Пример #1
0
/*
 * iss_pipeline_link_notify - Link management notification callback
 * @link: The link
 * @flags: New link flags that will be applied
 *
 * React to link management on powered pipelines by updating the use count of
 * all entities in the source and sink sides of the link. Entities are powered
 * on or off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. This function will not fail for disconnection
 * events.
 */
static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
				    unsigned int notification)
{
	struct media_entity *source = link->source->entity;
	struct media_entity *sink = link->sink->entity;
	int source_use = iss_pipeline_pm_use_count(source);
	int sink_use = iss_pipeline_pm_use_count(sink);
	int ret;

	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
	    !(link->flags & MEDIA_LNK_FL_ENABLED)) {
		/* Powering off entities is assumed to never fail. */
		iss_pipeline_pm_power(source, -sink_use);
		iss_pipeline_pm_power(sink, -source_use);
		return 0;
	}

	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
		(flags & MEDIA_LNK_FL_ENABLED)) {
		ret = iss_pipeline_pm_power(source, sink_use);
		if (ret < 0)
			return ret;

		ret = iss_pipeline_pm_power(sink, source_use);
		if (ret < 0)
			iss_pipeline_pm_power(source, -sink_use);

		return ret;
	}

	return 0;
}
Пример #2
0
/*
 * iss_pipeline_link_notify - Link management notification callback
 * @link: The link
 * @flags: New link flags that will be applied
 *
 * React to link management on powered pipelines by updating the use count of
 * all entities in the source and sink sides of the link. Entities are powered
 * on or off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. This function will not fail for disconnection
 * events.
 */
static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
				    unsigned int notification)
{
	struct media_entity_graph *graph =
		&container_of(link->graph_obj.mdev, struct iss_device,
			      media_dev)->pm_count_graph;
	struct media_entity *source = link->source->entity;
	struct media_entity *sink = link->sink->entity;
	int source_use;
	int sink_use;
	int ret;

	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
		ret = media_entity_graph_walk_init(graph,
						   link->graph_obj.mdev);
		if (ret)
			return ret;
	}

	source_use = iss_pipeline_pm_use_count(source, graph);
	sink_use = iss_pipeline_pm_use_count(sink, graph);

	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
	    !(flags & MEDIA_LNK_FL_ENABLED)) {
		/* Powering off entities is assumed to never fail. */
		iss_pipeline_pm_power(source, -sink_use, graph);
		iss_pipeline_pm_power(sink, -source_use, graph);
		return 0;
	}

	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
	    (flags & MEDIA_LNK_FL_ENABLED)) {
		ret = iss_pipeline_pm_power(source, sink_use, graph);
		if (ret < 0)
			return ret;

		ret = iss_pipeline_pm_power(sink, source_use, graph);
		if (ret < 0)
			iss_pipeline_pm_power(source, -sink_use, graph);
	}

	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH)
		media_entity_graph_walk_cleanup(graph);

	return ret;
}