[alsa-devel] [PATCH] ASoC: TWL4030: change DAPMs for analog microphone selection

[Peter Ujfalusi]

On Thursday 30 April 2009 10:20:16 ext Joonyoung Shim wrote:
> On 4/30/2009 3:51 PM, Peter Ujfalusi wrote:
> > On Wednesday 29 April 2009 03:19:21 ext Joonyoung Shim wrote:
> >> I read it at TRM too, but cannot believe it such mixer of outputs.
> >>
> >> Actually, i setted to 1 both HSMIC_EN bit and MAINMIC_EN bit for the
> >> ANAMICL register, and recorded sound from headset mic and main mic. The
> >> result is that both sounds are recorded.
> >>
> >> So, to be sure this part, can you inquire about it to TI side?
> >
> > I'll ask Ti about this and also about the output mixer/mux thing, just to
> > be sure that we are not doing anything 'illegal' with those either.
> >
> > We should wait with this until Ti responds, I'll let you know what is
> > their opinion...
>
> Ok, i see.
>
> Thanks.

I got the response for this:
On the output side: ear, predive, HS, Carkit is mixable, but the mixing is 
summing and not averaging, so if the inputs are close to full, it may cause 
saturation.

On the input side: you are right, the inputs can be mixed, but if we enable 
more than one input at the same time, the input impedance of the input 
amplifier will be reduced.

Just in case, can you resend the patch?

-- 
Péter