linux-kernel - Re: [PATCH v7 04/11] drm/fourcc: Add DRM_FORMAT_Y10

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Message-ID: <20260128120218.GG2558360@killaraus>
Date: Wed, 28 Jan 2026 14:02:18 +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>,
	Pekka Paalanen <pekka.paalanen@...labora.com>
Subject: Re: [PATCH v7 04/11] drm/fourcc: Add DRM_FORMAT_Y10_P32

On Mon, Dec 01, 2025 at 02:18:46PM +0200, Tomi Valkeinen wrote:
> Add Y10_P32, a 10 bit greyscale format, with 3 pixels packed into
> 32-bit container.
> 
> The fourcc for the format is 'YPA4', which comes from Y - Y only, P -
> packed, A - 10 (as in 0xA), 4 - 4 bytes.
> 
> Reviewed-by: Vishal Sagar <vishal.sagar@....com>
> Reviewed-by: Pekka Paalanen <pekka.paalanen@...labora.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 | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index a39b9d7a5b62..0d222f6c1a30 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -388,6 +388,9 @@ const struct drm_format_info *__drm_format_info(u32 format)
>  		{ .format = DRM_FORMAT_XV20,		.depth = 0,  .num_planes = 2,
>  		  .char_per_block = { 4, 8, 0 }, .block_w = { 3, 3, 0 }, .block_h = { 1, 1, 0 },
>  		  .hsub = 2, .vsub = 1, .is_yuv = true },
> +		{ .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 },
>  	};
>  
>  	unsigned int i;
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 5cfc188c4e72..0fd99ae32a06 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -469,6 +469,7 @@ extern "C" {
>   */
>  
>  #define DRM_FORMAT_Y8		fourcc_code('G', 'R', 'E', 'Y')  /* 8-bit Y-only */
> +#define DRM_FORMAT_Y10_P32	fourcc_code('Y', 'P', 'A', '4')  /* [31:0] x:Y2:Y1:Y0 2:10:10:10 little endian */
>  
>  /*
>   * Format Modifiers:

-- 
Regards,

Laurent Pinchart