Re: No more new fbdev drivers, please

From	Bernie Thompson <bernie@plugable.com>
Newsgroups	linux.kernel
Subject	Re: No more new fbdev drivers, please
Date	2015-09-28 23:00 +0200
Message-ID	<qdNGH-2fW-17@gated-at.bofh.it> (permalink)
References	(1 earlier) <qce8i-3ho-13@gated-at.bofh.it> <qcgD7-70f-3@gated-at.bofh.it> <qcT1M-2SP-1@gated-at.bofh.it> <qd18Z-6cT-1@gated-at.bofh.it> <qd254-7y5-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sat, Sep 26, 2015 at 11:01 AM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> The smallest of these (udl) still counts in at ca. 2800 LoC,

Note udlfb.c, the original fbdev driver that I helped write and that
the udl DRM driver was based on, is ~1800 LoC ... so we're actually
talking in the ballpark of 2x (rather than 10x) between fbdev and DRM
in this case. That said, the complexity difference is probably higher
than the LoC difference. I know I personally have struggled in the
shift from understanding fbdev to understanding DRM.

The fact that there's drivers of both types and USB hardware might
make udl may be a good driver to use as a base for any additional
simplification / helper work. David Airlie and David Herrmann both
have this hardware. David Airlie did the port from fbdev to DRM, so
he's made it an exemplary driver.  And if anyone needs any hardware
which works with udlfb and udl, we're happy to send free hardware to
any programmers who are willing to contribute in the form of code or
testing: http://plugable.com/projects/plugable-open-source-hardware-samples-program

More simplification and documentation would be great. In particular,
the optimization for the connector+encoder+crtc combination others
have mentioned seems like it would be worthwhile.

Cheers,
Bernie
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Thread

No more new fbdev drivers, please Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-09-24 14:30 +0200
  Re: No more new fbdev drivers, please Thomas Petazzoni <thomas.petazzoni@free-electrons.com> - 2015-09-24 14:50 +0200
    Re: No more new fbdev drivers, please Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-24 17:30 +0200
      Re: No more new fbdev drivers, please Alex Deucher <alexdeucher@gmail.com> - 2015-09-24 17:40 +0200
      Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-24 18:00 +0200
        Re: No more new fbdev drivers, please Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-24 18:20 +0200
        Re: No more new fbdev drivers, please Ondrej Zary <linux@rainbow-software.org> - 2015-09-24 19:20 +0200
          Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-24 20:10 +0200
    Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-24 17:30 +0200
      Re: No more new fbdev drivers, please Geert Uytterhoeven <geert@linux-m68k.org> - 2015-09-26 10:30 +0200
        Re: No more new fbdev drivers, please Alex Deucher <alexdeucher@gmail.com> - 2015-09-26 19:10 +0200
          Re: No more new fbdev drivers, please Geert Uytterhoeven <geert@linux-m68k.org> - 2015-09-26 20:10 +0200
            Re: No more new fbdev drivers, please David Herrmann <dh.herrmann@gmail.com> - 2015-09-26 20:20 +0200
              Re: No more new fbdev drivers, please Geert Uytterhoeven <geert@linux-m68k.org> - 2015-09-26 20:50 +0200
                Re: No more new fbdev drivers, please Rob Clark <robdclark@gmail.com> - 2015-09-26 22:50 +0200
                Re: No more new fbdev drivers, please Dave Airlie <airlied@gmail.com> - 2015-09-27 00:00 +0200
                Re: No more new fbdev drivers, please Emil Velikov <emil.l.velikov@gmail.com> - 2015-09-30 14:00 +0200
              Re: No more new fbdev drivers, please Gerd Hoffmann <kraxel@redhat.com> - 2015-09-28 09:50 +0200
                Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-28 14:40 +0200
                Re: No more new fbdev drivers, please Gerd Hoffmann <kraxel@redhat.com> - 2015-09-29 10:30 +0200
                Re: No more new fbdev drivers, please Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-09-29 10:40 +0200
            Re: No more new fbdev drivers, please Bernie Thompson <bernie@plugable.com> - 2015-09-28 23:00 +0200
            Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-29 09:10 +0200
  Re: No more new fbdev drivers, please Aaro Koskinen <aaro.koskinen@iki.fi> - 2015-09-25 11:00 +0200
    Re: No more new fbdev drivers, please Ondrej Zary <linux@rainbow-software.org> - 2015-09-25 13:10 +0200
  Re: No more new fbdev drivers, please Sudip Mukherjee <sudipm.mukherjee@gmail.com> - 2015-09-26 09:20 +0200
    Re: No more new fbdev drivers, please Ilia Mirkin <imirkin@alum.mit.edu> - 2015-09-26 09:40 +0200
  Re: No more new fbdev drivers, please Noralf Trønnes <noralf@tronnes.org> - 2015-09-27 15:20 +0200
    Re: No more new fbdev drivers, please Emil Velikov <emil.l.velikov@gmail.com> - 2015-09-27 18:10 +0200
      Re: No more new fbdev drivers, please Noralf Trønnes <noralf@tronnes.org> - 2015-09-29 01:00 +0200
        Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-29 09:10 +0200

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