Add the set_routing() subdev operation to allow userspace to activate
routes on the R-Car CSI-2 receiver.
Routing for this device is fixed. Validate that the provided route
respects it.
Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
---
drivers/media/platform/renesas/rcar-csi2.c | 48 +++++++++++++++++++++-
1 file changed, 47 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
index ed818a6fa655..47cb12f077e5 100644
--- a/drivers/media/platform/renesas/rcar-csi2.c
+++ b/drivers/media/platform/renesas/rcar-csi2.c
@@ -1287,6 +1287,51 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd,
return 0;
}
+static int rcsi2_apply_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_krouting *routing)
+{
+ int ret;
+
+ ret = v4l2_subdev_routing_validate(sd, routing,
+ V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+ if (ret)
+ return ret;
+
+ /*
+ * Routing is fixed for this device.
+ *
+ * Only routes in the form of CSI2:0/x->CSI2:x+1/0 are allowed.
+ *
+ * We have anyway to implement set_routing to mark the route as active.
+ */
+ for (unsigned int i = 0; i < routing->num_routes; ++i) {
+ const struct v4l2_subdev_route *route = &routing->routes[i];
+ unsigned int pad = route->sink_stream + 1;
+
+ if (route->sink_pad != 0)
+ return -EINVAL;
+
+ if (route->source_pad != pad || route->source_stream != 0)
+ return -EINVAL;
+ }
+
+ return v4l2_subdev_set_routing(sd, state, routing);
+}
+
+static int rcsi2_set_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ enum v4l2_subdev_format_whence which,
+ struct v4l2_subdev_krouting *routing)
+{
+ struct rcar_csi2 *priv = sd_to_csi2(sd);
+
+ if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->stream_count)
+ return -EBUSY;
+
+ return rcsi2_apply_routing(sd, state, routing);
+}
+
static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
.s_stream = rcsi2_s_stream,
};
@@ -1294,6 +1339,7 @@ static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
.set_fmt = rcsi2_set_pad_format,
.get_fmt = v4l2_subdev_get_fmt,
+ .set_routing = rcsi2_set_routing,
};
static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
@@ -1353,7 +1399,7 @@ static int rcsi2_init_state(struct v4l2_subdev *sd,
.routes = routes,
};
- return v4l2_subdev_set_routing(sd, state, &routing);
+ return rcsi2_apply_routing(sd, state, &routing);
}
static const struct v4l2_subdev_internal_ops rcar_csi2_internal_ops = {
--
2.44.0
