[alsa-devel] [PATCH 1/3] ASoC: TWL4030: Enable voice filters for voice sidetone

Peter Ujfalusi peter.ujfalusi at nokia.com
Tue Jun 23 15:18:35 CEST 2009

On Tuesday 23 June 2009 13:16:16 ext Mark Brown wrote:
> On Tue, Jun 23, 2009 at 08:38:20AM +0300, Peter Ujfalusi wrote:
> > Now if you start an audio playback (which will enable the ARXL1, even if
> > we are in Option2), than you stop it: the ARXL1 (which is VRX in Option2)
> > bit will be turned off... Now I'm not sure how this will be handled by
> > the ASoC core.
> > What I mean is: One path enabled this bit, than another path also enables
> > the same bit, than it disables it. Will the first path notice it? Or will
> > it think that the bit is still enabled?
> Sounds like a possible case for a supply widget, though the fact that
> you've got both option 1 and option 2 is fun.
Well I use the fun word for a bit different things...
I have to check what actually the supply widget supposed to be doing and what 
is it for.

> If the driver were a
> proper platform driver you could select between option 1 and option 2 in
> platform data (assuming that's sensible) and register different widgets
> depending on which was in use.
I have been looking at this. It does not seamed that complicated. I had 
written some of the code, but than it turned out a bit more complicated:
In twl4030 series the Vibra interface also reside inside of the CODEC part.
in short: twl4030 is a MFD, than the TWL4030 codec itself also and MFD..
So in order to get this in a proper way, this should be handled somehow 
(another 'fake' MFD for the twl4030 codec/vibra perhaps).

This is still in my list, but certainly need more time to get a reasonable 
good implementation. 


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