linux-kernel - Re: [PATCH v7 05/11] drm/fourcc: Add DRM_FORMAT

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Message-ID: <20260128120329.GH2558360@killaraus>
Date: Wed, 28 Jan 2026 14:03:29 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Vishal Sagar <vishal.sagar@....com>,
	Anatoliy Klymenko <anatoliy.klymenko@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Michal Simek <michal.simek@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Pekka Paalanen <ppaalanen@...il.com>
Subject: Re: [PATCH v7 05/11] drm/fourcc: Add DRM_FORMAT_X403

Hi Tomi,

Thank you for the patch.

On Mon, Dec 01, 2025 at 02:18:47PM +0200, Tomi Valkeinen wrote:
> Add X403, a 3 plane 10 bits per component non-subsampled YCbCr format.

This makes me wish for a X509 format, for maximum confusion :-)

> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Reviewed-by: Vishal Sagar <vishal.sagar@....com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/drm_fourcc.c  | 3 +++
>  include/uapi/drm/drm_fourcc.h | 9 +++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 0d222f6c1a30..ab643dedd6d4 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -391,6 +391,9 @@ const struct drm_format_info *__drm_format_info(u32 format)
>  		{ .format = DRM_FORMAT_Y10_P32,		.depth = 0,  .num_planes = 1,
>  		  .char_per_block = { 4, 0, 0 }, .block_w = { 3, 0, 0 }, .block_h = { 1, 0, 0 },
>  		  .hsub = 1, .vsub = 1, .is_yuv = true },
> +		{ .format = DRM_FORMAT_X403,		.depth = 0,  .num_planes = 3,
> +		  .char_per_block = { 4, 4, 4 }, .block_w = { 3, 3, 3 }, .block_h = { 1, 1, 1 },
> +		  .hsub = 1, .vsub = 1, .is_yuv = true },
>  	};
>  
>  	unsigned int i;
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 0fd99ae32a06..abe6af8b5ac4 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -403,6 +403,15 @@ extern "C" {
>   */
>  #define DRM_FORMAT_Q401		fourcc_code('Q', '4', '0', '1')
>  
> +/*
> + * 3 plane non-subsampled (444) YCbCr
> + * 10 bpc, 30 bits per sample image data in a single contiguous buffer.
> + * index 0: Y plane,  [31:0] x:Y2:Y1:Y0    [2:10:10:10] little endian
> + * index 1: Cb plane, [31:0] x:Cb2:Cb1:Cb0 [2:10:10:10] little endian
> + * index 2: Cr plane, [31:0] x:Cr2:Cr1:Cr0 [2:10:10:10] little endian
> + */
> +#define DRM_FORMAT_X403		fourcc_code('X', '4', '0', '3')
> +
>  /*
>   * 3 plane YCbCr LSB aligned
>   * In order to use these formats in a similar fashion to MSB aligned ones
> 

-- 
Regards,

Laurent Pinchart