[PATCH 2/2] Revert "drm/amd/display: Don't skip link training for empty dongle"

[Harry Wentland]

This reverts commit 80adaebd2d411b7d6872a097634848a71eb13d20.

[WHY]
This change was working around a regression that occured in this
patch:
0301ccbaf67d drm/amd/display: DP Compliance 400.1.1 failure

With the fix to run verify_link_cap when the SINK_COUNT of
dongles becomes non-zero this change is no longer needed.

Cc: Louis Li <Ching-shih.Li at amd.com>
Cc: Wenjing Liu <Wenjing.Liu at amd.com>
Cc: Hersen Wu <hersenxs.wu at amd.com>
Cc: Eric Yang <Eric.Yang2 at amd.com>
Signed-off-by: Harry Wentland <harry.wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index cc2e05003595..a09119c10d7c 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -851,18 +851,12 @@ static bool dc_link_detect_helper(struct dc_link *link,
 				if (memcmp(&link->dpcd_caps, &prev_dpcd_caps, sizeof(struct dpcd_caps)))
 					same_dpcd = false;
 			}
-			/* Active dongle plug in without display or downstream unplug*/
+			/* Active dongle downstream unplug*/
 			if (link->type == dc_connection_active_dongle &&
 				link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
-				if (prev_sink != NULL) {
+				if (prev_sink != NULL)
 					/* Downstream unplug */
 					dc_sink_release(prev_sink);
-				} else {
-					/* Empty dongle plug in */
-					dp_verify_link_cap_with_retries(link,
-							&link->reported_link_cap,
-							LINK_TRAINING_MAX_VERIFY_RETRY);
-				}
 				return true;
 			}
 
-- 
2.25.0