[PATCH 5/5] drm/amdgpu: add DisplayPort CEC-Tunneling-over-AUX support

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil at cisco.com>

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

Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 13 +++++++++++--
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c |  2 ++
 2 files changed, 13 insertions(+), 2 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 34f34823bab5..77898c95bef6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -898,6 +898,7 @@ 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;
@@ -905,10 +906,13 @@ 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;
@@ -1059,12 +1063,16 @@ static void handle_hpd_rx_irq(void *param)
 			drm_kms_helper_hotplug_event(dev);
 		}
 	}
+
 	if ((dc_link->cur_link_settings.lane_count != LANE_COUNT_UNKNOWN) ||
-	    (dc_link->type == dc_connection_mst_branch))
+	    (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)
@@ -2732,6 +2740,7 @@ 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,
-- 
2.18.0