linux-kernel - Re: [PATCH v3 0/7] drm: Add driver for Solomon SSD130X OLED displays

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Date:   Thu, 10 Feb 2022 18:55:47 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Noralf Trønnes <noralf@...nnes.org>,
        Maxime Ripard <maxime@...no.tech>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        DRI Development <dri-devel@...ts.freedesktop.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>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux PWM List <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH v3 0/7] drm: Add driver for Solomon SSD130X OLED displays

Hello Geert,

On 2/10/22 18:06, Geert Uytterhoeven wrote:
> On Wed, Feb 9, 2022 at 1:19 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> On Wed, Feb 9, 2022 at 10:03 AM 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.
>>
>> [...]
> 
>> The logo is not shown, even when I create a 16-color or 224-color
>> version of the small monochrome logo I'm using.
> 
> My mistake, I messed up the hook-up, causing it to pick a different
> logo that was too large to be displayed.
>

Great, thanks for all the testing.
 
> Of course it's using the 224-color logo reduced to monochrome instead
> of the real monochrome logo, as fbcon thinks it's running on XRGB8888.
>

Right. Once the patch lands, I'll look at wiring up the needed support in
DRM for the drivers to be able to advertise 8-bit grayscale and monochrome
to avoid the unnecessary conversions and to have feature parity with fbdev.

But I just wanted to do it incrementally and first port to DRM as first step.
 
Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat