[alsa-devel] Managing resources of DSP from arm core side

[Daniel Baluta]

On Thu, Jan 30, 2020 at 2:03 PM Peter Ujfalusi <peter.ujfalusi at ti.com> wrote:
>
> Hi Daniel,
>
> On 28/01/2020 17.14, Daniel Baluta wrote:
> > Hi Peter,
> >
> > Liam mentioned that at some point (when working for OMAP)
> > you might have had the same challenge I'm facing now.
>
> Sorry for the delay...
>
> > I'm trying to figure out how to properly manage resources needed by
> > the IPs configured
> > by DSP.
> >
> > On i.MX8 we the following scenario:
> >
> > - Application processor (arm64) exposes an ALSA sound card to applications
> > - DSP (Hifi4) does the processing
> >
> > DSP has direct access to  DAI registers but it doesn't have (easily)
> > access to other resources
> > like: pinctrl, power-domain, clocks, etc.
> >
> > I was wondering how did you tackled this for OMAP?
>
> It is (was, as the AESS/ABE support is not upstream) bit different.
> From the audio backend we do not touch the DAI registers, all setup is
> done on the Linux side and the AESS 'only' managing the data flow.
>
> So the back-ends are the DAIs and they are managed by Linux, the
> front-end is AESS. DAIs are configured by fixing up the hw_params for
> them in the AESS (front-end) stack, so they are configured correctly for
> the use case.

I see. Thanks!