[alsa-devel] [PATCH v5 2/6] ASoC: sgtl5000: Improve VAG power and mute control

[Cezary Rojewski]

On 2019-07-18 11:02, Oleksandr Suvorov wrote:
>   
> +enum {
> +	HP_POWER_EVENT,
> +	DAC_POWER_EVENT,
> +	ADC_POWER_EVENT,
> +	LAST_POWER_EVENT
> +};
> +
> +static u16 mute_mask[] = {
> +	SGTL5000_HP_MUTE,
> +	SGTL5000_OUTPUTS_MUTE,
> +	SGTL5000_OUTPUTS_MUTE
> +};

If mute_mask[] is only used within common handler, you may consider 
declaring const array within said handler instead (did not check that 
myself).
Otherwise, simple comment for the second _OUTPUTS_MUTE should suffice - 
its not self explanatory why you doubled that mask.

> +
>   /* sgtl5000 private structure in codec */
>   struct sgtl5000_priv {
>   	int sysclk;	/* sysclk rate */
> @@ -137,8 +157,109 @@ struct sgtl5000_priv {
>   	u8 micbias_voltage;
>   	u8 lrclk_strength;
>   	u8 sclk_strength;
> +	u16 mute_state[LAST_POWER_EVENT];
>   };
>   

When I spoke of LAST enum constant, I did not really had this specific 
usage in mind.

 From design perspective, _LAST_ does not exist and should never be 
referred to as "the next option" i.e.: new enum constant.
That is way preferred usage is:
u16 mute_state[ADC_POWER_EVENT+1;
-or-
u16 mute_state[LAST_POWER_EVENT+1];

Maybe I'm just being radical here :)

Czarek