ALSA fixes for non-coherent ppc32 again

[Gerhard Pircher]

-------- Original-Nachricht --------
> Datum: Wed, 08 Jul 2009 16:13:10 +0200
> Von: Takashi Iwai <tiwai at suse.de>
> An: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> CC: Gerhard Pircher <gerhard_pircher at gmx.net>, linuxppc-dev at ozlabs.org
> Betreff: Re: ALSA fixes for non-coherent ppc32 again

> At Wed, 08 Jul 2009 13:01:50 +1000,
> Benjamin Herrenschmidt wrote:
> > 
> > On Mon, 2009-06-22 at 08:34 +1000, Benjamin Herrenschmidt wrote:
> > > On Sun, 2009-06-21 at 20:18 +0200, Gerhard Pircher wrote:
> > > > Hi,
> > > > 
> > > > Takashi Iwai posted patches to make ALSA work on non-coherent
> > > > PPC32 systems (almost exactly) a year ago. See here:
> > > >
> > > > http://www.nabble.com/-PATCH-0-3--ALSA-fixes-for-non-coherent-ppc32-to17980027.html#a17980027
> > > > 
> > > > As far as I can see these patches never went upstream. Where
> > > > there any objections or did we just forget about them? It would
> > > > be cool, if the patches could be merged now, as at least two
> > > > platforms need this bugfix (namely Sam440 and AmigaOne).
> > > 
> > > I definitely forgot about those... But I'm fine with what Takashi
> > > did for now, I can always make the powerpc helper for
> > > dma_mmap_coherent() smarter later on if necessary.
> > 
> > BTW. Can you guys send a "final" patch for adding mmap_coherent to
> > powerpc ? Please make so that the dma_mmap_coherent() function doesn't
> > explose if dma_ops->mmap_coherent is NULL though (either fail
> > gracefully or fallback to some standard mmap).
> 
> The attached is the revised patch.  It falls backs to the standard
> mmap.
> 
> The whole patch series are found in test/dma-fix branch of sound git
> tree below:
>   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
> test/dma-fix
> 
> I had no time to play cross-build yet, so it'd be helpful if someone
> can test it...
> (BTW, any good minimal gcc and binutils package for kernel builds for
>  PPC32?)
Okay, I cross-build it on a x86 machine and tested it on my AmigaOne with
the VIA686 onboard sound and a Soundblaster 5.1. It worked fine after I
applied the "ALSA: Fix SG-buffer DMA with non-coherent architectures"
patch.

Thanks!

Gerhard

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