[PATCH v5 1/2] media: imx8-isi: crossbar: Add get_frame_desc operation

[Guoniu Zhou <guoniu.zhou@oss.nxp.com>]

From: "Guoniu.zhou" <guoniu.zhou@nxp.com>

Implement the get_frame_desc pad operation for the crossbar subdev using
the v4l2_subdev_get_frame_desc_passthrough() helper. This allows the
crossbar to properly propagate frame descriptors from its sink pads to
its source pads, which is necessary for proper stream configuration in
multiplexed streams scenarios.

Signed-off-by: Guoniu.zhou <guoniu.zhou@nxp.com>
---
Changes in v5:
- Use v4l2_subdev_get_frame_desc_passthrough helper
- Rewrote commit message

Changes in v4:
- Use %d instead of %u for ret variable in error messages
- Fix potential -ENOIOCTLCMD leak by resetting ret to 0 on continue

Changes in v3:
- New patch added based on feedback from Laurent Pinchart
---
 drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
index 605a45124103..0b593aed618b 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
@@ -404,6 +404,7 @@ static const struct v4l2_subdev_pad_ops mxc_isi_crossbar_subdev_pad_ops = {
 	.enum_mbus_code = mxc_isi_crossbar_enum_mbus_code,
 	.get_fmt = v4l2_subdev_get_fmt,
 	.set_fmt = mxc_isi_crossbar_set_fmt,
+	.get_frame_desc = v4l2_subdev_get_frame_desc_passthrough,
 	.set_routing = mxc_isi_crossbar_set_routing,
 	.enable_streams = mxc_isi_crossbar_enable_streams,
 	.disable_streams = mxc_isi_crossbar_disable_streams,

-- 
2.34.1