linux-kernel - Re: [PATCH v1 1/1] ASoC: wm8903: implement DMIC support

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Date:   Mon, 27 Mar 2023 11:37:05 +0300
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Dmitry Osipenko <digetx@...il.com>,
        patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] ASoC: wm8903: implement DMIC support

пн, 27 бер. 2023 р. о 11:32 Charles Keepax <ckeepax@...nsource.cirrus.com> пише:
>
> On Sat, Mar 25, 2023 at 10:36:43AM +0200, Svyatoslav Ryhel wrote:
> > Add DMIC input and routing.
> >
> > Tested-by: Svyatoslav Ryhel <clamor95@...il.com> # ASUS TF300T
> > Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> > ---
> >  sound/soc/codecs/wm8903.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
> > index 41346e5ec5ad..9c2f0aadcff3 100644
> > --- a/sound/soc/codecs/wm8903.c
> > +++ b/sound/soc/codecs/wm8903.c
> > @@ -9,7 +9,6 @@
> >   *
> >   * TODO:
> >   *  - TDM mode configuration.
> > - *  - Digital microphone support.
> >   */
> >
> >  #include <linux/module.h>
> > @@ -816,6 +815,7 @@ SND_SOC_DAPM_INPUT("IN2L"),
> >  SND_SOC_DAPM_INPUT("IN2R"),
> >  SND_SOC_DAPM_INPUT("IN3L"),
> >  SND_SOC_DAPM_INPUT("IN3R"),
> > +SND_SOC_DAPM_INPUT("DMIC"),
> >  SND_SOC_DAPM_INPUT("DMICDAT"),
>
> There is already a datapath for the DMIC here, DMICDAT. Are you
> sure you don't just need to set the "Left/Right ADC Input" muxes
> correctly through the ALSA controls?
>

I will check once more, but so far I was not able to set the mic to
work with DMICDAT. Only with this patch.

Best regards,
Svyatoslav R.

> >
> >  SND_SOC_DAPM_OUTPUT("HPOUTL"),
> > @@ -996,6 +996,9 @@ static const struct snd_soc_dapm_route wm8903_intercon[] = {
> >       { "AIFTXL", NULL, "Left Capture Mux" },
> >       { "AIFTXR", NULL, "Right Capture Mux" },
> >
> > +     { "ADCL", NULL, "DMIC" },
> > +     { "ADCR", NULL, "DMIC" },
> > +
>
> And at any rate these should not be directly connected to the
> ADC you need some muxing to indicate whether the DMIC or AMICs
> are active. Which the DMICDAT path appears to already have.
>
> Thanks,
> Charles