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

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Date:   Tue, 1 Feb 2022 09:43:49 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Maxime Ripard <maxime@...no.tech>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Noralf Trønnes <noralf@...nnes.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Linux PWM List <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH 0/4] drm/tiny: Add driver for Solomon SSD1307 OLED displays

Hi Javier,

On Mon, Jan 31, 2022 at 9:12 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> This patch series adds a DRM driver for the Solomon OLED SSD1305, SSD1306,
> SSD1307 and SSD1309 displays. It is a port of the ssd1307fb fbdev driver.

Thanks for your series!

I'll give it a try on an Adafruit FeatherWing 128x32 OLED, connected
to an OrangeCrab ECP5 FPGA board running a 64 MHz VexRiscv RISC-V
softcore.

> Using the DRM fb emulation, all the tests from Geert Uytterhoeven's fbtest
> (https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git) passes:
>
>      ./fbtest -f /dev/fb1
>     Using drawops cfb32 (32 bpp packed pixels)
>     Available visuals:
>       Monochrome
>       Grayscale 256
>       Truecolor 8:8:8:0

Oh, fake 32-bpp truecolor ;-)

Does it run modetest, too?

I'm trying to get modetest working on my atari DRM driver.
Comparing to the cirrus driver doesn't help much, as modetest doesn't
seem to work with the cirrus driver (modified to not do hardware
access, as I don't have cirrus hardware):

    # modetest -M cirrus -s 31:1024x768-60Hz
    setting mode 1024x768-60.00Hz on connectors 31, crtc 34
    failed to set gamma: Function not implemented

Does there exist another simple test program for showing something
using the DRM API?

Thanks!

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