From: Dave Airlie airlied@redhat.com
DisplayPort spec v1.1a, Table 2-52.
Same commit to Intel by ajax in 9962c9252e46eda7058067cbe73bdf1ed74b0d37
Signed-off-by: Dave Airlie airlied@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);