linux-kernel - Re: [PATCH 1/2] fbdev/offb: Update expected device name

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Message-ID: <20230615132107.GA9196@kitsune.suse.cz>
Date:   Thu, 15 Jun 2023 15:21:07 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Salvatore Bonaccorso <carnil@...ian.org>,
        Cyril Brulebois <cyril@...amax.com>,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] fbdev/offb: Update expected device name

Hello,

On Thu, Jun 15, 2023 at 03:06:28PM +0200, Thomas Zimmermann wrote:
> Hi
> 
> Am 15.06.23 um 15:03 schrieb Linux regression tracking (Thorsten Leemhuis):
> > On 16.04.23 14:34, Salvatore Bonaccorso wrote:
> > > 
> > > On Wed, Apr 12, 2023 at 11:55:08AM +0200, Cyril Brulebois wrote:
> > > > Since commit 241d2fb56a18 ("of: Make OF framebuffer device names unique"),
> > > > as spotted by Frédéric Bonnard, the historical "of-display" device is
> > > > gone: the updated logic creates "of-display.0" instead, then as many
> > > > "of-display.N" as required.
> > > > 
> > > > This means that offb no longer finds the expected device, which prevents
> > > > the Debian Installer from setting up its interface, at least on ppc64el.
> > > > 
> > > > It might be better to iterate on all possible nodes, but updating the
> > > > hardcoded device from "of-display" to "of-display.0" is confirmed to fix
> > > > the Debian Installer at the very least.

At the time this was proposed it was said that "of-display", is wrong,
and that "of-display.0" must be used for the first device instead, and
if something breaks an alias can be provided.

So how does one provide an alias so that offb can find "of-display.0" as
"of-display"?

Thanks

Michal

> > > [...]
> > > #regzbot ^introduced 241d2fb56a18
> > > #regzbot title: Open Firmware framebuffer cannot find of-display
> > > #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=217328
> > > #regzbot link: https://lore.kernel.org/all/20230412095509.2196162-1-cyril@debamax.com/T/#m34493480243a2cad2ae359abfd9db5e755f41add
> > > #regzbot link: https://bugs.debian.org/1033058
> > 
> > No reply to my status inquiry[1] a few weeks ago, so I have to assume
> > nobody cares anymore. If somebody still cares, holler!
> 
> I'd take a look if anyone can point me to an example of Geert's proposal.
> 
> Best regards
> Thomas
> 
> > 
> > #regzbot inconclusive: no answer to a status inquiry
> > #regzbot ignore-activity
> > 
> > [1]
> > https://lore.kernel.org/lkml/d1aee7d3-05f6-0920-b8e1-4ed5cf3f9f70@leemhuis.info/
> > 
> > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> > --
> > Everything you wanna know about Linux kernel regression tracking:
> > https://linux-regtracking.leemhuis.info/about/#tldr
> > If I did something stupid, please tell me, as explained on that page.
> 
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)