linux-kernel - Re: [PATCH 0/2] Allow disabling all native fbdev drivers and only keeping DRM emulation

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Message-ID: <ZJ8UVHEWXu1Jrg+I@smile.fi.intel.com>
Date:   Fri, 30 Jun 2023 20:43:48 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, Helge Deller <deller@....de>,
        Ingo Molnar <mingo@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH 0/2] Allow disabling all native fbdev drivers and only
 keeping DRM emulation

On Fri, Jun 30, 2023 at 08:42:21PM +0300, Andy Shevchenko wrote:
> On Fri, Jun 30, 2023 at 07:38:01PM +0200, Javier Martinez Canillas wrote:
> > Andy Shevchenko <andriy.shevchenko@...ux.intel.com> writes:
> > > On Fri, Jun 30, 2023 at 12:51:02AM +0200, Javier Martinez Canillas wrote:

...

> > >> The reason for doing this is that now with simpledrm, there's no need for
> > >> the legacy fbdev (e.g: efifb or vesafb) drivers anymore and many distros
> > >
> > > How does simpledrm works with earlycon=efi?
> > >
> > 
> > simpledrm isn't for earlycon. For that you use a different driver (i.e:
> > drivers/firmware/efi/earlycon.c). I'm just talking about fbdev drivers
> > here that could be replaced by simpledrm.
> 
> So, efifb can't be replaced. Please, fix your cover letter to reduce false
> impression of the scope of usage of the simpledrm.

Or tell how it can be used for earlycon on EFI platforms (if it can be).

-- 
With Best Regards,
Andy Shevchenko