linux-kernel - Re: [PATCH v3 00/10] drm: Add support for low-color frame buffer formats

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Message-ID: <YsmE1D8lGp4XKs99@ravnborg.org>
Date:   Sat, 9 Jul 2022 15:38:28 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/10] drm: Add support for low-color frame buffer
 formats

Hi Geert,

On Fri, Jul 08, 2022 at 08:20:45PM +0200, Geert Uytterhoeven wrote:
> 	Hi all,
> 
> A long outstanding issue with the DRM subsystem has been the lack of
> support for low-color displays, as used typically on older desktop
> systems, and on small embedded displays.

IT is super to have this addressed - thanks!

> 
> This patch series adds support for color-indexed frame buffer formats
> with 2, 4, and 16 colors.  It has been tested on ARAnyM using a
> work-in-progress Atari DRM driver supporting 2, 4, 16, 256, and 65536
> colors, with text console operation, fbtest, and modetest.
> 
> Overview:
>   - Patch 1 introduces a helper, to be used by later patches in the
>     series,
>   - Patch 2 introduces a flag to indicate color-indexed formats,
>   - Patches 3 and 4 correct calculations of bits per pixel for sub-byte
>     pixel formats,
>   - Patches 5 and 6 introduce the new C[124] formats,
>   - Patch 7 fixes an untested code path,
>   - Patch 8 documents the use of "red" for light-on-dark displays,
>   - Patches 9 and 10 add more fourcc codes for light-on-dark and
>     dark-on-light frame buffer formats, which may be useful for e.g. the
>     ssd130x and repaper drivers.

Applied all patches to drm-misc (drm-misc-next), including the last two
RFC patches as we then have the formats ready when a user pops up.

	Sam