[Intel-gfx] [PATCH 1/2] drm/i915/dp: Only enable enhanced framing if the sink supports it

[Adam Jackson]

DisplayPort spec v1.1a, Table 2-52.

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 drivers/gpu/drm/i915/intel_dp.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 77e40cf..78a75e8 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -656,10 +656,9 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 	dp_priv->link_configuration[1] = dp_priv->lane_count;
 
 	/*
-	 * Check for DPCD version > 1.1,
-	 * enable enahanced frame stuff in that case
+	 * Check for DPCD version > 1.1 and enhanced framing support
 	 */
-	if (dp_priv->dpcd[0] >= 0x11) {
+	if (dp_priv->dpcd[0] >= 0x11 && (dp_priv->dpcd[2] & DP_ENHANCED_FRAME_CAP)) {
 		dp_priv->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 		dp_priv->DP |= DP_ENHANCED_FRAMING;
 	}
-- 
1.7.0.1