linux-kernel - Re: [PATCH 2/3] fbdev: ssd1307fb: Change "solomon,page-offset" property default value

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Date:   Fri, 17 Nov 2023 23:18:45 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Sahaj Sarup <sahaj.sarup@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Helge Deller <deller@....de>, Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 2/3] fbdev: ssd1307fb: Change "solomon,page-offset"
 property default value

Andy Shevchenko <andriy.shevchenko@...ux.intel.com> writes:

Hello Andy,

> On Thu, Nov 16, 2023 at 07:07:38PM +0100, Javier Martinez Canillas wrote:
>> This is used to specify the page start address offset of the display RAM.
>> 
>> The value is used as offset when setting the page start address with the
>> SSD130X_SET_PAGE_RANGE command, and the driver currently sets its value to
>> 1 if the property is not present in the Device Tree.
>> 
>> But the datasheet mentions that the value on reset for the page start is a
>> 0, so it makes more sense to also have 0 as the default value for the page
>> offset if the property is not present.
>> 
>> In fact, using a default value of 1 leads to the display not working when
>> the fbdev is attached to the framebuffer console.
>> 
>> Reported-by: Sahaj Sarup <sahaj.sarup@...aro.org>
>
> Closes?

There's no report in a mailing list or bug tracker to reference.

> Fixes?
>

Since the default has been the same since the driver was merged,
it doesn't make that much sense for me to reference that commit.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat