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SubjectRe: [PATCH 1/2] ASoC: mediatek: mt8195: update control for RT5682 series
On Wed, Dec 15, 2021 at 02:58:34PM +0800, Trevor Wu wrote:
> --- a/sound/soc/mediatek/mt8195/mt8195-mt6359-rt1011-rt5682.c
> +++ b/sound/soc/mediatek/mt8195/mt8195-mt6359-rt1011-rt5682.c
[...]
> +static int mt8195_set_bias_level_post(struct snd_soc_card *card,
> + struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
> +{
> + struct snd_soc_component *component = dapm->component;
> + struct mt8195_mt6359_rt1011_rt5682_priv *priv =
> + snd_soc_card_get_drvdata(card);
> + int ret = 0;

ret doesn't need to be initialized.

> + /*
> + * It's required to control mclk directly in the set_bias_level_post
> + * function for rt5682 and rt5682s codec, or the unexpected pop happens
> + * at the end of playback.
> + */
> + if (!component ||
> + (strcmp(component->name, RT5682_DEV0_NAME) &&
> + strcmp(component->name, RT5682S_DEV0_NAME)))
> + return 0;
> +
> + if (IS_ERR(priv->i2so1_mclk))
> + return 0;

I doubt if it needs to check priv->i2so1_mclk. In other words, if IS_ERR(priv->i2so1_mclk) is true in _probe, does mt8195_set_bias_level_post() get called?

> + switch (level) {
> + case SND_SOC_BIAS_OFF:
> + if (!__clk_is_enabled(priv->i2so1_mclk))
> + return 0;
> +
> + dev_dbg(card->dev, "Disable i2so1");
> + clk_disable_unprepare(priv->i2so1_mclk);

I would suggest move dev_dbg() later than clk_disable_unprepare() which means "Disable i2so1" is done.

> + break;
> + case SND_SOC_BIAS_ON:
> + dev_dbg(card->dev, "Enable i2so1");
> + ret = clk_prepare_enable(priv->i2so1_mclk);
> + if (ret) {
> + dev_err(card->dev, "Can't enable mclk, err: %d\n", ret);

The error message can be more specific. "Cannot enable i2so1" for example.

> + return ret;
> + }

Also, I would suggest move dev_dbg() later than clk_prepare_enable(). Otherwise, it could fail to prepare or enable but still can see "Enable i2so1" message.

> + break;
> + default:
> + break;
> + }
> +
> + return ret;

The function doesn't use any gotos. To be concise, "return 0;".

> @@ -1072,6 +1119,19 @@ static int mt8195_mt6359_rt1011_rt5682_dev_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> + priv->i2so1_mclk = devm_clk_get(&pdev->dev, "i2so1_mclk");
> + if (IS_ERR(priv->i2so1_mclk)) {
> + ret = PTR_ERR(priv->i2so1_mclk);
> + if (ret == -ENOENT) {
> + dev_dbg(&pdev->dev,
> + "Failed to get i2so1_mclk, defer probe\n");
> + return -EPROBE_DEFER;
> + }

Does devm_clk_get_optional() could make the block more concise?

> +
> + dev_err(&pdev->dev, "Failed to get i2so1_mclk, err:%d\n", ret);

If devm_clk_get() is possible to return -EPROBE_DEFER too, use dev_err_probe().

> --- a/sound/soc/mediatek/mt8195/mt8195-mt6359-rt1019-rt5682.c
> +++ b/sound/soc/mediatek/mt8195/mt8195-mt6359-rt1019-rt5682.c
[...]
> +static int mt8195_set_bias_level_post(struct snd_soc_card *card,
> + struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
> +{
> + struct snd_soc_component *component = dapm->component;
> + struct mt8195_mt6359_rt1019_rt5682_priv *priv =
> + snd_soc_card_get_drvdata(card);
> + int ret = 0;

Ditto, see comments above.

> +
> + /*
> + * It's required to control mclk directly in the set_bias_level_post
> + * function for rt5682 and rt5682s codec, or the unexpected pop happens
> + * at the end of playback.
> + */
> + if (!component ||
> + (strcmp(component->name, RT5682_DEV0_NAME) &&
> + strcmp(component->name, RT5682S_DEV0_NAME)))
> + return 0;
> +
> + if (IS_ERR(priv->i2so1_mclk))
> + return 0;

Ditto, see comments above.

> +
> + switch (level) {
> + case SND_SOC_BIAS_OFF:
> + if (!__clk_is_enabled(priv->i2so1_mclk))
> + return 0;
> +
> + dev_dbg(card->dev, "Disable i2so1");
> + clk_disable_unprepare(priv->i2so1_mclk);
> + break;
> + case SND_SOC_BIAS_ON:
> + dev_dbg(card->dev, "Enable i2so1");
> + ret = clk_prepare_enable(priv->i2so1_mclk);
> + if (ret) {
> + dev_err(card->dev, "Can't enable mclk, err: %d\n", ret);
> + return ret;
> + }
> + break;
> + default:
> + break;
> + }

Ditto, see comments above for the block.

> +
> + return ret;

Ditto, see comments above.

> @@ -1285,6 +1326,19 @@ static int mt8195_mt6359_rt1019_rt5682_dev_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> + priv->i2so1_mclk = devm_clk_get(&pdev->dev, "i2so1_mclk");
> + if (IS_ERR(priv->i2so1_mclk)) {
> + ret = PTR_ERR(priv->i2so1_mclk);
> + if (ret == -ENOENT) {
> + dev_dbg(&pdev->dev,
> + "Failed to get i2so1_mclk, defer probe\n");
> + return -EPROBE_DEFER;
> + }
> +
> + dev_err(&pdev->dev, "Failed to get i2so1_mclk, err:%d\n", ret);
> + return ret;
> + }

Ditto, see comments above for the block.

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