[alsa-devel] [PATCH 1/1] ASoC: TWL4030: Headset VMID ramp fix

[Peter Ujfalusi]

On Friday 08 May 2009 15:32:08 ext Mark Brown wrote:
> On Fri, May 08, 2009 at 02:56:50PM +0300, Peter Ujfalusi wrote:
> > Realistically we can not add 2581ms delay to the headsetl_event
> > function... We could keep the VMID enabled all the time (which increases
> > the idle power consumption by ~0.001A), but then the muting of the
> > headset
>
> Generally you want to leave VMID up all the time for exactly this reason
> - ramping it cleanly with that generation of hardware just takes too
> long to do it regularly during normal operation.
>
> > (HS_POP_GAIN:HSL_GAIN, HSR_GAIN = 0) will give the 'tuck'...
>
> Have you tried ramping the gain down gradually?  DAPM can do that for you
> automatically if the volume control is attached to the PGA.

I'll try that on Monday, but is it a problem that the 
HSL_GAIN and HSR_GAIN looks like this:
0 == Off
1 == 6 dB
2 == 0 dB
3 == -6 dB

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