From: Wayne Lin <Wayne.Lin@xxxxxxx>
[Why]
Observe after suspend/resme, we can't light up mst monitors under specific
mst hub. The reason is that driver still writes DPCD DP_MSTM_CTRL after LT.
It's forbidden even we write the same value for that dpcd register.
[How]
We already resume the mst branch device dpcd settings during
resume_mst_branch_status(). Leverage drm_dp_mst_topology_queue_probe() to
only probe the topology, not calling drm_dp_mst_topology_mgr_resume() which
will set DP_MSTM_CTRL as well.
Reviewed-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@xxxxxxx>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 16 ++++------------
1 file changed, 4 insertions(+), 12 deletions(-)
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 2599a99509de..f3e8975cb2fa 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3170,8 +3170,7 @@ static int dm_resume(struct amdgpu_ip_block *ip_block)
struct dm_atomic_state *dm_state = to_dm_atomic_state(dm->atomic_obj.state);
enum dc_connection_type new_connection_type = dc_connection_none;
struct dc_state *dc_state;
- int i, r, j, ret;
- bool need_hotplug = false;
+ int i, r, j;
struct dc_commit_streams_params commit_params = {};
if (dm->dc->caps.ips_support) {
@@ -3360,23 +3359,16 @@ static int dm_resume(struct amdgpu_ip_block *ip_block)
aconnector->mst_root)
continue;
- ret = drm_dp_mst_topology_mgr_resume(&aconnector->mst_mgr, true);
-
- if (ret < 0) {
- dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx,
- aconnector->dc_link);
- need_hotplug = true;
- }
+ drm_dp_mst_topology_queue_probe(&aconnector->mst_mgr);
}
drm_connector_list_iter_end(&iter);
- if (need_hotplug)
- drm_kms_helper_hotplug_event(ddev);
-
amdgpu_dm_irq_resume_late(adev);
amdgpu_dm_smu_write_watermarks_table(adev);
+ drm_kms_helper_hotplug_event(ddev);
+
return 0;
}
--
2.34.1
