From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Latest version of the "CHV DPIO programming notes" no longer requires writes
to TX DW 11 to fix a +2UI interpair skew issue. The current code from
April 2014 was actually causing additional skew issues between all
TMDS pairs.
ver2: added same treatment to intel_dp.c based on Ville's testing.
Cc: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 5 -----
drivers/gpu/drm/i915/intel_hdmi.c | 5 -----
2 files changed, 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1b87969..f106763 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2740,11 +2740,6 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
/* Program Tx lane latency optimal setting*/
for (i = 0; i < 4; i++) {
- /* Set the latency optimal bit */
- data = (i == 1) ? 0x0 : 0x6;
- vlv_dpio_write(dev_priv, pipe, CHV_TX_DW11(ch, i),
- data << DPIO_FRC_LATENCY_SHFIT);
-
/* Set the upar bit */
data = (i == 1) ? 0x0 : 0x1;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i),
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 26222e6..3cef326 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1515,11 +1515,6 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
/* Program Tx latency optimal setting */
for (i = 0; i < 4; i++) {
- /* Set the latency optimal bit */
- data = (i == 1) ? 0x0 : 0x6;
- vlv_dpio_write(dev_priv, pipe, CHV_TX_DW11(ch, i),
- data << DPIO_FRC_LATENCY_SHFIT);
-
/* Set the upar bit */
data = (i == 1) ? 0x0 : 0x1;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i),
--
1.7.9.5
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