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@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 31 +++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 18 ++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index c31b44800e39..b16121485f79 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1056,6 +1056,37 @@ 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)
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 4934dc9468a8..45c41f4d6a2b 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1241,6 +1241,24 @@ 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
*
--
2.34.1
