From c654f2394709f1a19daf82f922089f9cf8fc9db2 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Sun, 18 Mar 2012 10:10:50 +0000 Subject: [PATCH] drm/radeon: dp only enable enhanced framing if sink supports. DisplayPort spec v1.1a, Table 2-52. Same commit to Intel by ajax in bb8841bab53d36c418b1339793aeb48b07234cae Reviewed-by: Alex Deucher Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/atombios_dp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 552b436451fd4..191218ad92e79 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); -- 2.39.5