linux-kernel - Re: [PATCH v2 3/5] ASoC: amd: acp: Refactor i2s clocks programming sequence

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Date:   Wed, 25 Jan 2023 11:15:30 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Venkata Prasad Potturu <venkataprasad.potturu@....com>,
        broonie@...nel.org, alsa-devel@...a-project.org
Cc:     Sunil-kumar.Dommati@....com, ssabakar@....com,
        Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        open list <linux-kernel@...r.kernel.org>,
        Basavaraj.Hiregoudar@....com, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        Akihiko Odaki <akihiko.odaki@...il.com>,
        Vijendar.Mukunda@....com,
        V sujith kumar Reddy <Vsujithkumar.Reddy@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2 3/5] ASoC: amd: acp: Refactor i2s clocks programming
 sequence

This patch adds new Sparse warnings [1]:

sound/soc/amd/acp/acp-mach-common.c:189:35: error: restricted
snd_pcm_format_t degrades to integer
sound/soc/amd/acp/acp-mach-common.c:333:35: error: restricted
snd_pcm_format_t degrades to integer
sound/soc/amd/acp/acp-mach-common.c:478:35: error: restricted
snd_pcm_format_t degrades to integer
sound/soc/amd/acp/acp-mach-common.c:619:35: error: restricted
snd_pcm_format_t degrades to integer

> @@ -193,7 +163,11 @@ static int acp_card_rt5682_hw_params(struct snd_pcm_substream *substream,
>  	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
>  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
>  	int ret;
> -	unsigned int fmt;
> +	unsigned int fmt, srate, ch, format;
> +
> +	srate = params_rate(params);
> +	ch = params_channels(params);
> +	format = 8 * params_format(params);

This last line looks suspicious, no? format-to-physical-size conversions
should be using existing macros.

Should it be

format = params_physical_width(params);

?


> +	/* Set tdm/i2s1 master bclk ratio */
> +	ret = snd_soc_dai_set_bclk_ratio(codec_dai, ch * format);
> +	if (ret < 0) {
> +		dev_err(rtd->dev, "Failed to set rt5682 tdm bclk ratio: %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (!drvdata->soc_mclk) {
> +		ret = acp_clk_enable(drvdata, srate, ch * format);
> +		if (ret < 0) {
> +			dev_err(rtd->card->dev, "Failed to enable HS clk: %d\n", ret);
> +			return ret;
> +		}

[1]
https://github.com/thesofproject/linux/actions/runs/4005001249/jobs/6874834205