drm/i915/chv: Remove DPIO force latency causing interpair skew issue
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 Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8e0d101..60e8d5d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2742,11 +2742,6 @@
/* 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 cacbafd..bfabd5f 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1515,11 +1515,6 @@
/* 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),
