[alsa-devel] [PATCH] ASoC: eve: implement set_bias_level function for rt5514

[Pierre-Louis Bossart]

On 10/25/19 11:14 AM, Lu, Brent wrote:
>>
>> Can you clarify if the rt5514 needs the MCLK while it's doing the hotword
>> detection?
> 
> No, running the detection does not raise the bias level so the set_bias_level
> will not be called. The mclk is only turned on then off in mixer control's handler
> (rt5514_dsp_voice_wake_up_put) when enabling the hotword detection.
> 
>>
>> My point is really that this patch uses a card-level BIAS indication, and I'd like
>> to make sure this does not interfere with the audio DSP being in D3 state.
> 
> The function checks the name of dapm so it would only react when rt5514's
> bias level is changing. And also the idle_bias_off of the codec driver is true so
> it's target_bias_level should not be overwritten in the dapm_power_widgets()
> function. The behavior should be similar to the previous patch which is using
> supply widget.

Ah yes, I did miss this test:

+	if (!component || strcmp(component->name, RT5514_DEV_NAME))
+		return 0;

Looks good then, thanks for the explanations.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>