Re: [PATCH v1 09/10] staging: dsp: add support for Fortemedia FM34NE DSP

[Mark Brown]

On Wed, Feb 22, 2023 at 10:14:02AM +0200, Svyatoslav Ryhel wrote:
> ср, 22 лют. 2023 р. о 00:41 Mark Brown <broonie@xxxxxxxxxx> пише:
> >
> > On Tue, Feb 21, 2023 at 08:32:10PM +0200, Svyatoslav Ryhel wrote:
> > > FM34NE is digital sound processing chip used for active
> > > noise suppression mainly on ASUS Transformers.
> >
> > This looks like it should be fairly straightforward to support
> > within ASoC without too much work, and since it's in the audio
> > path it should probably be referenced from the sound card it'll
> > end up having an ABI impact on the card.  Take a look at wm9090
> 
> wm9090 is a sound codec, like rt5631 or wm8903 while fm34 is NOT a
> sound codec. It is sound processing device which must be active only

The WM9090 is not a CODEC, it is an analog amplifier with no digital
inputs or outputs.  That is exactly the same from a system integration
point of view, it takes an audio stream in and routes it to an output
with some processing.

> when DMIC is used. In all other cases it has to be bypassed. At the same time,
> it has to be set up because else there will be no sound on the actual device.

DAPM can sort all that out for you.

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