[Intel-gfx] [PATCH 1/2] drm/i915/ddi: Don't frob the DP link scramble disabling flag

[Imre Deak]

According to BSpec this flag should not be changed while the DDI
function is enabled. On BDW+ the DP_TP_CTL register spec also states it
explicitly that the HW takes care of enabling/disabling the scrambling
for training patterns (and it must stay enabled for normal pixel
output). Assume that this HW automatic handling of scrambling is also
true for HSW.

BSpec: 8013, 7557, 50484

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 2c484b55bcdf..c467f18d5e1b 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4037,8 +4037,7 @@ static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp)
 			intel_wait_ddi_buf_idle(dev_priv, port);
 	}
 
-	dp_tp_ctl = DP_TP_CTL_ENABLE |
-		    DP_TP_CTL_LINK_TRAIN_PAT1 | DP_TP_CTL_SCRAMBLE_DISABLE;
+	dp_tp_ctl = DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_PAT1;
 	if (intel_dp->link_mst)
 		dp_tp_ctl |= DP_TP_CTL_MODE_MST;
 	else {
@@ -4066,11 +4065,6 @@ static void intel_ddi_set_link_train(struct intel_dp *intel_dp,
 
 	temp = intel_de_read(dev_priv, intel_dp->regs.dp_tp_ctl);
 
-	if (dp_train_pat & DP_LINK_SCRAMBLING_DISABLE)
-		temp |= DP_TP_CTL_SCRAMBLE_DISABLE;
-	else
-		temp &= ~DP_TP_CTL_SCRAMBLE_DISABLE;
-
 	temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
 	switch (dp_train_pat & train_pat_mask) {
 	case DP_TRAINING_PATTERN_DISABLE:
-- 
2.23.1