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

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Date:   Wed, 22 Feb 2023 10:14:02 +0200
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Dmitry Osipenko <digetx@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH v1 09/10] staging: dsp: add support for Fortemedia FM34NE DSP

ср, 22 лют. 2023 р. о 00:41 Mark Brown <broonie@...nel.org> 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
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.
In the current state the driver sets up DSP and sets in constant bypass mode.

> for a moderately complex example of an analogue only device
> (which this appears to be in terms of system integration).