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

Mark Brown broonie at opensource.wolfsonmicro.com
Thu Jan 26 15:03:10 CET 2012

On Thu, Jan 26, 2012 at 07:12:07AM -0600, Pierre-Louis Bossart wrote:

> Bear with me here, I am still somewhat confused.
> - Liam suggested either a hard-coded DAI configuration or machine
> driver logic to remove the need for virtual front-ends
> - Mark suggested to consider the DSP as a CODEC with some work to
> re-implement the host-dsp interface.
> Is this CODEC<->CODEC solution on top of the Dynamic PCM patches? Or
> are we talking about two completely different approaches?

The two are orthogonal to each other but complimenary.  Like I say it
really depends on how your hardware is wired up - it depends on the
level of isolation that the DSP provides between the CPU and the outside

If the system looks like:

    CPU <-> DSP <-> External

you should model the DSP as a separate device.  If on the other hand it
looks more like this:

   DSP     External

then soc-pcm is what you're looking for.
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