[RFC v2 4/7] ASoC: dmaengine_pcm: add copy support

[Mark Brown]

On Wed, Feb 15, 2017 at 04:46:44PM +0100, Arnaud Pouliquen wrote:
> On 02/15/2017 03:53 PM, Mark Brown wrote:
> > On Wed, Feb 15, 2017 at 02:59:18PM +0100, Arnaud Pouliquen wrote:

> > No, copy() is an alternative to doing DMA rather than something
> > that works with DMA.  If you want to have some sort of post
> > processing operation it shoudn't be called copy().  It's probably
> > worth considering just making a new format and letting userspace
> > convert things here.

> You mean using a plug-in alsa to do it? this seems not possible with
> tiny-alsa...
> Without a plug-in, driver will not be compatible with standard audio
> application.

Right.  But if you're using tinyalsa you've got some open coded system
specific stuff anyway!

> Do you think this would be reasonable if i implement something similar
> in my driver, without using the soc generic DMA engine?

Probably.  It might even be possible to fit it elegently into the
generic dmaengine code, just don't say it's a copy() operation since
that's a specific thing in ALSA.
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