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

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Date:   Fri, 1 Jul 2022 00:06:35 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Mark Brown <broonie@...nel.org>
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 6/30/22 4:40 PM, Mark Brown wrote:
> 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?
Yes. We can set sysclk once at the startup as clock rate is fixed.
Will modify the code and post the new patch.