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Re: No more new fbdev drivers, please

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Den 27.09.2015 18:08, skrev Emil Velikov:
> Hi all,
>
> On 27 September 2015 at 14:09, Noralf Trønnes <noralf@tronnes.org> wrote:
>> Den 24.09.2015 14:27, skrev Tomi Valkeinen:
>>> Hi all,
>>>
>>> fbdev is (more or less) maintained, but it's a deprecated framework. All
>>> new Linux display drivers should be done on DRM.
>>>
>>> So let's not add any more new fbdev drivers.
>>>
>>> I will continue to maintain the current fbdev drivers, and I don't mind
>>> adding some new features to those current drivers, as long as the amount
>>> of code required to add the features stays sensible.
>>>
>>> I see we have three fbdev drivers in staging: xgifb, fbtft and sm750fb,
>>> and the question is what to do with those.
>>>
>>> xgifb was added in 2010, and is still in staging.
>>>
>>> fbtft looks like maybe some kind of framework on top of fbdev, with
>>> fbtft specific subdrivers... I didn't look at it in detail, but my gut
>>> says "never".
>>
>> I have done some work [1] to try and make fbtft look more like the rest
>> of the kernel (doc [2]), but that work will result in an almost complete
>> rewrite of fbtft.
>  From a very quick skim fbtft looks pretty much like drm/panel. We
> presently have 30+ 'simple' dsi panels, plus a bunch of spi ones. Have
> you had a look at these ?

Thanks, that was useful.
I can use drm_panel to setup the controller (prepare) and do backlight
(enable/disable), but I need a way to send framebuffer changes.
I could do this:

struct tinydrm_panel_funcs {
         int (*update)(struct drm_framebuffer *fb,
                       struct drm_gem_cma_object *cma_obj,
                       unsigned flags, unsigned color,
                       struct drm_clip_rect *clips, unsigned num_clips);
};

struct tinydrm_panel {
         struct drm_panel panel;
         u32 width;
         u32 height;
         void *dev_private;

         const struct tinydrm_panel_funcs *funcs;
};

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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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