Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20230412095509.2196162-1-cyril@debamax.com> <20230412095509.2196162-3-cyril@debamax.com>
In-Reply-To: <20230412095509.2196162-3-cyril@debamax.com>
From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Mon, 24 Apr 2023 09:33:32 +0200
Message-ID: <CAMuHMdW4rZn4p=gQZRWQQSEbQPmzZUd5eN+kP_Yr7bLgTHyvig@mail.gmail.com>
Subject: Re: [PATCH 2/2] drm/ofdrm: Update expected device name
To:     Cyril Brulebois <cyril@debamax.com>
Cc:     linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Rob Herring <robh@kernel.org>,
        Michal Suchanek <msuchanek@suse.de>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8BIT
Precedence: bulk

Hi Cyril,

CC DT

On Wed, Apr 12, 2023 at 12:05 PM Cyril Brulebois <cyril@debamax.com> 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@vger.kernel.org # v6.2+
> Signed-off-by: Cyril Brulebois <cyril@debamax.com>

Thanks for your patch, which is now commit 3a9d8ea2539ebebd
("drm/ofdrm: Update expected device name") in fbdev/for-next.

> --- 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,

Same comment as for "[PATCH 1/2] fbdev/offb: Update expected device
name".

https://lore.kernel.org/r/CAMuHMdVGEeAsmb4tAuuqqGJ-4+BBETwEwYJA+M9NyJv0BJ_hNg@mail.gmail.com

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds