[alsa-devel] soc-dsp programming model for loopbacks

[Mark Brown]

On Wed, Jan 25, 2012 at 05:12:25PM +0000, Liam Girdwood wrote:
> On Tue, 2012-01-24 at 22:00 +0000, Mark Brown wrote:

> > Note that the use of soc-dsp isn't required for on-SoC DSPs - it really
> > depends on how the hardware looks.  If the DSP external format is very
> > strongly tied to the format used to DMA to and from main memory (or
> > other interfaces) then soc-dsp is what you need, if the DSP is able to
> > rewrite formats more flexibly then it should be more direct to model it
> > as a CODEC device with whatever number of DAIs and routing between them.

> It's also needed if your DSP cant control or configure any of your host
> CPU DAI hardware controllers that it needs to physically use to route
> audio data.

Depends how they're allocated - the DSP driver can always do the
management on behalf of the DSP firmware if the hardware is structured
in a way that makes that make sense (for example, if the CPU never talks
to the outside world directly).
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