drm/amdgpu: add DisplayPort CEC-Tunneling-over-AUX support

Add DisplayPort CEC-Tunneling-over-AUX support to amdgpu.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/de9586bb-151e-bae9-b8e3-14db107a60df@xs4all.nl

2 files changed, 10 insertions, 1 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 11d6dd23eeb8..af6adffba788 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -896,6 +896,7 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
                 aconnector->dc_sink = sink;
                 if (sink->dc_edid.length == 0) {
                         aconnector->edid = NULL;
+                        drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
                 } else {
                         aconnector->edid =
                                 (struct edid *) sink->dc_edid.raw_edid;
@@ -903,10 +904,13 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
 
                         drm_connector_update_edid_property(connector,
                                         aconnector->edid);
+                        drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
+                                            aconnector->edid);
                 }
                 amdgpu_dm_add_sink_to_freesync_module(connector, aconnector->edid);
 
         } else {
+                drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
                 amdgpu_dm_remove_sink_from_freesync_module(connector);
                 drm_connector_update_edid_property(connector, NULL);
                 aconnector->num_modes = 0;
@@ -1061,8 +1065,10 @@ static void handle_hpd_rx_irq(void *param)
             (dc_link->type == dc_connection_mst_branch))
                 dm_handle_hpd_rx_irq(aconnector);
 
-        if (dc_link->type != dc_connection_mst_branch)
+        if (dc_link->type != dc_connection_mst_branch) {
+                drm_dp_cec_irq(&aconnector->dm_dp_aux.aux);
                 mutex_unlock(&aconnector->hpd_lock);
+        }
 }
 
 static void register_hpd_handlers(struct amdgpu_device *adev)
@@ -2731,6 +2737,7 @@ static void amdgpu_dm_connector_destroy(struct drm_connector *connector)
                 dm->backlight_dev = NULL;
         }
 #endif
+        drm_dp_cec_unregister_connector(&aconnector->dm_dp_aux.aux);
         drm_connector_unregister(connector);
         drm_connector_cleanup(connector);
         kfree(connector);
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 9a300732ba37..18a3a6e5ffa0 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -496,6 +496,8 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
         aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
 
         drm_dp_aux_register(&aconnector->dm_dp_aux.aux);
+        drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
+                                      aconnector->base.name, dm->adev->dev);
         aconnector->mst_mgr.cbs = &dm_mst_cbs;
         drm_dp_mst_topology_mgr_init(
                 &aconnector->mst_mgr,