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Groups > linux.kernel > #1232709 > unrolled thread
| Started by | Kamil Lulko <kamil.lulko@gmail.com> |
|---|---|
| First post | 2015-09-25 12:50 +0200 |
| Last post | 2015-09-26 11:10 +0200 |
| Articles | 4 — 4 participants |
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Re: No more new fbdev drivers, please Kamil Lulko <kamil.lulko@gmail.com> - 2015-09-25 12:50 +0200
Re: No more new fbdev drivers, please Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-09-25 15:10 +0200
Re: No more new fbdev drivers, please Daniel Vetter <daniel@ffwll.ch> - 2015-09-25 20:50 +0200
Re: No more new fbdev drivers, please Geert Uytterhoeven <geert@linux-m68k.org> - 2015-09-26 11:10 +0200
| From | Kamil Lulko <kamil.lulko@gmail.com> |
|---|---|
| Date | 2015-09-25 12:50 +0200 |
| Subject | Re: No more new fbdev drivers, please |
| Message-ID | <qcyJI-7lE-9@gated-at.bofh.it> |
Hi, > fbdev is (more or less) maintained, but it's a deprecated framework. All > new Linux display drivers should be done on DRM. What about no-mmu platforms? DRM has a big fat MMU dependency in the kconfig, is there a way to write DRM driver for such devices? /Kamil -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Tomi Valkeinen <tomi.valkeinen@ti.com> |
|---|---|
| Date | 2015-09-25 15:10 +0200 |
| Message-ID | <qcAVc-2gw-9@gated-at.bofh.it> |
| In reply to | #1232709 |
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On 25/09/15 13:41, Kamil Lulko wrote: > Hi, > >> fbdev is (more or less) maintained, but it's a deprecated framework. All >> new Linux display drivers should be done on DRM. > > What about no-mmu platforms? DRM has a big fat MMU dependency in the > kconfig, is there a way to write DRM driver for such devices? I guess not. Then again, I don't see why DRM would have a hard dependency to MMU, if the work is done to make DRM work optionally without MMU. How much work that is, I have no idea. Tom
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| From | Daniel Vetter <daniel@ffwll.ch> |
|---|---|
| Date | 2015-09-25 20:50 +0200 |
| Message-ID | <qcGed-1ip-5@gated-at.bofh.it> |
| In reply to | #1232782 |
On Fri, Sep 25, 2015 at 04:09:46PM +0300, Tomi Valkeinen wrote: > > > On 25/09/15 13:41, Kamil Lulko wrote: > > Hi, > > > >> fbdev is (more or less) maintained, but it's a deprecated framework. All > >> new Linux display drivers should be done on DRM. > > > > What about no-mmu platforms? DRM has a big fat MMU dependency in the > > kconfig, is there a way to write DRM driver for such devices? > > I guess not. > > Then again, I don't see why DRM would have a hard dependency to MMU, if > the work is done to make DRM work optionally without MMU. How much work > that is, I have no idea. We have plenty drivers in drm without hw mmu, and yeah there's probably no reason at all why the drm subsystem has a hard depency on cpu MMUs. Might be some #ifdef fallout that needs to be done, but there shouldn't be anything fundamental. Maybe the old dri1 days code has something, but that's all historical cruft anyway. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| Date | 2015-09-26 11:10 +0200 |
| Message-ID | <qcTEu-3SO-13@gated-at.bofh.it> |
| In reply to | #1232709 |
On Fri, Sep 25, 2015 at 12:41 PM, Kamil Lulko <kamil.lulko@gmail.com> wrote:
>> fbdev is (more or less) maintained, but it's a deprecated framework. All
>> new Linux display drivers should be done on DRM.
>
>
> What about no-mmu platforms? DRM has a big fat MMU dependency in the
> kconfig, is there a way to write DRM driver for such devices?
That would indeed be a showstopper...
I dropped the dependency, and gave it a quick try for m68knommu.
Seems like DRM currently needs pgprot_writecombine() and pte_wrprotect().
Probably that can be fixed easily.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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