linux-kernel - [PATCH] media: i2c: vgxy61: Report stream using frame descriptors

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Message-Id: <20250704-vgxy61-frame-desc-v1-1-0e62b9c4e260@collabora.com>
Date: Fri, 04 Jul 2025 11:28:24 +0200
From: Julien Massot <julien.massot@...labora.com>
To: kernel@...labora.com, Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Benjamin Mugnier <benjamin.mugnier@...s.st.com>, 
 Sylvain Petinot <sylvain.petinot@...s.st.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Julien Massot <julien.massot@...labora.com>
Subject: [PATCH] media: i2c: vgxy61: Report stream using frame descriptors

Add support for .get_frame_desc() to report CSI-2 virtual channel
and data type information. This allows CSI-2 receivers to properly
interpret the stream without inferring the data type from the pixel
format.

Signed-off-by: Julien Massot <julien.massot@...labora.com>
---
 drivers/media/i2c/vgxy61.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/media/i2c/vgxy61.c b/drivers/media/i2c/vgxy61.c
index 5b0479f3a3c0592be430cefe5a1ab9a76812ba84..44d6c8d8fbf8d6182e42d44e129bc45945ee0da5 100644
--- a/drivers/media/i2c/vgxy61.c
+++ b/drivers/media/i2c/vgxy61.c
@@ -1181,6 +1181,21 @@ static int vgxy61_s_stream(struct v4l2_subdev *sd, int enable)
 	return ret;
 }
 
+static int vgxy61_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+				 struct v4l2_mbus_frame_desc *fd)
+{
+	struct vgxy61_dev *sensor = to_vgxy61_dev(sd);
+
+	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+	fd->num_entries = 1;
+	fd->entry[0].pixelcode = sensor->fmt.code;
+	fd->entry[0].stream = 0;
+	fd->entry[0].bus.csi2.vc = 0;
+	fd->entry[0].bus.csi2.dt = get_data_type_by_code(sensor->fmt.code);
+
+	return 0;
+}
+
 static int vgxy61_set_fmt(struct v4l2_subdev *sd,
 			  struct v4l2_subdev_state *sd_state,
 			  struct v4l2_subdev_format *format)
@@ -1402,6 +1417,7 @@ static const struct v4l2_subdev_pad_ops vgxy61_pad_ops = {
 	.set_fmt = vgxy61_set_fmt,
 	.get_selection = vgxy61_get_selection,
 	.enum_frame_size = vgxy61_enum_frame_size,
+	.get_frame_desc = vgxy61_get_frame_desc,
 };
 
 static const struct v4l2_subdev_ops vgxy61_subdev_ops = {

---
base-commit: 1343433ed38923a21425c602e92120a1f1db5f7a
change-id: 20250704-vgxy61-frame-desc-2a6d3c6cab43

Best regards,
-- 
Julien Massot <julien.massot@...labora.com>