The routing information is essential in link validation for multiplexed
links: the pads at the ends of a multiplexed link have no single format
defined for them. Instead, the format is accessible in the sink (or
source) pads of the sub-devices at both ends of that link.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 138 ++++++++++++++++++++++++++
1 file changed, 138 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 430dbdaab080..e0cb5b7d84a7 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1094,6 +1094,140 @@ int v4l2_subdev_get_format_dir(struct media_pad *pad, u16 stream,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_format_dir);
+static int v4l2_subdev_link_validate_routing_stream(
+ struct media_link *link, struct media_pad *sink_pad, u16 sink_stream,
+ struct media_pad *source_pad, u16 source_stream)
+{
+ struct v4l2_subdev_format source_fmt;
+ struct v4l2_subdev_format sink_fmt;
+ struct v4l2_subdev *sink_sd;
+ int ret;
+
+ ret = v4l2_subdev_get_format_dir(sink_pad, sink_stream,
+ V4L2_DIR_SINKWARD, &sink_fmt);
+ if (ret)
+ return ret;
+
+ ret = v4l2_subdev_get_format_dir(source_pad, source_stream,
+ V4L2_DIR_SOURCEWARD, &source_fmt);
+ if (ret)
+ return ret;
+
+ sink_sd = media_entity_to_v4l2_subdev(sink_pad->entity);
+
+ ret = v4l2_subdev_call(sink_sd, pad, link_validate, link, &source_fmt,
+ &sink_fmt);
+ if (ret != -ENOIOCTLCMD)
+ return ret;
+
+ ret = v4l2_subdev_link_validate_default(sink_sd, link, &source_fmt,
+ &sink_fmt);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int v4l2_subdev_link_validate_routing(struct media_link *link)
+{
+ int ret;
+ unsigned int i, j;
+
+ struct route_info {
+ struct v4l2_subdev_krouting routing;
+ struct media_pad *pad;
+ struct v4l2_subdev *subdev;
+ };
+
+ struct route_info source_route_info = {
+ .pad = link->source,
+ .subdev = media_entity_to_v4l2_subdev(link->source->entity),
+ };
+
+ struct route_info sink_route_info = {
+ .pad = link->sink,
+ .subdev = media_entity_to_v4l2_subdev(link->sink->entity),
+ };
+
+ struct device *dev = sink_route_info.subdev->entity.graph_obj.mdev->dev;
+
+ dev_dbg(dev, "validating link \"%s\":%u -> \"%s\":%u\n",
+ link->source->entity->name, link->source->index,
+ link->sink->entity->name, link->sink->index);
+
+ ret = v4l2_subdev_get_krouting(source_route_info.subdev,
+ &source_route_info.routing);
+ if (ret)
+ return ret;
+
+ ret = v4l2_subdev_get_krouting(sink_route_info.subdev,
+ &sink_route_info.routing);
+ if (ret) {
+ v4l2_subdev_free_routing(&source_route_info.routing);
+ return ret;
+ }
+
+ /*
+ * Every active sink route needs an active source route, but it's ok
+ * to have active source routes without matching sink route.
+ */
+ for (i = 0; i < sink_route_info.routing.num_routes; ++i) {
+ struct v4l2_subdev_route *sink_route =
+ &sink_route_info.routing.routes[i];
+
+ if (!(sink_route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
+ continue;
+
+ if (sink_route->sink_pad != sink_route_info.pad->index)
+ continue;
+
+ for (j = 0; j < source_route_info.routing.num_routes; ++j) {
+ struct v4l2_subdev_route *source_route =
+ &source_route_info.routing.routes[j];
+
+ if (!(source_route->flags &
+ V4L2_SUBDEV_ROUTE_FL_ACTIVE))
+ continue;
+
+ if (source_route->source_pad !=
+ source_route_info.pad->index)
+ continue;
+
+ if (source_route->source_stream !=
+ sink_route->sink_stream)
+ continue;
+
+ ret = v4l2_subdev_link_validate_routing_stream(
+ link,
+ &sink_route_info.pad->entity
+ ->pads[sink_route->sink_pad],
+ sink_route->sink_stream,
+ &source_route_info.pad->entity
+ ->pads[source_route->source_pad],
+ source_route->source_stream);
+ if (ret)
+ goto out;
+
+ break;
+ }
+
+ if (j == source_route_info.routing.num_routes) {
+ dev_err(dev,
+ "%s: no active source route found for sink route '%s':%u:%u\n",
+ __func__, sink_route_info.pad->entity->name,
+ sink_route->sink_pad, sink_route->sink_stream);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+out:
+ v4l2_subdev_free_routing(&source_route_info.routing);
+ v4l2_subdev_free_routing(&sink_route_info.routing);
+
+ return ret;
+}
+
int v4l2_subdev_link_validate(struct media_link *link)
{
struct v4l2_subdev *sink;
@@ -1102,11 +1236,15 @@ int v4l2_subdev_link_validate(struct media_link *link)
rval = v4l2_subdev_link_validate_get_format(
link->source, &source_fmt);
+ if (rval == -ENOIOCTLCMD)
+ return v4l2_subdev_link_validate_routing(link);
if (rval < 0)
return 0;
rval = v4l2_subdev_link_validate_get_format(
link->sink, &sink_fmt);
+ if (rval == -ENOIOCTLCMD)
+ return v4l2_subdev_link_validate_routing(link);
if (rval < 0)
return 0;
--
2.25.1
