[PATCH RFC 11/21] media: cadence: csi2rx: add get_frame_desc wrapper

[Jai Luthra <j-luthra@ti.com>]

From: Pratyush Yadav <p.yadav@ti.com>

J721E wrapper CSI2RX driver needs to get the frame descriptor from the
source to find out info about virtual channel. This driver itself does
not touch the routing or virtual channels in any way. So simply pass the
descriptor through from the source.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
---
 drivers/media/platform/cadence/cdns-csi2rx.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index e19993ed351c..989924dba9a9 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -139,6 +139,21 @@ static const struct csi2rx_fmt *csi2rx_get_fmt_by_code(u32 code)
 	return NULL;
 }
 
+static int csi2rx_get_frame_desc_from_source(struct csi2rx_priv *csi2rx,
+					     struct v4l2_mbus_frame_desc *fd)
+{
+	struct media_pad *remote_pad;
+
+	remote_pad = media_entity_remote_source_pad_unique(&csi2rx->subdev.entity);
+	if (!remote_pad) {
+		dev_err(csi2rx->dev, "No remote pad found for sink\n");
+		return -ENODEV;
+	}
+
+	return v4l2_subdev_call(csi2rx->source_subdev, pad, get_frame_desc,
+				remote_pad->index, fd);
+}
+
 static inline
 struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
 {
@@ -470,10 +485,19 @@ static int csi2rx_init_state(struct v4l2_subdev *subdev,
 	return csi2rx_set_fmt(subdev, state, &format);
 }
 
+static int csi2rx_get_frame_desc(struct v4l2_subdev *subdev, unsigned int pad,
+				 struct v4l2_mbus_frame_desc *fd)
+{
+	struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
+
+	return csi2rx_get_frame_desc_from_source(csi2rx, fd);
+}
+
 static const struct v4l2_subdev_pad_ops csi2rx_pad_ops = {
 	.enum_mbus_code	= csi2rx_enum_mbus_code,
 	.get_fmt	= v4l2_subdev_get_fmt,
 	.set_fmt	= csi2rx_set_fmt,
+	.get_frame_desc = csi2rx_get_frame_desc,
 };
 
 static const struct v4l2_subdev_video_ops csi2rx_video_ops = {

-- 
2.43.0