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

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Date:   Mon, 11 Jul 2022 10:50:00 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Sam Ravnborg <sam@...nborg.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        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

Am 09.07.22 um 15:38 schrieb Sam Ravnborg:
> 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.

For the patchset

Acked-by: Thomas Zimemrmann <tzimmermann@...e.de>

> 
> 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.

I know it's v3 already, but give people at least a workday for reviewing 
before merging patches of this size and impact. Friday-evening patches 
are not supposed to be merged on Saturday afternoons.

Best regards
Thomas

> 
> 	Sam

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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