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

[Harry Wentland]

On 2018-08-17 10:11 AM, Hans Verkuil wrote:
> 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>
> Acked-by: Alex Deucher <alexander.deucher at amd.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);
> +	}

These lines don't really add anything functional.

Either way, this patch is
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

>  
> -	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,
>