media: v4l2-subdev: Add v4l2_subdev_state_xlate_streams() helper

Add a helper function to translate streams between two pads of a subdev,
using the subdev's internal routing table.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index d7e157c..13f1a10 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1615,6 +1615,32 @@ 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)
+{
+       const struct v4l2_subdev_krouting *routing = &state->routing;
+       struct v4l2_subdev_route *route;
+       u64 streams0 = 0;
+       u64 streams1 = 0;
+
+       for_each_active_route(routing, route) {
+               if (route->sink_pad == pad0 && route->source_pad == pad1 &&
+                   (*streams & BIT_ULL(route->sink_stream))) {
+                       streams0 |= BIT_ULL(route->sink_stream);
+                       streams1 |= BIT_ULL(route->source_stream);
+               }
+               if (route->source_pad == pad0 && route->sink_pad == pad1 &&
+                   (*streams & BIT_ULL(route->source_stream))) {
+                       streams0 |= BIT_ULL(route->source_stream);
+                       streams1 |= BIT_ULL(route->sink_stream);
+               }
+       }
+
+       *streams = streams0;
+       return streams1;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_state_xlate_streams);
+
 int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
                                 const struct v4l2_subdev_krouting *routing,
                                 enum v4l2_subdev_routing_restriction disallow)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 06c254f..8ef0d26 100644 (file)
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1585,6 +1585,29 @@ 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
+ *
+ * @state: Subdevice state
+ * @pad0: The first pad
+ * @pad1: The second pad
+ * @streams: Streams bitmask on the first pad
+ *
+ * Streams on sink pads of a subdev are routed to source pads as expressed in
+ * 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, and updates @streams with the streams that have been found in the
+ * routing table.
+ *
+ * @pad0 and @pad1 must be a sink and a source, in any order.
+ *
+ * Return: The bitmask of streams of @pad1 that are routed to @streams on @pad0.
+ */
+u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
+                                   u32 pad0, u32 pad1, u64 *streams);
+
+/**
  * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
  *
  * @V4L2_SUBDEV_ROUTING_NO_1_TO_N: