Re: [PATCH 3/4] ALSA: hda: Refactor controller PM to use direct-complete optimization

[Takashi Iwai]

On Fri, 23 Oct 2020 12:23:37 +0200,
Kai-Heng Feng wrote:
> @@ -1103,10 +1096,8 @@ static int azx_runtime_suspend(struct device *dev)
>  	chip = card->private_data;
>  
>  	/* enable controller wake up event */
> -	if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) {
> -		azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
> -			   STATESTS_INT_MASK);
> -	}
> +	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
> +		   STATESTS_INT_MASK);

Hrm, this doesn't look safe.  Applying WAKEEN unconditionally means
that the machine may get woken up from the system suspend, and we
don't want that.


thanks,

Takashi