mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/amd/display: Link training retry fix for abort case 

[Why]
If link training is aborted, it shall be retried if sink is present.

[How]
Check hpd status to find out whether sink is present or not. If sink is
present, then link training shall be tried again with same settings.
Otherwise, link training shall be aborted.

Reviewed-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Meenakshikumar Somasundaram 2021-08-30 14:01:10 -04:00 committed by Alex Deucher
parent 4e00a434a0
commit 71ae30997a
1 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -1840,9 +1840,13 @@ bool perform_link_training_with_retries(
dp_disable_link_phy(link, signal);
/* Abort link training if failure due to sink being unplugged. */
if (status == LINK_TRAINING_ABORT)
break;
else if (do_fallback) {
if (status == LINK_TRAINING_ABORT) {
enum dc_connection_type type = dc_connection_none;
dc_link_detect_sink(link, &type);
if (type == dc_connection_none)
break;
} else if (do_fallback) {
decide_fallback_link_setting(*link_setting, &current_setting, status);
/* Fail link training if reduced link bandwidth no longer meets
* stream requirements.