[Intel-gfx] [PATCH] drm/i915: Disable TRAINING_PATTERN_SET before stopping the TPS transmission

[Ville Syrjala]

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

DP spec says:
"The Source device shall start sending the idle pattern after
 it has cleared the Training_Pattern byte in the DPCD."

Currently we do these in operations in the opposite order.
Swap them around to match the spec.

Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_link_training.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index d8c6d7054d11..2d3396bfc207 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -697,9 +697,9 @@ static bool intel_dp_disable_dpcd_training_pattern(struct intel_dp *intel_dp,
  * @intel_dp: DP struct
  * @crtc_state: state for CRTC attached to the encoder
  *
- * Stop the link training of the @intel_dp port, disabling the test pattern
- * symbol generation on the port and disabling the training pattern in
- * the sink's DPCD.
+ * Stop the link training of the @intel_dp port, disabling the training
+ * pattern in the sink's DPCD, and disabling the test pattern symbol
+ * generation on the port.
  *
  * What symbols are output on the port after this point is
  * platform specific: On DDI/VLV/CHV platforms it will be the idle pattern
@@ -713,10 +713,9 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp,
 {
 	intel_dp->link_trained = true;
 
-	intel_dp_program_link_training_pattern(intel_dp,
-					       crtc_state,
-					       DP_TRAINING_PATTERN_DISABLE);
 	intel_dp_disable_dpcd_training_pattern(intel_dp, DP_PHY_DPRX);
+	intel_dp_program_link_training_pattern(intel_dp, crtc_state,
+					       DP_TRAINING_PATTERN_DISABLE);
 }
 
 static bool
-- 
2.26.2