6.6-stable review patch. If anyone has any objections, please let me know.
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From: Wayne Lin Wayne.Lin@amd.com
commit bc068194f548ef1f230d96c4398046bf59165992 upstream.
[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@amd.com Signed-off-by: Wayne Lin Wayne.Lin@amd.com Signed-off-by: Zaeem Mohamed zaeem.mohamed@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com [cascardo: adjust context in local declarations] Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2825,8 +2825,7 @@ static int dm_resume(void *handle) 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;
if (amdgpu_in_reset(adev)) { dc_state = dm->cached_dc_state; @@ -3003,23 +3002,16 @@ static int dm_resume(void *handle) 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; }