linux-kernel - Re: [PATCH v2 2/7] ASoC: fsl_rpmsg: Add CPU DAI driver for audio base on rpmsg

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Date:   Mon, 8 Feb 2021 11:51:12 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        timur@...nel.org, nicoleotsuka@...il.com, Xiubo.Lee@...il.com,
        festevam@...il.com, linuxppc-dev@...ts.ozlabs.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/7] ASoC: fsl_rpmsg: Add CPU DAI driver for audio
 base on rpmsg

On Sun, Feb 07, 2021 at 06:23:50PM +0800, Shengjiu Wang wrote:

> +static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
> +			       struct snd_pcm_hw_params *params,
> +			       struct snd_soc_dai *dai)
> +{

...

> +	ret = clk_prepare_enable(rpmsg->mclk);
> +	if (ret)
> +		dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int fsl_rpmsg_hw_free(struct snd_pcm_substream *substream,
> +			     struct snd_soc_dai *dai)
> +{
> +	struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
> +
> +	clk_disable_unprepare(rpmsg->mclk);

hw_params() can be called multiple times and there's no need for it to
be balanced with hw_free(), I'd move this to a different callback (DAPM
should work well).

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