Re: Re: RFC: dma_mmap_coherent() for powerpc/ppc architecture and ALSA?

-------- Original-Nachricht --------
Datum: Mon, 12 Jun 2006 12:51:16 +0200
Von: Takashi Iwai [off-list ref]
An: Gerhard Pircher [off-list ref]
Betreff: Re: RFC: dma_mmap_coherent() for powerpc/ppc architecture and
ALSA?

quoted

Well, implementing the dma_mmap_coherent() function isn't the
problem, because it is already implemented for the ARM
architecture.

Actually, I wrote dma_coherent_mmap patch long time ago but it has
been left forgotten.  The patch attached below seems applicable to
2.6.17 tree, but I'm not sure whether it still works properly.
It's untested on most of architectures.

Thanks, that helps me a lot!

quoted

But as far as I understand this would require a rewrite of all the
ALSA drivers (or at least a rewrite of the ALSA's DMA helper
functions).

Yes.  The change of ALSA side has been also on my tree.  But it was
still pending since I'm not satisfied with the design yet.
If you're interested in it, let me know.  I'll post the patch.

Yes, please! Then I can test, if the dma_mmap_coherent() patch works on
my non cache coherent powerpc machine. Do you think the DMA Layer/ALSA patches will go upstream in one of the next ALSA/Linux kernel versions?

Thanks!

Gerhard

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