linux-kernel - Re: [PATCH 4/7] ASoC: codecs: wcd938x: add basic controls

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Message-ID: <509b836d-520d-4528-0f1a-da0c21e86c68@linaro.org>
Date:   Mon, 15 Mar 2021 10:04:46 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     perex@...ex.cz, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, lgirdwood@...il.com
Subject: Re: [PATCH 4/7] ASoC: codecs: wcd938x: add basic controls

Thanks Mark for review,

On 12/03/2021 15:55, Mark Brown wrote:
> On Thu, Mar 11, 2021 at 05:34:13PM +0000, Srinivas Kandagatla wrote:
> 
>> +	if (wcd938x->variant == WCD9380) {
> 
> switch statements please.
> 
>> +		if (mode_val == CLS_H_HIFI || mode_val == CLS_AB_HIFI) {
>> +			dev_info(component->dev,
>> +				"%s:Invalid HPH Mode, default to CLS_H_ULP\n",
>> +				__func__);
>> +			mode_val = CLS_H_ULP;
>> +		}
> 
> If the value can't be set an error should be returned rather than the
> input ignored.

I agree with all the comments related to switch statements and ignoring 
return values, will address them in next version.

> 
>> +static int wcd938x_ear_pa_gain_get(struct snd_kcontrol *kcontrol,
>> +				   struct snd_ctl_elem_value *ucontrol)
>> +{
>> +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
>> +
>> +	ucontrol->value.integer.value[0] = snd_soc_component_read_field(component,
>> +						WCD938X_ANA_EAR_COMPANDER_CTL,
>> +						WCD938X_EAR_GAIN_MASK);
>> +
>> +	return 0;
>> +}
> 
> This just looks like a normal operation?
> 
Yes, this can probably go into a TLV control, will fix this in next version.


--srini
>> +static int wcd938x_ear_pa_gain_put(struct snd_kcontrol *kcontrol,
>> +				   struct snd_ctl_elem_value *ucontrol)
>> +{
>> +	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
>> +	struct wcd938x_sdw_priv *wcd = snd_soc_component_get_drvdata(component);
>> +	struct wcd938x_priv *wcd938x = wcd->wcd938x;
>> +
>> +	if (!wcd938x->comp1_enable) {
>> +		snd_soc_component_write_field(component,
>> +				WCD938X_ANA_EAR_COMPANDER_CTL,
>> +				WCD938X_EAR_GAIN_MASK,
>> +				ucontrol->value.integer.value[0]);
>> +	}
> 
> Again, values should not be ignored on error.
> 
>> +	if (wcd938x->variant == WCD9380) {
>> +		ret = snd_soc_add_component_controls(component, wcd9380_snd_controls,
>> +					ARRAY_SIZE(wcd9380_snd_controls));
>> +		if (ret < 0) {
>> +			dev_err(component->dev,
>> +				"%s: Failed to add snd ctrls for variant: %d\n",
>> +				__func__, wcd938x->variant);
>> +			goto err;
>> +		}
>> +	}
>> +	if (wcd938x->variant == WCD9385) {
> 
> Again, switch statements - I'll never understand why people seem so
> intent on writing if trees :(
>