linux-kernel - Re: [PATCH v3 1/4] ASoC: fsl_asrc: Change asrc_width to asrc

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Message-ID: <20200227174540.GA17040@Asurada-Nvidia.nvidia.com>
Date:   Thu, 27 Feb 2020 09:45:41 -0800
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] ASoC: fsl_asrc: Change asrc_width to asrc_format

On Thu, Feb 27, 2020 at 01:10:19PM +0800, Shengjiu Wang wrote:
> On Thu, Feb 27, 2020 at 11:43 AM Nicolin Chen <nicoleotsuka@...il.com> wrote:
> >
> > On Thu, Feb 27, 2020 at 10:41:55AM +0800, Shengjiu Wang wrote:
> > > asrc_format is more inteligent variable, which is align
> > > with the alsa definition snd_pcm_format_t.
> > >
> > > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > > ---
> > >  sound/soc/fsl/fsl_asrc.c     | 23 +++++++++++------------
> > >  sound/soc/fsl/fsl_asrc.h     |  4 ++--
> > >  sound/soc/fsl/fsl_asrc_dma.c |  2 +-
> > >  3 files changed, 14 insertions(+), 15 deletions(-)
> > >
> > > diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
> > > index 0dcebc24c312..2b6a1643573c 100644
> > > --- a/sound/soc/fsl/fsl_asrc.c
> > > +++ b/sound/soc/fsl/fsl_asrc.c
> >
> > > @@ -600,11 +599,6 @@ static int fsl_asrc_dai_hw_params(struct snd_pcm_substream *substream,
> > >
> > >       pair->config = &config;
> > >
> > > -     if (asrc_priv->asrc_width == 16)
> > > -             format = SNDRV_PCM_FORMAT_S16_LE;
> > > -     else
> > > -             format = SNDRV_PCM_FORMAT_S24_LE;
> >
> > It feels better to me that we have format settings in hw_params().
> >
> > Why not let fsl_easrc align with this? Any reason that I'm missing?
> 
> because the asrc_width is not formal,  in the future we can direct

Hmm..that's our DT binding. And I don't feel it is a problem
to be ASoC irrelative.

> input the format from the dts. format involve the info about width.

Is there such any formal ASoC binding? I don't see those PCM
formats under include/dt-bindings/ folder. How are we going
to involve those formats in DT?