drm/amd/display: Clear MST topology if it fails to resume

[Why]
In case of failure to resume MST topology after suspend, an emtpty
mst tree prevents further mst hub detection on the same connector.
That causes the issue with MST hub hotplug after it's been unplug in
suspend.

[How]
Stop topology manager on the connector after detecting DM_MST failure.

Reviewed-by: Wayne Lin <Wayne.Lin@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 79c9327..c58b608 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2170,6 +2170,8 @@ static int detect_mst_link_for_all_connectors(struct drm_device *dev)
                                DRM_ERROR("DM_MST: Failed to start MST\n");
                                aconnector->dc_link->type =
                                        dc_connection_single;
+                               ret = dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx,
+                                                                    aconnector->dc_link);
                                break;
                        }
                }