linux-kernel - Re: [PATCH 2/2] drm/ofdrm: Update expected device name

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Date:   Mon, 10 Jul 2023 18:36:41 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Cyril Brulebois <cyril@...amax.com>
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/ofdrm: Update expected device name

On Wed, Apr 12, 2023 at 11:55:09AM +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.
> 
> Given the code similarity it is likely to affect ofdrm in the same way.
> 
> It might be better to iterate on all possible nodes, but updating the
> hardcoded device from "of-display" to "of-display.0" is likely to help
> as a first step.
> 
> 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 # v6.2+
> Signed-off-by: Cyril Brulebois <cyril@...amax.com>
Reviewed-by: Michal Suchánek <msuchanek@...e.de>
> ---
>  drivers/gpu/drm/tiny/ofdrm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
> index 6e349ca42485..92df021d71df 100644
> --- a/drivers/gpu/drm/tiny/ofdrm.c
> +++ b/drivers/gpu/drm/tiny/ofdrm.c
> @@ -1390,7 +1390,7 @@ MODULE_DEVICE_TABLE(of, ofdrm_of_match_display);
>  
>  static struct platform_driver ofdrm_platform_driver = {
>  	.driver = {
> -		.name = "of-display",
> +		.name = "of-display.0",
>  		.of_match_table = ofdrm_of_match_display,
>  	},
>  	.probe = ofdrm_probe,
> -- 
> 2.30.2
>