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drm/radeon: dp only enable enhanced framing if sink supports. 

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

Same commit to Intel by ajax in 9962c9252e

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2012-03-18 10:10:50 +00:00
parent 3c12513d2f
commit abc8113fe5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/radeon/atombios_dp.c
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@ -746,7 +746,8 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
/* set the lane count on the sink */
tmp = dp_info->dp_lane_count;
if (dp_info->dpcd[0] >= 0x11)
if (dp_info->dpcd[DP_DPCD_REV] >= 0x11 &&
dp_info->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)
tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);