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