linux-kernel - Re: [PATCH 0/4] drm/tiny: Add driver for Solomon SSD1307 OLED displays

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Message-ID: <CAMuHMdXKZ=BkvVqdpiNPNJgxm9SzQ3Z0n4SqV2-4oPRveybd6g@mail.gmail.com>
Date:   Tue, 1 Feb 2022 09:26:59 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Simon Ser <contact@...rsion.fr>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Mark Brown <broonie@...nel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Maxime Ripard <maxime@...no.tech>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 0/4] drm/tiny: Add driver for Solomon SSD1307 OLED displays

On Mon, Jan 31, 2022 at 9:39 PM Simon Ser <contact@...rsion.fr> wrote:
> On Monday, January 31st, 2022 at 21:36, Simon Ser <contact@...rsion.fr> wrote:
>
> > This driver only advertises XRGB8888 in ssd1307_formats. It would be nice to
> > expose R8 as well so that user-space can directly produce suitable buffers.
> > It would also be nice to have some kind of preferred format, so that user-space
> > knows R8 is preferred over XRGB8888.
>
> Hm, since the format used by the hw is actually R1, adding that to drm_fourcc.h
> would be even better.

What's the story with the Rn formats?
The comments say "n bpp Red", while this is a monochrome (even
inverted) display?

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