[alsa-devel] Cherry Trail + RT5645 devices analog microphone not working.

[Bard Liao]

> Some questions for you:
> 
> 1) I think enabling micbias2 may be a problem on devices with a DMIC,
> could this be a problem?  Currently the codec driver itself contains
> quirks for dmic pin-mapping, maybe we should leave micbias2 disabled
> if dmic pin-mapping is specified through a quirk?

No, micbias2 and DMIC are independent and micbias2 will not be enabled
if we don't add it in the audio route. So I don't think we need to disable it
if dmic pin-mapping is specified.

> 
> 2) Do headset mics normally need a bias current? Could this be headset
> dependent?

Yes, but we don't need to set specific register for that. It means you don't
need to add "micbias1" in the audio route for headset mic.
I think all headset mic will need a bias current.

> 
> Regards,
> 
> Hans
>