From: Fangzhi Zuo <jerry.zuo@xxxxxxx> commit 482e6ad9adde69d9da08864b4ccf4dfd53edb2f0 upstream. 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@xxxxxxx> Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx> Signed-off-by: Fangzhi Zuo <jerry.zuo@xxxxxxx> Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx [Adjusted for variables that were renamed between 6.1 and 6.3.] Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2763,7 +2763,7 @@ 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_port) continue; mutex_lock(&aconnector->hpd_lock); @@ -6492,7 +6492,7 @@ static int dm_encoder_helper_atomic_chec int clock, bpp = 0; bool is_y420 = false; - if (!aconnector->port || !aconnector->dc_sink) + if (!aconnector->port) return 0; mst_port = aconnector->port;
