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Commit 901c2daf authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
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drm/i915: Put back lane_count into intel_dp and add link_rate too 



With MST there won't be a crtc assigned to the main link encoder, so
trying to dig up the pipe_config from there is a recipe for an oops.

Instead store the parameters (lane_count and link_rate) in the encoder,
and use those values during link training etc. Since those parameters
are now assigned only when the link is actually enabled,
.compute_config() won't clobber them as it did before.

Hardware state readout is still bonkers though as we don't transfer the
link parameters from pipe_config intel_dp. We should do that during
encoder sanitation. But since we don't even do a proper job of reading
out the main link encoder state for MST there's littel point in
worrying about this now.

Fixes a regression with MST caused by:
 commit 90a6b7b0
 Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
 Date:   Mon Jul 6 16:39:15 2015 +0300

    drm/i915: Move intel_dp->lane_count into pipe_config

v2: Different apporoach that should keep intel_dp_check_mst_status()
    somewhat less oopsy

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reported-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent e5756c10

drivers/gpu/drm/i915/intel_ddi.c

+3 −2
Original line number Diff line number Diff line
@@ -728,11 +728,10 @@ void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder) 
	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);

	struct intel_digital_port *intel_dig_port =

		enc_to_dig_port(&encoder->base);

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



	intel_dp->DP = intel_dig_port->saved_port_bits |

		DDI_BUF_CTL_ENABLE | DDI_BUF_TRANS_SELECT(0);

	intel_dp->DP |= DDI_PORT_WIDTH(crtc->config->lane_count);

	intel_dp->DP |= DDI_PORT_WIDTH(intel_dp->lane_count);

}



static struct intel_encoder *
@@ -2314,6 +2313,8 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder) 
	if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {

		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);



		intel_dp_set_link_params(intel_dp, crtc->config);



		intel_ddi_init_dp_buf_reg(intel_encoder);



		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);

drivers/gpu/drm/i915/intel_dp.c

+24 −29
Original line number Diff line number Diff line
@@ -1584,6 +1584,13 @@ static void ironlake_set_pll_cpu_edp(struct intel_dp *intel_dp) 
	udelay(500);

}



void intel_dp_set_link_params(struct intel_dp *intel_dp,

			      const struct intel_crtc_state *pipe_config)

{

	intel_dp->link_rate = pipe_config->port_clock;

	intel_dp->lane_count = pipe_config->lane_count;

}



static void intel_dp_prepare(struct intel_encoder *encoder)

{

	struct drm_device *dev = encoder->base.dev;
@@ -1593,6 +1600,8 @@ static void intel_dp_prepare(struct intel_encoder *encoder) 
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);

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



	intel_dp_set_link_params(intel_dp, crtc->config);



	/*

	 * There are four kinds of DP registers:

	 *
@@ -3348,15 +3357,13 @@ static void 
intel_get_adjust_train(struct intel_dp *intel_dp,

		       const uint8_t link_status[DP_LINK_STATUS_SIZE])

{

	struct intel_crtc *crtc =

		to_intel_crtc(dp_to_dig_port(intel_dp)->base.base.crtc);

	uint8_t v = 0;

	uint8_t p = 0;

	int lane;

	uint8_t voltage_max;

	uint8_t preemph_max;



	for (lane = 0; lane < crtc->config->lane_count; lane++) {

	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);
@@ -3527,8 +3534,6 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, 
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);

	struct drm_i915_private *dev_priv =

		to_i915(intel_dig_port->base.base.dev);

	struct intel_crtc *crtc =

		to_intel_crtc(intel_dig_port->base.base.crtc);

	uint8_t buf[sizeof(intel_dp->train_set) + 1];

	int ret, len;
@@ -3544,8 +3549,8 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, 
		len = 1;

	} else {

		/* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */

		memcpy(buf + 1, intel_dp->train_set, crtc->config->lane_count);

		len = crtc->config->lane_count + 1;

		memcpy(buf + 1, intel_dp->train_set, intel_dp->lane_count);

		len = intel_dp->lane_count + 1;

	}



	ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET,
@@ -3571,8 +3576,6 @@ intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, 
	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);

	struct drm_i915_private *dev_priv =

		to_i915(intel_dig_port->base.base.dev);

	struct intel_crtc *crtc =

		to_intel_crtc(intel_dig_port->base.base.crtc);

	int ret;



	intel_get_adjust_train(intel_dp, link_status);
@@ -3582,9 +3585,9 @@ intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, 
	POSTING_READ(intel_dp->output_reg);



	ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET,

				intel_dp->train_set, crtc->config->lane_count);

				intel_dp->train_set, intel_dp->lane_count);



	return ret == crtc->config->lane_count;

	return ret == intel_dp->lane_count;

}



static void intel_dp_set_idle_link_train(struct intel_dp *intel_dp)
@@ -3623,8 +3626,6 @@ void 
intel_dp_start_link_train(struct intel_dp *intel_dp)

{

	struct drm_encoder *encoder = &dp_to_dig_port(intel_dp)->base.base;

	struct intel_crtc *crtc =

		to_intel_crtc(dp_to_dig_port(intel_dp)->base.base.crtc);

	struct drm_device *dev = encoder->dev;

	int i;

	uint8_t voltage;
@@ -3636,12 +3637,12 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) 
	if (HAS_DDI(dev))

		intel_ddi_prepare_link_retrain(encoder);



	intel_dp_compute_rate(intel_dp, crtc->config->port_clock,

	intel_dp_compute_rate(intel_dp, intel_dp->link_rate,

			      &link_bw, &rate_select);



	/* Write the link configuration data */

	link_config[0] = link_bw;

	link_config[1] = crtc->config->lane_count;

	link_config[1] = intel_dp->lane_count;

	if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))

		link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;

	drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_BW_SET, link_config, 2);
@@ -3675,7 +3676,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) 
			break;

		}



		if (drm_dp_clock_recovery_ok(link_status, crtc->config->lane_count)) {

		if (drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) {

			DRM_DEBUG_KMS("clock recovery OK\n");

			break;

		}
@@ -3698,10 +3699,10 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) 
		}



		/* Check to see if we've tried the max voltage */

		for (i = 0; i < crtc->config->lane_count; i++)

		for (i = 0; i < intel_dp->lane_count; i++)

			if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)

				break;

		if (i == crtc->config->lane_count) {

		if (i == intel_dp->lane_count) {

			++loop_tries;

			if (loop_tries == 5) {

				DRM_ERROR("too many full retries, give up\n");
@@ -3738,15 +3739,13 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) 
void

intel_dp_complete_link_train(struct intel_dp *intel_dp)

{

	struct intel_crtc *crtc =

		to_intel_crtc(dp_to_dig_port(intel_dp)->base.base.crtc);

	bool channel_eq = false;

	int tries, cr_tries;

	uint32_t DP = intel_dp->DP;

	uint32_t training_pattern = DP_TRAINING_PATTERN_2;



	/* Training Pattern 3 for HBR2 or 1.2 devices that support it*/

	if (crtc->config->port_clock == 540000 || intel_dp->use_tps3)

	if (intel_dp->link_rate == 540000 || intel_dp->use_tps3)

		training_pattern = DP_TRAINING_PATTERN_3;



	/* channel equalization */
@@ -3776,7 +3775,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp) 


		/* Make sure clock is still ok */

		if (!drm_dp_clock_recovery_ok(link_status,

					      crtc->config->lane_count)) {

					      intel_dp->lane_count)) {

			intel_dp->train_set_valid = false;

			intel_dp_start_link_train(intel_dp);

			intel_dp_set_link_train(intel_dp, &DP,
@@ -3787,7 +3786,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp) 
		}



		if (drm_dp_channel_eq_ok(link_status,

					 crtc->config->lane_count)) {

					 intel_dp->lane_count)) {

			channel_eq = true;

			break;

		}
@@ -4285,8 +4284,6 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp) 
static int

intel_dp_check_mst_status(struct intel_dp *intel_dp)

{

	struct intel_crtc *crtc =

		to_intel_crtc(dp_to_dig_port(intel_dp)->base.base.crtc);

	bool bret;



	if (intel_dp->is_mst) {
@@ -4300,7 +4297,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp) 


			/* check link status - esi[10] = 0x200c */

			if (intel_dp->active_mst_links &&

			    !drm_dp_channel_eq_ok(&esi[10], crtc->config->lane_count)) {

			    !drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) {

				DRM_DEBUG_KMS("channel EQ not ok, retraining\n");

				intel_dp_start_link_train(intel_dp);

				intel_dp_complete_link_train(intel_dp);
@@ -4355,8 +4352,6 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) 
{

	struct drm_device *dev = intel_dp_to_dev(intel_dp);

	struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;

	struct intel_crtc *crtc =

		to_intel_crtc(dp_to_dig_port(intel_dp)->base.base.crtc);

	u8 sink_irq_vector;

	u8 link_status[DP_LINK_STATUS_SIZE];
@@ -4392,7 +4387,7 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) 
			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");

	}



	if (!drm_dp_channel_eq_ok(link_status, crtc->config->lane_count)) {

	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {

		DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",

			      intel_encoder->base.name);

		intel_dp_start_link_train(intel_dp);

drivers/gpu/drm/i915/intel_dp_mst.c

+2 −0
Original line number Diff line number Diff line
@@ -165,6 +165,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder) 
	if (intel_dp->active_mst_links == 0) {

		enum port port = intel_ddi_get_encoder_port(encoder);



		intel_dp_set_link_params(intel_dp, intel_crtc->config);



		/* FIXME: add support for SKL */

		if (INTEL_INFO(dev)->gen < 9)

			I915_WRITE(PORT_CLK_SEL(port),

drivers/gpu/drm/i915/intel_drv.h

+4 −0
Original line number Diff line number Diff line
@@ -708,6 +708,8 @@ struct intel_dp { 
	uint32_t output_reg;

	uint32_t aux_ch_ctl_reg;

	uint32_t DP;

	int link_rate;

	uint8_t lane_count;

	bool has_audio;

	enum hdmi_force_audio force_audio;

	bool limited_color_range;
@@ -1161,6 +1163,8 @@ void assert_csr_loaded(struct drm_i915_private *dev_priv); 
void intel_dp_init(struct drm_device *dev, int output_reg, enum port port);

bool intel_dp_init_connector(struct intel_digital_port *intel_dig_port,

			     struct intel_connector *intel_connector);

void intel_dp_set_link_params(struct intel_dp *intel_dp,

			      const struct intel_crtc_state *pipe_config);

void intel_dp_start_link_train(struct intel_dp *intel_dp);

void intel_dp_complete_link_train(struct intel_dp *intel_dp);

void intel_dp_stop_link_train(struct intel_dp *intel_dp);