/*
* vpfe_pipeline_disable() - Disable streaming on a pipeline
* @vpfe_dev: vpfe device
* @pipe: VPFE pipeline
*
* Walk the entities chain starting at the pipeline output video node and stop
* all modules in the chain.
*
* Return 0 if all modules have been properly stopped, or -ETIMEDOUT if a module
* can't be stopped.
*/
static int vpfe_pipeline_disable(struct vpfe_pipeline *pipe)
{
struct media_entity_graph graph;
struct media_entity *entity;
struct v4l2_subdev *subdev;
struct media_device *mdev;
int ret = 0;
if (pipe->state == VPFE_PIPELINE_STREAM_CONTINUOUS)
entity = vpfe_get_input_entity(pipe->outputs[0]);
else
entity = &pipe->inputs[0]->video_dev.entity;
mdev = entity->parent;
mutex_lock(&mdev->graph_mutex);
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
continue;
subdev = media_entity_to_v4l2_subdev(entity);
ret = v4l2_subdev_call(subdev, video, s_stream, 0);
if (ret < 0 && ret != -ENOIOCTLCMD)
break;
}
mutex_unlock(&mdev->graph_mutex);
return ret ? -ETIMEDOUT : 0;
}
/*
* vpfe_pipeline_enable() - Enable streaming on a pipeline
* @vpfe_dev: vpfe device
* @pipe: vpfe pipeline
*
* Walk the entities chain starting at the pipeline output video node and start
* all modules in the chain in the given mode.
*
* Return 0 if successful, or the return value of the failed video::s_stream
* operation otherwise.
*/
static int vpfe_pipeline_enable(struct vpfe_pipeline *pipe)
{
struct media_entity *entity;
struct v4l2_subdev *subdev;
struct media_device *mdev;
int ret;
if (pipe->state == VPFE_PIPELINE_STREAM_CONTINUOUS)
entity = vpfe_get_input_entity(pipe->outputs[0]);
else
entity = &pipe->inputs[0]->video_dev.entity;
mdev = entity->graph_obj.mdev;
mutex_lock(&mdev->graph_mutex);
ret = media_graph_walk_init(&pipe->graph, mdev);
if (ret)
goto out;
media_graph_walk_start(&pipe->graph, entity);
while ((entity = media_graph_walk_next(&pipe->graph))) {
if (!is_media_entity_v4l2_subdev(entity))
continue;
subdev = media_entity_to_v4l2_subdev(entity);
ret = v4l2_subdev_call(subdev, video, s_stream, 1);
if (ret < 0 && ret != -ENOIOCTLCMD)
break;
}
out:
if (ret)
media_graph_walk_cleanup(&pipe->graph);
mutex_unlock(&mdev->graph_mutex);
return ret;
}