linux-kernel - Re: [PATCH v6 3/6] drm: Add driver for Solomon SSD130x OLED displays

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Message-ID: <bbb4f088-e6f8-52b6-c673-6e30583cbe57@redhat.com>
Date:   Wed, 9 Mar 2022 14:43:14 +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>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sam Ravnborg <sam@...nborg.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Maxime Ripard <maxime@...no.tech>,
        Noralf Trønnes <noralf@...nnes.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Lee Jones <lee.jones@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Linux PWM List <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH v6 3/6] drm: Add driver for Solomon SSD130x OLED displays

Hello Geert,

On 3/9/22 13:56, Geert Uytterhoeven wrote:
> Hi Javier,
> 
> On Wed, Mar 9, 2022 at 1:14 PM Javier Martinez Canillas
> <javierm@...hat.com> wrote:
>> On 3/8/22 17:30, Geert Uytterhoeven wrote:
>>> Unfortunately a regression was introduced since your v3: printed
>>> text is mirrored upside-down. I.e. "E" is rendered correctly, but "L"
>>> turns into "Γ" (Greek Gamma).
>>> I suspect something went wrong with the display initialization
>>> sequence.
>>>
>>
>> Could you please try Chen-Yu's fix for the COM scan direction mask ?
>>
>> https://lists.freedesktop.org/archives/dri-devel/2022-March/345915.html
>>
>> I made a mistake when converting to use the GENMASK() and FIELD_PREP()
>> macros in v4 as suggested by Andy. The SSD130X_SET_COM_SCAN_DIR_MASK
>> wasn't correct which would explain the output to be vertically flipped.
> 
> Thanks, confirmed fixed.
> 

Great, thanks a lot for testing and the confirmation!

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat