[alsa-devel] How to set TWL4030 to Option2
peter.ujfalusi at nokia.com
Fri May 15 13:09:13 CEST 2009
On Friday 15 May 2009 14:00:07 ext Joonyoung Shim wrote:
> On 5/15/2009 7:05 PM, Lopez Cruz, Misael wrote:
> >>> In current code, as you say, you have to directly change
> >>> the value of the reg cache for setting to option2, also
> >>> you have to modify the REG_OPTION and REG_VOICE_IF reg for
> >>> voice, but this is temporary method.
> >> This can be done with a register write from the DAI init()
> >> function in the machine driver in order to avoid modifying
> >> twl4030.c itself.
> > For audio and voice interface, following things need to be configured:
> > Audio interface:
> > - Output pins state: high impendance or application mode
> > - Enable audio interface
> > Voice interface:
> > - Enable voice data input
> > - Enable voice data output
> > - Output pins state: high impedance or application mode
> > - Enable voice interface
> > I think that interfaces can be enabled in DAI init as Mark suggests,
> Yes, but i worry about whether this reg value can be changed on the fly
> or not.
I believe this needs codec off/on
> > but input/output should be enabled depending on whether we are doing
> > playback/capture or not, and then they should be handled in the codec
> > driver.
> Hmm, the twl4030 codec can do the voice communication at the same time
> while doing playback/capture, is not it?
I think he means the bits in the OPTION register.
The Option1 code toggles some of the bits in case of 4 channel mode.
Same thing can be done for Option2 voice operation I think.
> > For the codec operation mode selection, I still think Peter's
> > advice is more appropriate because options1,2 are not really tight to
> > DAIs. For example, we can be in option2 (voice/audio) and do
> > transferences using both DAIs: I2S and PCM.
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