From: Dave Airlie <airl...@redhat.com>
DisplayPort spec v1.1a, Table 2-52.
Same commit to Intel by ajax in 9962c9252e46eda7058067cbe73bdf1ed74b0d37
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
drivers/gpu/drm/radeon/atombios_dp.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index 552b436..191218a 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -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);
--
1.7.7.6
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