpcd))
	{
		if (dp_priv->dpcd[0] != 0)
			status = connector_status_connected;
	}
	return status;
}

1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
/**
 * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
 *
 * \return true if DP port is connected.
 * \return false if DP port is disconnected.
 */
static enum drm_connector_status
intel_dp_detect(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;
	uint32_t temp, bit;
	enum drm_connector_status status;

	dp_priv->has_audio = false;

1110 1111 1112
	if (IS_IGDNG(dev))
		return igdng_dp_detect(connector);

1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
	temp = I915_READ(PORT_HOTPLUG_EN);

	I915_WRITE(PORT_HOTPLUG_EN,
	       temp |
	       DPB_HOTPLUG_INT_EN |
	       DPC_HOTPLUG_INT_EN |
	       DPD_HOTPLUG_INT_EN);

	POSTING_READ(PORT_HOTPLUG_EN);

	switch (dp_priv->output_reg) {
	case DP_B:
		bit = DPB_HOTPLUG_INT_STATUS;
		break;
	case DP_C:
		bit = DPC_HOTPLUG_INT_STATUS;
		break;
	case DP_D:
		bit = DPD_HOTPLUG_INT_STATUS;
		break;
	default:
		return connector_status_unknown;
	}

	temp = I915_READ(PORT_HOTPLUG_STAT);

	if ((temp & bit) == 0)
		return connector_status_disconnected;

	status = connector_status_disconnected;
	if (intel_dp_aux_native_read(intel_output,
				     0x000, dp_priv->dpcd,
				     sizeof (dp_priv->dpcd)) == sizeof (dp_priv->dpcd))
	{
		if (dp_priv->dpcd[0] != 0)
			status = connector_status_connected;
	}
	return status;
}

static int intel_dp_get_modes(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
1156 1157 1158
	struct drm_device *dev = intel_output->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;
1159 1160 1161 1162

	/* We should parse the EDID data and find out if it has an audio sink
	 */

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
	ret = intel_ddc_get_modes(intel_output);
	if (ret)
		return ret;

	/* if eDP has no EDID, try to use fixed panel mode from VBT */
	if (IS_eDP(intel_output)) {
		if (dev_priv->panel_fixed_mode != NULL) {
			struct drm_display_mode *mode;
			mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
			drm_mode_probed_add(connector, mode);
			return 1;
		}
	}
	return 0;
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}

static void
intel_dp_destroy (struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);

	if (intel_output->i2c_bus)
		intel_i2c_destroy(intel_output->i2c_bus);
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	kfree(intel_output);
}

static const struct drm_encoder_helper_funcs intel_dp_helper_funcs = {
	.dpms = intel_dp_dpms,
	.mode_fixup = intel_dp_mode_fixup,
	.prepare = intel_encoder_prepare,
	.mode_set = intel_dp_mode_set,
	.commit = intel_encoder_commit,
};

static const struct drm_connector_funcs intel_dp_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.save = intel_dp_save,
	.restore = intel_dp_restore,
	.detect = intel_dp_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.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 void intel_dp_enc_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs intel_dp_enc_funcs = {
	.destroy = intel_dp_enc_destroy,
};

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void
intel_dp_hot_plug(struct intel_output *intel_output)
{
	struct intel_dp_priv *dp_priv = intel_output->dev_priv;

	if (dp_priv->dpms_mode == DRM_MODE_DPMS_ON)
		intel_dp_check_link_status(intel_output);
}

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void
intel_dp_init(struct drm_device *dev, int output_reg)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_connector *connector;
	struct intel_output *intel_output;
	struct intel_dp_priv *dp_priv;
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	const char *name = NULL;
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	intel_output = kcalloc(sizeof(struct intel_output) + 
			       sizeof(struct intel_dp_priv), 1, GFP_KERNEL);
	if (!intel_output)
		return;

	dp_priv = (struct intel_dp_priv *)(intel_output + 1);

	connector = &intel_output->base;
	drm_connector_init(dev, connector, &intel_dp_connector_funcs,
			   DRM_MODE_CONNECTOR_DisplayPort);
	drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);

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	if (output_reg == DP_A)
		intel_output->type = INTEL_OUTPUT_EDP;
	else
		intel_output->type = INTEL_OUTPUT_DISPLAYPORT;
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	if (output_reg == DP_B)
		intel_output->clone_mask = (1 << INTEL_DP_B_CLONE_BIT);
	else if (output_reg == DP_C)
		intel_output->clone_mask = (1 << INTEL_DP_C_CLONE_BIT);
	else if (output_reg == DP_D)
		intel_output->clone_mask = (1 << INTEL_DP_D_CLONE_BIT);

	if (IS_eDP(intel_output)) {
		intel_output->crtc_mask = (1 << 1);
Z
Zhenyu Wang 已提交
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		intel_output->clone_mask = (1 << INTEL_EDP_CLONE_BIT);
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	} else
		intel_output->crtc_mask = (1 << 0) | (1 << 1);
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	connector->interlace_allowed = true;
	connector->doublescan_allowed = 0;

	dp_priv->intel_output = intel_output;
	dp_priv->output_reg = output_reg;
	dp_priv->has_audio = false;
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	dp_priv->dpms_mode = DRM_MODE_DPMS_ON;
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	intel_output->dev_priv = dp_priv;

	drm_encoder_init(dev, &intel_output->enc, &intel_dp_enc_funcs,
			 DRM_MODE_ENCODER_TMDS);
	drm_encoder_helper_add(&intel_output->enc, &intel_dp_helper_funcs);

	drm_mode_connector_attach_encoder(&intel_output->base,
					  &intel_output->enc);
	drm_sysfs_connector_add(connector);

	/* Set up the DDC bus. */
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	switch (output_reg) {
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		case DP_A:
			name = "DPDDC-A";
			break;
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		case DP_B:
		case PCH_DP_B:
			name = "DPDDC-B";
			break;
		case DP_C:
		case PCH_DP_C:
			name = "DPDDC-C";
			break;
		case DP_D:
		case PCH_DP_D:
			name = "DPDDC-D";
			break;
	}

	intel_dp_i2c_init(intel_output, name);
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	intel_output->ddc_bus = &dp_priv->adapter;
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	intel_output->hot_plug = intel_dp_hot_plug;
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	if (output_reg == DP_A) {
		/* initialize panel mode from VBT if available for eDP */
		if (dev_priv->lfp_lvds_vbt_mode) {
			dev_priv->panel_fixed_mode =
				drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
			if (dev_priv->panel_fixed_mode) {
				dev_priv->panel_fixed_mode->type |=
					DRM_MODE_TYPE_PREFERRED;
			}
		}
	}

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	/* 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);
	}
}