/*
* 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;
}
/*
* 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;
}
/*
* omap4iss_pipeline_pm_use - Update the use count of an entity
* @entity: The entity
* @use: Use (1) or stop using (0) the entity
*
* Update the use count of all entities in the pipeline and power entities on or
* off accordingly.
*
* Return 0 on success or a negative error code on failure. Powering entities
* off is assumed to never fail. No failure can occur when the use parameter is
* set to 0.
*/
int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
{
int change = use ? 1 : -1;
int ret;
mutex_lock(&entity->parent->graph_mutex);
/* Apply use count to node. */
entity->use_count += change;
WARN_ON(entity->use_count < 0);
/* Apply power change to connected non-nodes. */
ret = iss_pipeline_pm_power(entity, change);
if (ret < 0)
entity->use_count -= change;
mutex_unlock(&entity->parent->graph_mutex);
return ret;
}
