[Intel-gfx] [PATCH 1/2] drm/i915: Set sync polarity correctly on DisplayPort

[Adam Jackson]

Probably only matters for format-converting dongles, but might as well
get it right all the time.

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 drivers/gpu/drm/i915/intel_dp.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 3ef3a0d..a21f810 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -632,9 +632,12 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 
 	dp_priv->DP = (DP_LINK_TRAIN_OFF |
 			DP_VOLTAGE_0_4 |
-			DP_PRE_EMPHASIS_0 |
-			DP_SYNC_VS_HIGH |
-			DP_SYNC_HS_HIGH);
+			DP_PRE_EMPHASIS_0);
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
+		dp_priv->DP |= DP_SYNC_HS_HIGH;
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
+		dp_priv->DP |= DP_SYNC_VS_HIGH;
 
 	switch (dp_priv->lane_count) {
 	case 1:
-- 
1.6.5.2