[alsa-devel] ALSA on MIPS platform
ralf at linux-mips.org
Wed Aug 8 13:58:52 CEST 2007
On Tue, Aug 07, 2007 at 08:41:10PM +0200, Takashi Iwai wrote:
> > It's ALSA that is doing funny things here so there is no point in fixing
> > the arch code to work for ALSA.
> Yep, but OTOH, the arch code doesn't provide a proper standard way to
> mmap the pages allocated via dma_alloc_coherent(). That's the missing
> piece, especially on mips and sparc. ARM has already one.
> My wish is implementing dma_mmap_coherent() on all architectures, so
> that the driver can use it safely without messy ifdefs.
Adding dma_mmap_coherent has been proposed in 2004 but the discussion for
some reason went nowhere because it apparently isn't implementable on
PARISC due to cache synonyms - on MIPS we'd solve those issues where they
exist by using uncached or writethrough mappings, as apropriate.
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