linux-kernel - Re: [PATCH 17/18] media: videodev2.h, v4l2-ioctl: Add microchip statistics format

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Message-ID: <51c19bc4-35cb-43ea-a4d6-4496142baa9e@kernel.org>
Date: Mon, 10 Nov 2025 09:49:47 +0100
From: Hans Verkuil <hverkuil+cisco@...nel.org>
To: Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Eugen Hristev <eugen.hristev@...aro.org>, Chas Williams
 <3chas3@...il.com>, Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>,
 Balakrishnan Sambath <balakrishnan.s@...rochip.com>,
 Hans Verkuil <hverkuil@...nel.org>, Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
 Jacopo Mondi <jacopo.mondi@...asonboard.com>,
 Daniel Scally <dan.scally+renesas@...asonboard.com>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 17/18] media: videodev2.h, v4l2-ioctl: Add microchip
 statistics format

On 09/10/2025 17:52, Balamanikandan Gunasundar wrote:
> Add microchip ISC specific statistics meta data format. This data consists
> of raw histogram statistics that is exported to userspace for further
> processing. This fixes the kernel warning "Unknown pixelformat"
> 
> Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>
> ---
>  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 01cf52c3ea33..a03e8f3ab610 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1467,6 +1467,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_META_FMT_RK_ISP1_PARAMS:	descr = "Rockchip ISP1 3A Parameters"; break;
>  	case V4L2_META_FMT_RK_ISP1_STAT_3A:	descr = "Rockchip ISP1 3A Statistics"; break;
>  	case V4L2_META_FMT_RK_ISP1_EXT_PARAMS:	descr = "Rockchip ISP1 Ext 3A Params"; break;
> +	case V4L2_META_FMT_ISC_STAT_3A: descr = "Microchip ISP statistics"; break;

statistics -> Statistics

>  	case V4L2_META_FMT_C3ISP_PARAMS:	descr = "Amlogic C3 ISP Parameters"; break;
>  	case V4L2_META_FMT_C3ISP_STATS:		descr = "Amlogic C3 ISP Statistics"; break;
>  	case V4L2_PIX_FMT_NV12_8L128:	descr = "NV12 (8x128 Linear)"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index becd08fdbddb..ba628f9bb89f 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -875,6 +875,9 @@ struct v4l2_pix_format {
>  #define V4L2_META_FMT_RK_ISP1_STAT_3A	v4l2_fourcc('R', 'K', '1', 'S') /* Rockchip ISP1 3A Statistics */
>  #define V4L2_META_FMT_RK_ISP1_EXT_PARAMS	v4l2_fourcc('R', 'K', '1', 'E') /* Rockchip ISP1 3a Extensible Parameters */
>  
> +/* Vendor specific - used for Microchip camera sub-system */
> +#define V4L2_META_FMT_ISC_STAT_3A      v4l2_fourcc('I', 'S', 'C', 'S')
> +
>  /* Vendor specific - used for C3_ISP */
>  #define V4L2_META_FMT_C3ISP_PARAMS	v4l2_fourcc('C', '3', 'P', 'M') /* Amlogic C3 ISP Parameters */
>  #define V4L2_META_FMT_C3ISP_STATS	v4l2_fourcc('C', '3', 'S', 'T') /* Amlogic C3 ISP Statistics */

This meta format must be documented just like e.g. V4L2_META_FMT_C3ISP_STATS.

Regards,

	Hans