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drm/amd/display: Check aux channel before MST resume 

It is to fix: MST display failed to resume from S3

At the beginning of resume from S3, need to check if mgr->aux is
NULL. Fake MST encoder doesn't have real aux channel.

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jerry (Fangzhi) Zuo 2017-11-03 16:04:34 -04:00 committed by Alex Deucher
parent 116b2632ab
commit 30ec2b9717
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -520,7 +520,8 @@ static int detect_mst_link_for_all_connectors(struct drm_device *dev)
list_for_each_entry(connector, &dev->mode_config.connector_list, head) { list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
aconnector = to_amdgpu_dm_connector(connector); aconnector = to_amdgpu_dm_connector(connector);
if (aconnector->dc_link->type == dc_connection_mst_branch) { if (aconnector->dc_link->type == dc_connection_mst_branch &&
aconnector->mst_mgr.aux) {
DRM_DEBUG_DRIVER("DM_MST: starting TM on aconnector: %p [id: %d]\n", DRM_DEBUG_DRIVER("DM_MST: starting TM on aconnector: %p [id: %d]\n",
aconnector, aconnector->base.base.id); aconnector, aconnector->base.base.id);