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media: subdev: add v4l2_subdev_has_pad_interdep()

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Add a v4l2_subdev_has_pad_interdep() helper function which can be used
for media_entity_operations.has_pad_interdep op.

It considers two pads interdependent if there is an active route between
pad0 and pad1.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2021-07-15 15:39:19 +02:00 committed by Mauro Carvalho Chehab
parent 8a54644571
commit 33c0ddbe56
2 changed files with 49 additions and 0 deletions
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31
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -1073,6 +1073,37 @@ int v4l2_subdev_link_validate(struct media_link *link)
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,
unsigned int pad0, unsigned int pad1)
{
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
struct v4l2_subdev_krouting *routing;
struct v4l2_subdev_state *state;
unsigned int i;
state = v4l2_subdev_lock_and_get_active_state(sd);
routing = &state->routing;
for (i = 0; i < routing->num_routes; ++i) {
struct v4l2_subdev_route *route = &routing->routes[i];
if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
continue;
if ((route->sink_pad == pad0 && route->source_pad == pad1) ||
(route->source_pad == pad0 && route->sink_pad == pad1)) {
v4l2_subdev_unlock_state(state);
return true;
}
}
v4l2_subdev_unlock_state(state);
return false;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_has_pad_interdep);
struct v4l2_subdev_state *
__v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
struct lock_class_key *lock_key)

18
include/media/v4l2-subdev.h
View File

@ -1246,6 +1246,24 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
*/
int v4l2_subdev_link_validate(struct media_link *link);
/**
* v4l2_subdev_has_pad_interdep - MC has_pad_interdep implementation for subdevs
*
* @entity: pointer to &struct media_entity
* @pad0: pad number for the first pad
* @pad1: pad number for the second pad
*
* This function is an implementation of the
* media_entity_operations.has_pad_interdep operation for subdevs that
* implement the multiplexed streams API (as indicated by the
* V4L2_SUBDEV_FL_STREAMS subdev flag).
*
* It considers two pads interdependent if there is an active route between pad0
* and pad1.
*/
bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,
unsigned int pad0, unsigned int pad1);
/**
* __v4l2_subdev_state_alloc - allocate v4l2_subdev_state
*