linux-kernel - Re: [PATCH] MAINTAINERS: Add Helge as fbdev maintainer

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Message-ID: <vUIPai73T-nuC9ppTs9iaxFwCLWyB3ip7A3zfbhJTyYBqlqJLbOU217hKMAjZNrSnSdeKJa_3cnsr3S7vsK1QuxH22ESAGN-iZXF0DigALU=@emersion.fr>
Date:   Tue, 18 Jan 2022 14:39:14 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Helge Deller <deller@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Sven Schnelle <svens@...ckframe.org>
Subject: Re: [PATCH] MAINTAINERS: Add Helge as fbdev maintainer

On Tuesday, January 18th, 2022 at 15:23, Thomas Zimmermann <tzimmermann@...e.de> wrote:

> Am 18.01.22 um 09:10 schrieb Geert Uytterhoeven:
> > Hi Gerd,
> >
> > On Tue, Jan 18, 2022 at 7:30 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
> >> Also note that using a shadow framebuffer allows to decouple fbcon
> >> updates and scanout framebuffer updates.  Can be used to speed up
> >> things without depending on the 2d blitter.
> >
> > Assuming accesses to the shadow frame buffer are faster than accesses
> > to the scanout frame buffer. While this is true on modern hardware,
> > this is not the case on all hardware.  Especially if the shadow frame
> > buffer has a higher depth (XRGB8888) than the scanout frame buffer
> > (e.g. Cn)...
> >
> > The funny thing is that the systems we are interested in, once used
> > to be known for their graphics capabilities and/or performance...
>
> What I still don't understand: why are you so keen on maintaining an
> interface that only serves the console? Nothing else uses fbdev these
> days. Why not improve DRM/userspace to the point where it fits your
> requirements? Long-term, the latter would make a lot more sense.

+1

If you need any help with adapting user-space, feel free to ping me. I'd be
interested in discussing, providing feedback and potentially user-space
patches.