[Intel-gfx] [PATCH 05/12] drm/i915: Fix DP enhanced framing for CPT

[ville.syrjala at linux.intel.com]

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

Currently we're always enabling enhanced framing on CPT even if the sink
doesn't support it. Fix this up by actaully looking at what the sink
tells us.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 3 +--
 drivers/gpu/drm/i915/intel_dp.c      | 9 +++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a392188..a177f2e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4206,8 +4206,7 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
 		temp &= ~(TRANS_DP_PORT_SEL_MASK |
 			  TRANS_DP_SYNC_MASK |
 			  TRANS_DP_BPC_MASK);
-		temp |= (TRANS_DP_OUTPUT_ENABLE |
-			 TRANS_DP_ENH_FRAMING);
+		temp |= TRANS_DP_OUTPUT_ENABLE;
 		temp |= bpc << 9; /* same format but at 11:9 */
 
 		if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index dc89931..17b006c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1573,7 +1573,16 @@ static void intel_dp_prepare(struct intel_encoder *encoder)
 
 		intel_dp->DP |= crtc->pipe << 29;
 	} else if (HAS_PCH_CPT(dev) && port != PORT_A) {
+		u32 trans_dp;
+
 		intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
+
+		trans_dp = I915_READ(TRANS_DP_CTL(crtc->pipe));
+		if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
+			trans_dp |= TRANS_DP_ENH_FRAMING;
+		else
+			trans_dp &= ~TRANS_DP_ENH_FRAMING;
+		I915_WRITE(TRANS_DP_CTL(crtc->pipe), trans_dp);
 	} else {
 		if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev))
 			intel_dp->DP |= intel_dp->color_range;
-- 
2.0.5