[Intel-gfx] [PATCH v3 1/6] drm/i915: Fix DP link training pattern mask

[Imre Deak]

An LTTPR can be trained with training pattern 4 even if the DPCD
revision is < 1.4, but drm_dp_training_pattern_mask() would change
pattern 4 to pattern 3 on those DPCD revisions.

Since intel_dp_training_pattern() makes already sure that the proper
training pattern is used, all that needs to be masked out is the
scrambling disable flag, which is or'd to the mask later based on the
training pattern.

v2:
- Use a helper instead of open-coding the masking. (Ville)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c              |  3 +--
 drivers/gpu/drm/i915/display/intel_dp.c               | 10 +++++-----
 drivers/gpu/drm/i915/display/intel_dp_link_training.c |  2 +-
 drivers/gpu/drm/i915/display/intel_dp_link_training.h |  6 ++++++
 4 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 6f7bd67732f2..d21b2ccea182 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4259,13 +4259,12 @@ static void intel_ddi_set_link_train(struct intel_dp *intel_dp,
 {
 	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
-	u8 train_pat_mask = drm_dp_training_pattern_mask(intel_dp->dpcd);
 	u32 temp;
 
 	temp = intel_de_read(dev_priv, dp_tp_ctl_reg(encoder, crtc_state));
 
 	temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
-	switch (dp_train_pat & train_pat_mask) {
+	switch (intel_dp_training_pattern_symbol(dp_train_pat)) {
 	case DP_TRAINING_PATTERN_DISABLE:
 		temp |= DP_TP_CTL_LINK_TRAIN_NORMAL;
 		break;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 239016dcd544..8124c3d551f5 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3856,7 +3856,7 @@ cpt_set_link_train(struct intel_dp *intel_dp,
 
 	*DP &= ~DP_LINK_TRAIN_MASK_CPT;
 
-	switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
+	switch (intel_dp_training_pattern_symbol(dp_train_pat)) {
 	case DP_TRAINING_PATTERN_DISABLE:
 		*DP |= DP_LINK_TRAIN_OFF_CPT;
 		break;
@@ -3887,7 +3887,7 @@ g4x_set_link_train(struct intel_dp *intel_dp,
 
 	*DP &= ~DP_LINK_TRAIN_MASK;
 
-	switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
+	switch (intel_dp_training_pattern_symbol(dp_train_pat)) {
 	case DP_TRAINING_PATTERN_DISABLE:
 		*DP |= DP_LINK_TRAIN_OFF;
 		break;
@@ -4589,12 +4589,12 @@ intel_dp_program_link_training_pattern(struct intel_dp *intel_dp,
 				       u8 dp_train_pat)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	u8 train_pat_mask = drm_dp_training_pattern_mask(intel_dp->dpcd);
 
-	if (dp_train_pat & train_pat_mask)
+	if ((intel_dp_training_pattern_symbol(dp_train_pat)) !=
+	    DP_TRAINING_PATTERN_DISABLE)
 		drm_dbg_kms(&dev_priv->drm,
 			    "Using DP training pattern TPS%d\n",
-			    dp_train_pat & train_pat_mask);
+			    intel_dp_training_pattern_symbol(dp_train_pat));
 
 	intel_dp->set_link_train(intel_dp, crtc_state, dp_train_pat);
 }
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 51e8d46d9b7f..b2ff88a152cd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -100,7 +100,7 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
 					       dp_train_pat);
 
 	buf[0] = dp_train_pat;
-	if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) ==
+	if (intel_dp_training_pattern_symbol(dp_train_pat) ==
 	    DP_TRAINING_PATTERN_DISABLE) {
 		/* don't write DP_TRAINING_LANEx_SET on disable */
 		len = 1;
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.h b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
index 648a6d1f9fa2..bf9474e41aed 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
@@ -19,4 +19,10 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
 void intel_dp_stop_link_train(struct intel_dp *intel_dp,
 			      const struct intel_crtc_state *crtc_state);
 
+/* Get the TPSx symbol type of the value programmed to DP_TRAINING_PATTERN_SET */
+static inline u8 intel_dp_training_pattern_symbol(u8 pattern)
+{
+	return pattern & ~DP_LINK_SCRAMBLING_DISABLE;
+}
+
 #endif /* __INTEL_DP_LINK_TRAINING_H__ */
-- 
2.25.1