linux-kernel - Re: [PATCH] ASoC: fsl_sai: Set SAI Channel Mode to Output Mode

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Date:   Thu, 3 Sep 2020 13:38:30 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_sai: Set SAI Channel Mode to Output Mode

On Thu, Sep 3, 2020 at 11:42 AM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> On Thu, Sep 03, 2020 at 11:09:15AM +0800, Shengjiu Wang wrote:
> > Transmit data pins will output zero when slots are masked or channels
> > are disabled. In CHMOD TDM mode, transmit data pins are tri-stated when
> > slots are masked or channels are disabled. When data pins are tri-stated,
> > there is noise on some channels when FS clock value is high and data is
> > read while fsclk is transitioning from high to low.
> >
> > Signed-off-by: Cosmin-Gabriel Samoila <cosmin.samoila@....com>
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
>
> Acked-by: Nicolin Chen <nicoleotsuka@...il.com>
>
> Though one nit inline:
>
> > ---
> >  sound/soc/fsl/fsl_sai.c | 12 ++++++++++--
> >  sound/soc/fsl/fsl_sai.h |  2 ++
> >  2 files changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> > index 62c5fdb678fc..33b194a5c1dc 100644
> > --- a/sound/soc/fsl/fsl_sai.c
> > +++ b/sound/soc/fsl/fsl_sai.c
> > @@ -486,6 +486,12 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
> >
> >       val_cr4 |= FSL_SAI_CR4_FRSZ(slots);
> >
> > +     /* Output Mode - data pins transmit 0 when slots are masked
> > +      * or channels are disabled
> > +      */
>
> Coding style for multi-line comments. Yet, probably can simplify?
>
>         /* Set to output mode to avoid tri-stated data pins */
Ok, will update in v2.

best regards
wang shengjiu