Re: [PATCH v5 1/5] media: qcom: camss: Add V4L2 meta format for CAMSS ISP parameters

Hi Loic,

On 7/24/2026 3:42 PM, Loic Poulain wrote:
> Add a V4L2 meta format code (V4L2_META_FMT_QCOM_ISP_PARAMS) for the
> Qualcomm CAMSS ISP parameter buffer. This format is used by the params
> video node exposed by CAMSS offline ISP drivers (e.g. OPE) to carry
> ISP tuning data such as white balance, color correction and chroma
> enhancement settings.
> 
> Signed-off-by: Loic Poulain <[email protected]>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>  include/uapi/linux/videodev2.h       | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 98512ea4cc5b9d725e1851af2ed38df85bb4fa8c..7b6e9a9a514f037190d55d59409dd6cc97522943 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1471,6 +1471,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_META_FMT_C3ISP_STATS:		descr = "Amlogic C3 ISP Statistics"; break;
>  	case V4L2_META_FMT_MALI_C55_PARAMS:	descr = "ARM Mali-C55 ISP Parameters"; break;
>  	case V4L2_META_FMT_MALI_C55_STATS:	descr = "ARM Mali-C55 ISP 3A Statistics"; break;
> +	case V4L2_META_FMT_QCOM_ISP_PARAMS:	descr = "Qualcomm CAMSS ISP Parameters"; break;
>  	case V4L2_PIX_FMT_NV12_8L128:	descr = "NV12 (8x128 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12M_8L128:	descr = "NV12M (8x128 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12_10BE_8L128:	descr = "10-bit NV12 (8x128 Linear, BE)"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index add08188f06890182a5c399a223c1ab0a546cae1..011026194a20cde22a374e6fb2570cbc6bced230 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -888,6 +888,9 @@ struct v4l2_pix_format {
>  #define V4L2_META_FMT_MALI_C55_PARAMS	v4l2_fourcc('C', '5', '5', 'P') /* ARM Mali-C55 Parameters */
>  #define V4L2_META_FMT_MALI_C55_STATS	v4l2_fourcc('C', '5', '5', 'S') /* ARM Mali-C55 3A Statistics */
>  
> +/* Vendor specific - used for Qualcomm CAMSS offline ISP */

It seems that this is generic format for ISP parameters, can we update the comment and remove offline. The proposal:
/* Vendor specific - used for Qualcomm CAMSS ISP */

~Gjorgji