Messages in this thread | | | Date | Thu, 28 Jun 2012 14:30:26 +0200 | From | Lars-Peter Clausen <> | Subject | Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for pcm_mmap |
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On 06/28/2012 02:18 PM, Mark Brown wrote: > On Thu, Jun 28, 2012 at 02:15:38PM +0200, Takashi Iwai wrote: >> Lars-Peter Clausen wrote: > >>> to the ALSA core. Now that there is a generic dma_mmap_writecombine it may >>> make sense to integrate this with snd_pcm_lib_default_mmap. > >> Agreed. > >> Also, it must be portable. So far, only ARM has >> dma_mmap_writecombine(), thus the build on other arch would fail as >> is. > > Oh, dear - this means we don't actually have a generic API at all. Is > there any effort being made to make this generally available?
Yes there is, and in fact in next/master there is generic dma_mmap_writecombine. I'm not quite sure how it behaves on non ARM archs though. But in theory it should fallback to a normal coherent mapping. Marek did a lot of work on this, I've put him on Cc.
- Lars
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