linux-kernel - Re: [PATCH 1/2] ALSA: pcm: Add support for 705.6KHz and 768KHz sample rate

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Date:   Tue, 27 Apr 2021 19:12:33 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        alsa-devel@...a-project.org, Mark Brown <broonie@...nel.org>,
        Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH 1/2] ALSA: pcm: Add support for 705.6KHz and 768KHz sample rate

On Tue, Apr 27, 2021 at 6:56 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Tue, 27 Apr 2021 12:34:22 +0200,
> Shengjiu Wang wrote:
> >
> > Some high resolution codecs support 705.6KHz and 768KHz rates.
> > So extend supported sample rate to 768kHz in pcm.h.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
>
> How many devices require it for now?

I have two devices, AK4458, AK5558.

>
> I don't want to extend the core definitions blindly unless those rates
> are really commonly used.  You can add those specific rates in the
> codec driver instead.

Ok, this is an option.

>
>
> thanks,
>
> Takashi
>
> > ---
> >  include/sound/pcm.h | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/include/sound/pcm.h b/include/sound/pcm.h
> > index 2e1200d17d0c..88056824ffec 100644
> > --- a/include/sound/pcm.h
> > +++ b/include/sound/pcm.h
> > @@ -121,6 +121,8 @@ struct snd_pcm_ops {
> >  #define SNDRV_PCM_RATE_192000                (1<<12)         /* 192000Hz */
> >  #define SNDRV_PCM_RATE_352800                (1<<13)         /* 352800Hz */
> >  #define SNDRV_PCM_RATE_384000                (1<<14)         /* 384000Hz */
> > +#define SNDRV_PCM_RATE_705600                (1<<15)         /* 705600Hz */
> > +#define SNDRV_PCM_RATE_768000                (1<<16)         /* 768000Hz */
> >
> >  #define SNDRV_PCM_RATE_CONTINUOUS    (1<<30)         /* continuous range */
> >  #define SNDRV_PCM_RATE_KNOT          (1<<31)         /* supports more non-continuos rates */
> > @@ -136,6 +138,9 @@ struct snd_pcm_ops {
> >  #define SNDRV_PCM_RATE_8000_384000   (SNDRV_PCM_RATE_8000_192000|\
> >                                        SNDRV_PCM_RATE_352800|\
> >                                        SNDRV_PCM_RATE_384000)
> > +#define SNDRV_PCM_RATE_8000_768000   (SNDRV_PCM_RATE_8000_768000|\
> > +                                      SNDRV_PCM_RATE_705600|\
> > +                                      SNDRV_PCM_RATE_768000)
> >  #define _SNDRV_PCM_FMTBIT(fmt)               (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
> >  #define SNDRV_PCM_FMTBIT_S8          _SNDRV_PCM_FMTBIT(S8)
> >  #define SNDRV_PCM_FMTBIT_U8          _SNDRV_PCM_FMTBIT(U8)
> > --
> > 2.27.0
> >