linux-kernel - Re: [PATCH 4/5] ASoC: amd: add Machine driver for Jadeite platform

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Message-ID: <Yr2Eq0BUmi6mZsRY@sirena.org.uk>
Date:   Thu, 30 Jun 2022 12:10:35 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>
Cc:     alsa-devel@...a-project.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, Alexander.Deucher@....com,
        Basavaraj.Hiregoudar@....com, Sunil-kumar.Dommati@....com,
        zhuning@...rest-semi.com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] ASoC: amd: add Machine driver for Jadeite platform

On Thu, Jun 30, 2022 at 08:47:54AM +0530, Vijendar Mukunda wrote:

> +static int st_es8336_hw_params(struct snd_pcm_substream *substream,
> +			       struct snd_pcm_hw_params *params)
> +{
> +	int ret = 0;
> +	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
> +	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
> +
> +	ret = snd_soc_dai_set_sysclk(codec_dai, 0, params_rate(params) * 256, SND_SOC_CLOCK_IN);
> +	if (ret < 0) {
> +		dev_err(rtd->dev, "can't set codec sysclk: %d\n", ret);
> +		return ret;
> +	}
> +	return ret;
> +}

> +static const unsigned int st_channels[] = {
> +	DUAL_CHANNEL,
> +};
> +
> +static const unsigned int st_rates[] = {
> +	48000,
> +};

If the clock rate is fixed why not just set the sysclk once at startup
too?

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