[PATCH v2 1/3] media: v4l: subdev: add v4l2_subdev_routing_xlate_streams()

[Cosmin Tanislav <demonsingur@gmail.com>]

Currently, the v4l2_subdev_state_xlate_streams() function is used
to translate streams from one pad to another.
This function takes the entire subdev state as argument, but only makes
use of the routing.

Introduce a v4l2_subdev_routing_xlate_streams() function which can be
used without the entire subdev state, to avoid passing the entire state
around when not needed.

Signed-off-by: Cosmin Tanislav <demonsingur@gmail.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 12 +++++++++---
 include/media/v4l2-subdev.h           | 20 +++++++++++++++++---
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index a3074f469b150..91fa51259237e 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2044,10 +2044,9 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
 }
 EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
 
-u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
-				    u32 pad0, u32 pad1, u64 *streams)
+u64 v4l2_subdev_routing_xlate_streams(const struct v4l2_subdev_krouting *routing,
+				      u32 pad0, u32 pad1, u64 *streams)
 {
-	const struct v4l2_subdev_krouting *routing = &state->routing;
 	struct v4l2_subdev_route *route;
 	u64 streams0 = 0;
 	u64 streams1 = 0;
@@ -2068,6 +2067,13 @@ u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
 	*streams = streams0;
 	return streams1;
 }
+EXPORT_SYMBOL_GPL(v4l2_subdev_routing_xlate_streams);
+
+u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
+				    u32 pad0, u32 pad1, u64 *streams)
+{
+	return v4l2_subdev_routing_xlate_streams(&state->routing, pad0, pad1, streams);
+}
 EXPORT_SYMBOL_GPL(v4l2_subdev_state_xlate_streams);
 
 int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 57f2bcb4eb16c..e49dba3c59bd6 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1584,9 +1584,9 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
 					     u32 pad, u32 stream);
 
 /**
- * v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another
+ * v4l2_subdev_routing_xlate_streams() - Translate streams from one pad to another
  *
- * @state: Subdevice state
+ * @routing: Routing used to translate streams from one pad to another
  * @pad0: The first pad
  * @pad1: The second pad
  * @streams: Streams bitmask on the first pad
@@ -1595,7 +1595,7 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
  * the subdev state routing table. Stream numbers don't necessarily match on
  * the sink and source side of a route. This function translates stream numbers
  * on @pad0, expressed as a bitmask in @streams, to the corresponding streams
- * on @pad1 using the routing table from the @state. It returns the stream mask
+ * on @pad1 using the routing table from @routing. It returns the stream mask
  * on @pad1, and updates @streams with the streams that have been found in the
  * routing table.
  *
@@ -1603,6 +1603,20 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
  *
  * Return: The bitmask of streams of @pad1 that are routed to @streams on @pad0.
  */
+u64 v4l2_subdev_routing_xlate_streams(const struct v4l2_subdev_krouting *routing,
+				      u32 pad0, u32 pad1, u64 *streams);
+
+/**
+ * v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another
+ *
+ * @state: Subdevice state
+ * @pad0: The first pad
+ * @pad1: The second pad
+ * @streams: Streams bitmask on the first pad
+ *
+ * This is the same as v4l2_subdev_routing_xlate_streams, but takes subdevice
+ * state as parameter
+ */
 u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
 				    u32 pad0, u32 pad1, u64 *streams);
 
-- 
2.48.1