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drm/i915/dp: Only enable enhanced framing if the sink supports it 

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

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Adam Jackson 2010-05-13 14:45:42 -04:00 committed by Eric Anholt
parent 9908ff736a
commit 9962c9252e
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/i915/intel_dp.c
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@ -675,10 +675,9 @@ 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;
}