[Intel-gfx] [PATCH 03/12] drm/i915: Avoid mixing up SST and MST in DDI setup

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The MST vs. SST selection should depend purely on the choice of the
connector/encoder. So don't try to determine the correct DDI mode
based on the intel_dp->is_mst, which simply tells us whether the sink
is in MST mode or not. Instead derive the information from the encoder
type. Since the link training code deals in non-fake encoders, we'll
also need to keep a second copy of that information around, which we'll
now designate as 'link_mst'.

Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 21 +++------------------
 drivers/gpu/drm/i915/intel_dp.c  |  1 +
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 3 files changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index dd1d6fe12297..3b3a0a808477 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1111,7 +1111,6 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
-	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	enum pipe pipe = intel_crtc->pipe;
@@ -1177,29 +1176,15 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
 			temp |= TRANS_DDI_MODE_SELECT_HDMI;
 		else
 			temp |= TRANS_DDI_MODE_SELECT_DVI;
-
 	} else if (type == INTEL_OUTPUT_ANALOG) {
 		temp |= TRANS_DDI_MODE_SELECT_FDI;
 		temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
-
 	} else if (type == INTEL_OUTPUT_DP ||
 		   type == INTEL_OUTPUT_EDP) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
-
-		if (intel_dp->is_mst) {
-			temp |= TRANS_DDI_MODE_SELECT_DP_MST;
-		} else
-			temp |= TRANS_DDI_MODE_SELECT_DP_SST;
-
+		temp |= TRANS_DDI_MODE_SELECT_DP_SST;
 		temp |= DDI_PORT_WIDTH(intel_crtc->config->lane_count);
 	} else if (type == INTEL_OUTPUT_DP_MST) {
-		struct intel_dp *intel_dp = &enc_to_mst(encoder)->primary->dp;
-
-		if (intel_dp->is_mst) {
-			temp |= TRANS_DDI_MODE_SELECT_DP_MST;
-		} else
-			temp |= TRANS_DDI_MODE_SELECT_DP_SST;
-
+		temp |= TRANS_DDI_MODE_SELECT_DP_MST;
 		temp |= DDI_PORT_WIDTH(intel_crtc->config->lane_count);
 	} else {
 		WARN(1, "Invalid encoder type %d for pipe %c\n",
@@ -2105,7 +2090,7 @@ void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp)
 
 	val = DP_TP_CTL_ENABLE |
 	      DP_TP_CTL_LINK_TRAIN_PAT1 | DP_TP_CTL_SCRAMBLE_DISABLE;
-	if (intel_dp->is_mst)
+	if (intel_dp->link_mst)
 		val |= DP_TP_CTL_MODE_MST;
 	else {
 		val |= DP_TP_CTL_MODE_SST;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8c38e3483989..0096c651c21f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1651,6 +1651,7 @@ void intel_dp_set_link_params(struct intel_dp *intel_dp,
 {
 	intel_dp->link_rate = pipe_config->port_clock;
 	intel_dp->lane_count = pipe_config->lane_count;
+	intel_dp->link_mst = intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST);
 }
 
 static void intel_dp_prepare(struct intel_encoder *encoder)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e74d851868c5..70d7f33d6747 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -852,6 +852,7 @@ struct intel_dp {
 	int link_rate;
 	uint8_t lane_count;
 	uint8_t sink_count;
+	bool link_mst;
 	bool has_audio;
 	bool detect_done;
 	enum hdmi_force_audio force_audio;
-- 
2.7.4