linux-kernel - Re: [PATCH v4 03/11] drm/fourcc: Add DRM_FORMAT

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Message-ID: <CAMuHMdXM1B1c=62EpcuUdpdpaBRZSJLXb1GBB0egzp7Fyeo5-w@mail.gmail.com>
Date: Wed, 26 Mar 2025 14:52:12 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
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>, 
	Laurent Pinchart <laurent.pinchart@...asonboard.com>, Michal Simek <michal.simek@....com>, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v4 03/11] drm/fourcc: Add DRM_FORMAT_Y8

Hi Tomi,

On Wed, 26 Mar 2025 at 14:23, Tomi Valkeinen
<tomi.valkeinen@...asonboard.com> wrote:
> Add greyscale Y8 format.
>
> Acked-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Thanks for your patch!

> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -405,6 +405,9 @@ extern "C" {
>  #define DRM_FORMAT_YUV444      fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */
>  #define DRM_FORMAT_YVU444      fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */
>
> +/* Greyscale formats */
> +
> +#define DRM_FORMAT_Y8          fourcc_code('G', 'R', 'E', 'Y')  /* 8-bit Y-only */

This format differs from e.g. DRM_FORMAT_R8, which encodes
the number of bits in the FOURCC format. What do you envision
for e.g. DRM_FORMAT_Y16? fourcc_code('G', 'R', '1', '6')?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds