linux-kernel - Re: [PATCH 2/2] efi: earlycon: Add support for generic framebuffers and move to fbdev subsystem

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Message-ID: <CAHp75Vcu2C-+XyVtLrX8Awxb18uNx6_n3CCCVUyekL4yP755Xw@mail.gmail.com>
Date:   Sat, 30 Jul 2022 12:25:34 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Markuss Broks <markuss.broks@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Helge Deller <deller@....de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Wei Ming Chen <jj251510319013@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tony Lindgren <tony@...mide.com>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 2/2] efi: earlycon: Add support for generic framebuffers
 and move to fbdev subsystem

On Sat, Jul 30, 2022 at 10:55 AM Markuss Broks <markuss.broks@...il.com> wrote:
> On 7/29/22 00:19, Andy Shevchenko wrote:
> > On Thu, Jul 28, 2022 at 4:32 PM Markuss Broks <markuss.broks@...il.com> wrote:

...

> I suppose we could use something like:
>
> if (region_intersects() == REGION_INTERSECTS)

Yes.

...

> >> +       ret = sscanf(device->options, "%u,%u,%u", &info.x, &info.y, &info.depth);
> >> +       if (ret != 3)
> >> +               return -ENODEV;
> >
> > Don't we have some standard template of this, something like XxYxD,
> > where X, Y, and D are respective decimal numbers?
>
> I'm not aware of this.

I believe we won't introduce more chaos in already existing formats of
one or another thing, so I prefer to be stuck with in practice use
(e.g. "1024x768x16" without quotes for x=1024, y=768, depth=16).

-- 
With Best Regards,
Andy Shevchenko