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

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Message-ID: <ZDvrY7X9mpJ7WZ3z@eldamar.lan>
Date:   Sun, 16 Apr 2023 14:34:43 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Cyril Brulebois <cyril@...amax.com>, regressions@...ts.linux.dev
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>,
        Michal Suchanek <msuchanek@...e.de>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] fbdev/offb: Update expected device name

Hi

looping in as well the regressions list (hoping not doing any mistake
with the regzbot commands):

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.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217328
> Link: https://bugs.debian.org/1033058
> Fixes: 241d2fb56a18 ("of: Make OF framebuffer device names unique")
> Cc: stable@...r.kernel.org
> Signed-off-by: Cyril Brulebois <cyril@...amax.com>
> ---
>  drivers/video/fbdev/offb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/offb.c b/drivers/video/fbdev/offb.c
> index b97d251d894b..6264c7184457 100644
> --- a/drivers/video/fbdev/offb.c
> +++ b/drivers/video/fbdev/offb.c
> @@ -698,7 +698,7 @@ MODULE_DEVICE_TABLE(of, offb_of_match_display);
>  
>  static struct platform_driver offb_driver_display = {
>  	.driver = {
> -		.name = "of-display",
> +		.name = "of-display.0",
>  		.of_match_table = offb_of_match_display,
>  	},
>  	.probe = offb_probe_display,

#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

Regards,
Salvatore