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:   Tue, 13 Jul 2021 18:59:51 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        Russell King <linux@...linux.org.uk>,
        linux-efi@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Hans de Goede <hdegoede@...hat.com>, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org, Borislav Petkov <bp@...e.de>,
        Albert Ou <aou@...s.berkeley.edu>,
        Peter Robinson <pbrobinson@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Atish Patra <atish.patra@....com>
Subject: Re: [PATCH v3 0/2] allow simple{fb,drm} drivers to be used on non-x86
 EFI platforms

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.

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering