linux-kernel - Re: [PATCH V3] ASoC: Intel: boards: Use FS as nau8825 sysclk in nau88125

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Date:   Thu, 10 Sep 2020 17:37:34 +0200
From:   Radosław Biernacki <rad@...ihalf.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Lech Betlej <Lech.Betlej@...el.com>,
        alsa-devel@...a-project.org, Todd Broch <tbroch@...gle.com>,
        Harshapriya <harshapriya.n@...el.com>,
        John Hsu <KCHSU0@...oton.com>, linux-kernel@...r.kernel.org,
        "Sienkiewicz, Michal" <michal.sienkiewicz@...el.com>,
        Ben Zhang <benzh@...omium.org>,
        Mac Chiang <mac.chiang@...el.com>,
        Yong Zhi <yong.zhi@...el.com>, Marcin Wojtas <mw@...ihalf.com>,
        Vamshi Krishna <vamshi.krishna.gopal@...el.com>,
        Alex Levin <levinale@...gle.com>
Subject: Re: [PATCH V3] ASoC: Intel: boards: Use FS as nau8825 sysclk in
 nau88125_* machine

Thank you Pierre.
All your comments are addressed in V4.
skylake_nau8825_resume_post() is in fact unnecessary as my test shows
no difference if we do the FLL setup in skylake_nau8825_trigger().
patch is coming...

wt., 8 wrz 2020 o 22:59 Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> napisał(a):


>
> Sorry, I couldn't resist adding three more comments to improve further:
>
> > -static int skylake_nau8825_hw_params(struct snd_pcm_substream *substream,
> > -     struct snd_pcm_hw_params *params)
> > +static int skylake_nau8825_trigger(struct snd_pcm_substream *substream, int cmd)
> >   {
> >       struct snd_soc_pcm_runtime *rtd = substream->private_data;
> > +     struct snd_pcm_runtime *runtime = substream->runtime;
> >       struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
> > -     int ret;
> > -
> > -     ret = snd_soc_dai_set_sysclk(codec_dai,
> > -                     NAU8825_CLK_MCLK, 24000000, SND_SOC_CLOCK_IN);
> > +     int ret = 0;
> >
> > -     if (ret < 0)
> > -             dev_err(rtd->dev, "snd_soc_dai_set_sysclk err = %d\n", ret);
> > +     switch (cmd) {
> > +     case SNDRV_PCM_TRIGGER_START:
> > +             ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0,
> > +                                          SND_SOC_CLOCK_IN);
>
> Maybe a simple comment to explain what this does?
>
> > +             if (ret < 0) {
> > +                     dev_err(codec_dai->dev, "can't set FS clock %d\n", ret);
> > +                     break;
> > +             }
> > +             ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate,
> > +                                       runtime->rate * 256);
> > +             if (ret < 0)
> > +                     dev_err(codec_dai->dev, "can't set FLL: %d\n", ret);
> > +             break;
>
> You could replace this by a /* fallthrough */ statement?
>
> > +     case SNDRV_PCM_TRIGGER_RESUME:
> > +             ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate,
> > +                                       runtime->rate * 256);
> > +             if (ret < 0)
> > +                     dev_err(codec_dai->dev, "can't set FLL: %d\n", ret);
> > +             break;
> > +     }
>
> > +static int __maybe_unused skylake_nau8825_resume_post(struct snd_soc_card *card)
> > +{
> > +     struct snd_soc_dai *codec_dai;
> > +
> > +     codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI);
> > +     if (!codec_dai) {
> > +             dev_err(card->dev, "Codec dai not found\n");
> > +             return -EIO;
> > +     }
> > +
> > +     dev_dbg(codec_dai->dev, "playback_active:%d playback_widget->active:%d codec_dai->rate:%d\n",
> > +             codec_dai->stream_active[SNDRV_PCM_STREAM_PLAYBACK],
> > +             codec_dai->playback_widget->active,
> > +             codec_dai->rate);
> > +
> > +     if (codec_dai->stream_active[SNDRV_PCM_STREAM_PLAYBACK] &&
> > +         codec_dai->playback_widget->active)
> > +             snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0,
> > +                                    SND_SOC_CLOCK_IN);
>
> And that part is also worthy of a comment, e.g. why not do this as part
> of the TRIGGER_RESUME and why only for playback?
>
>
> > --- a/sound/soc/intel/boards/skl_nau88l25_ssm4567.c
> > +++ b/sound/soc/intel/boards/skl_nau88l25_ssm4567.c
>
> same comments for this other machine driver.
>