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drm/amd/display: Have Payload Properly Created After Resume 

At drm suspend sequence, MST dc_sink is removed. When commit cached
MST stream back in drm resume sequence, the MST stream payload is not
properly created and added into the payload table. After resume, topology
change is reprobed by removing existing streams first. That leads to
no payload is found in the existing payload table as below error
"[drm] ERROR No payload for [MST PORT:] found in mst state"

1. In encoder .atomic_check routine, remove check existance of dc_sink
2. Bypass MST by checking existence of MST root port. dc_link_type cannot
differentiate MST port before topology is rediscovered.

Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Fangzhi Zuo 2023-05-10 16:43:30 -04:00 committed by Alex Deucher
parent 0ab720d506
commit 91b38ca1b3
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -2853,7 +2853,7 @@ static int dm_resume(void *handle)
* this is the case when traversing through already created
* MST connectors, should be skipped
*/
if (aconnector->dc_link->type == dc_connection_mst_branch)
if (aconnector && aconnector->mst_root)
continue;
mutex_lock(&aconnector->hpd_lock);
@ -6776,7 +6776,7 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
int clock, bpp = 0;
bool is_y420 = false;
if (!aconnector->mst_output_port || !aconnector->dc_sink)
if (!aconnector->mst_output_port)
return 0;
mst_port = aconnector->mst_output_port;