[PATCH v12 59/86] media: imx219: Report streams using frame descriptors

Sakari Ailus
2026-04-09T20:15:03Z

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Implement the .get_frame_desc() subdev operation to report information
about streams to the connected CSI-2 receiver. This is required to let
the CSI-2 receiver driver know about virtual channels and data types for
each stream.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
drivers/media/i2c/imx219.c | 48 ++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index e79b26268415..d695987839e4 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -23,6 +23,7 @@
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>

+#include <media/mipi-csi2.h>
#include <media/v4l2-cci.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
@@ -669,6 +670,24 @@ static void imx219_free_controls(struct imx219 *imx219)
* Subdev operations
*/

+static unsigned int imx219_format_bpp(u32 code)
+{
+ switch (code) {
+ case MEDIA_BUS_FMT_SRGGB8_1X8:
+ case MEDIA_BUS_FMT_SGRBG8_1X8:
+ case MEDIA_BUS_FMT_SGBRG8_1X8:
+ case MEDIA_BUS_FMT_SBGGR8_1X8:
+ return 8;
+
+ case MEDIA_BUS_FMT_SRGGB10_1X10:
+ case MEDIA_BUS_FMT_SGRBG10_1X10:
+ case MEDIA_BUS_FMT_SGBRG10_1X10:
+ case MEDIA_BUS_FMT_SBGGR10_1X10:
+ default:
+ return 10;
+ }
+}
+
static int imx219_set_framefmt(struct imx219 *imx219,
struct v4l2_subdev_state *state)
{
@@ -1046,6 +1065,34 @@ static int imx219_get_selection(struct v4l2_subdev *sd,
}
}

+static int imx219_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_frame_desc *fd)
+{
+ const struct v4l2_mbus_framefmt *fmt;
+ struct v4l2_subdev_state *state;
+ u32 code;
+
+ if (pad != IMX219_PAD_SOURCE)
+ return -EINVAL;
+
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+ fmt = v4l2_subdev_state_get_format(state, IMX219_PAD_SOURCE,
+ IMX219_STREAM_IMAGE);
+ code = fmt->code;
+ v4l2_subdev_unlock_state(state);
+
+ fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+ fd->num_entries = 1;
+
+ fd->entry[0].pixelcode = code;
+ fd->entry[0].stream = IMX219_STREAM_IMAGE;
+ fd->entry[0].bus.csi2.vc = 0;
+ fd->entry[0].bus.csi2.dt = imx219_format_bpp(code) == 8 ?
+ MIPI_CSI2_DT_RAW8 : MIPI_CSI2_DT_RAW10;
+
+ return 0;
+}
+
static int imx219_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
@@ -1117,6 +1164,7 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
.set_fmt = imx219_set_pad_format,
.get_selection = imx219_get_selection,
.enum_frame_size = imx219_enum_frame_size,
+ .get_frame_desc = imx219_get_frame_desc,
.enable_streams = imx219_enable_streams,
.disable_streams = imx219_disable_streams,
};
--
2.47.3