LinuxTV Patchwork [v3,30/31] rcar-csi2: expose the subdevice internal routing

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Submitter Jacopo Mondi
Date March 5, 2019, 6:51 p.m.
Message ID <20190305185150.20776-31-jacopo+renesas@jmondi.org>
Download mbox | patch
Permalink /patch/54882/
State New
Headers show

Comments

Jacopo Mondi - March 5, 2019, 6:51 p.m.
From: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Expose the subdevice internal routing from the single multiplexed sink
pad to its source pads by implementing .get_routing(). This information
is used to do link validation at stream start and allows user-space to
view the route configuration.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 53 +++++++++++++++++++++
 1 file changed, 53 insertions(+)

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index f9cc99ba00bc..cc7077b40f18 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -341,6 +341,14 @@  static int rcsi2_pad_to_vc(unsigned int pad)
 	return pad - RCAR_CSI2_SOURCE_VC0;
 }
 
+static int rcsi2_vc_to_pad(unsigned int vc)
+{
+	if (vc > 3)
+		return -EINVAL;
+
+	return vc + RCAR_CSI2_SOURCE_VC0;
+}
+
 struct rcar_csi2_info {
 	int (*init_phtw)(struct rcar_csi2 *priv, unsigned int mbps);
 	int (*confirm_start)(struct rcar_csi2 *priv);
@@ -705,9 +713,54 @@  static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
 	.s_stream = rcsi2_s_stream,
 };
 
+static int rcsi2_get_routing(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_krouting *routing)
+{
+	struct v4l2_subdev_route *r = routing->routes;
+	struct rcar_csi2 *priv = sd_to_csi2(sd);
+	struct v4l2_mbus_frame_desc fd;
+	unsigned int i;
+	int ret;
+
+	/* Get information about multiplexed link */
+	ret = rcsi2_get_remote_frame_desc(priv, &fd);
+	if (ret)
+		return ret;
+
+	if (routing->num_routes < fd.num_entries) {
+		routing->num_routes = fd.num_entries;
+		return -ENOSPC;
+	}
+
+	routing->num_routes = fd.num_entries;
+
+	for (i = 0; i < fd.num_entries; i++) {
+		struct v4l2_mbus_frame_desc_entry *entry = &fd.entry[i];
+		int source_pad;
+
+		source_pad = rcsi2_vc_to_pad(entry->bus.csi2.channel);
+		if (source_pad < 0) {
+			dev_err(priv->dev, "Virtual Channel out of range: %u\n",
+				entry->bus.csi2.channel);
+			return -EINVAL;
+		}
+
+		r->sink_pad = RCAR_CSI2_SINK;
+		r->sink_stream = entry->stream;
+		r->source_pad = source_pad;
+		r->source_stream = 0;
+		r->flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE |
+			   V4L2_SUBDEV_ROUTE_FL_IMMUTABLE;
+		r++;
+	}
+
+	return 0;
+}
+
 static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
 	.set_fmt = rcsi2_set_pad_format,
 	.get_fmt = rcsi2_get_pad_format,
+	.get_routing = rcsi2_get_routing,
 };
 
 static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {

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