Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko

From	Sebastian Frias <sf84@laposte.net>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko
Date	2015-12-30 10:40 +0100
Message-ID	<qLloC-4Ol-3@gated-at.bofh.it> (permalink)
References	(1 earlier) <qL2P0-1d9-5@gated-at.bofh.it> <qL38l-1As-1@gated-at.bofh.it> <qL3i2-1DR-1@gated-at.bofh.it> <qL5MS-35d-23@gated-at.bofh.it> <qLjZv-42K-1@gated-at.bofh.it>
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Hi,

On 12/30/2015 09:06 AM, Tomi Valkeinen wrote:
>
> Also note that I don't want new fbdev drivers into the mainline kernel.
> You should implement a DRM based driver instead.
>

Thanks, is there a porting guide to go from fbdev to DRM?
Does DRM provides a "fbdev" backward compatible API? Would that be feasible?
I did not find much about that.

Currently our stack is something like:

    Qt -> eglfs -> Mali -> fbdev -> mem -> output
                   (HW)                     (HW)

We don't control the eglfs/Mali (GPU) part.
 From what I could see, Mali uses DRM with X11 which we do not need 
(note: I'm not a Mali expert and just took a quick look at the code so I 
may be wrong), which could be a problem.

If "implement a DRM driver" is a lot of work, it would end up as a 
business decision and probably would not happen.
Would you say there are good solid arguments to shake our current stack 
(other than for dusting it off)?

By the way, does DRM improves 2D acceleration support over fbdev?

Thanks,

Sebastian
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Thread

[RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Sebastian Frias <sf84@laposte.net> - 2015-12-29 14:20 +0100
  Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Frans Klaver <fransklaver@gmail.com> - 2015-12-29 14:50 +0100
    Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Sebastian Frias <sf84@laposte.net> - 2015-12-29 15:10 +0100
      Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Frans Klaver <fransklaver@gmail.com> - 2015-12-29 15:20 +0100
        Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Sebastian Frias <sf84@laposte.net> - 2015-12-29 18:00 +0100
          Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-12-30 09:10 +0100
            Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Sebastian Frias <sf84@laposte.net> - 2015-12-30 10:40 +0100
              Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-12-30 11:40 +0100

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