linux-kernel - Re: [PATCH v3 0/2] allow simple{fb, drm} drivers to be used on non-x86 EFI platforms

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Date:   Mon, 19 Jul 2021 09:10:52 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Dave Airlie <airlied@...il.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Catalin Marinas <catalin.marinas@....com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Atish Patra <atish.patra@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Robinson <pbrobinson@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Borislav Petkov <bp@...e.de>, Will Deacon <will@...nel.org>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v3 0/2] allow simple{fb, drm} drivers to be used on
 non-x86 EFI platforms

On Mon, 19 Jul 2021 at 04:59, Dave Airlie <airlied@...il.com> wrote:
>
> On Thu, 15 Jul 2021 at 18:11, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> >
> > Hi
> >
> > Am 13.07.21 um 18:59 schrieb Javier Martinez Canillas:
> > > On 6/25/21 3:09 PM, Javier Martinez Canillas wrote:
> > >> The simplefb and simpledrm drivers match against a "simple-framebuffer"
> > >> device, but for aarch64 this is only registered when using Device Trees
> > >> and there's a node with a "simple-framebuffer" compatible string.
> > >>
> > >> There is no code to register a "simple-framebuffer" platform device when
> > >> using EFI instead. In fact, the only platform device that's registered in
> > >> this case is an "efi-framebuffer", which means that the efifb driver is
> > >> the only driver supported to have an early console with EFI on aarch64.
> > >>
> > >> The x86 architecture platform has a Generic System Framebuffers (sysfb)
> > >> support, that register a system frambuffer platform device. It either
> > >> registers a "simple-framebuffer" for the simple{fb,drm} drivers or legacy
> > >> VGA/EFI FB devices for the vgafb/efifb drivers.
> > >>
> > >> The sysfb is generic enough to be reused by other architectures and can be
> > >> moved out of the arch/x86 directory to drivers/firmware, allowing the EFI
> > >> logic used by non-x86 architectures to be folded into sysfb as well.
> > >>
> > >
> > > Any more comments on this series? It would be nice for this to land so the
> > > simpledrm driver could be used on aarch64 EFI systems as well.
> > >
> > > The patches have already been acked by x86 and DRM folks.
> >
> > Time to get this merged, I'd say. People are asking for these patches
> > already.
>
> Can we just merge via drm-misc and make sure the acks are present and
> I'll deal with the fallout if any.
>

Fine with me. Could you stick it on a separate branch so I can double
check whether there are any issues wrt the EFI tree?

Thanks,
Ard.