Hi Prabhakar,
Thank you for the patch.
On Tue, Sep 10, 2024 at 06:06:10PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>
> 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: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> ---
> drivers/media/i2c/ov5645.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index 7f1133292ffc..c24eb6e7a7b5 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -28,6 +28,7 @@
> #include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/types.h>
> +#include <media/mipi-csi2.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-event.h>
> #include <media/v4l2-fwnode.h>
> @@ -829,6 +830,32 @@ static const struct v4l2_ctrl_ops ov5645_ctrl_ops = {
> .s_ctrl = ov5645_s_ctrl,
> };
>
> +static int ov5645_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;
> +
> + if (pad != OV5645_PAD_SOURCE)
> + return -EINVAL;
> +
> + state = v4l2_subdev_lock_and_get_active_state(sd);
> + fmt = v4l2_subdev_state_get_format(state, OV5645_PAD_SOURCE, 0);
> + v4l2_subdev_unlock_state(state);
Once you unlock the state fmt could change, so you should instead do
state = v4l2_subdev_lock_and_get_active_state(sd);
code = v4l2_subdev_state_get_format(state, OV5645_PAD_SOURCE, 0)->code;
v4l2_subdev_unlock_state(state);
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> +
> + fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> + fd->num_entries = 1;
> +
> + memset(fd->entry, 0, sizeof(fd->entry));
> +
> + fd->entry[0].pixelcode = fmt->code;
> + fd->entry[0].stream = 0;
> + fd->entry[0].bus.csi2.vc = 0;
> + fd->entry[0].bus.csi2.dt = MIPI_CSI2_DT_YUV422_8B;
> +
> + return 0;
> +}
> +
> static int ov5645_enum_mbus_code(struct v4l2_subdev *sd,
> struct v4l2_subdev_state *sd_state,
> struct v4l2_subdev_mbus_code_enum *code)
> @@ -1062,6 +1089,7 @@ static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> };
>
> static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> + .get_frame_desc = ov5645_get_frame_desc,
> .enum_mbus_code = ov5645_enum_mbus_code,
> .enum_frame_size = ov5645_enum_frame_size,
> .get_fmt = v4l2_subdev_get_fmt,
--
Regards,
Laurent Pinchart
