[alsa-devel] [PATCH 1/1] ASoC: TWL4030: Wait RAMP_DELAY on headsetl_event: POST_PMD
peter.ujfalusi at nokia.com
Thu May 14 14:44:47 CEST 2009
On Thursday 14 May 2009 12:56:21 ext Mark Brown wrote:
> On Thu, May 14, 2009 at 12:48:49PM +0300, Peter Ujfalusi wrote:
> > This is not really possible with the twl4030 codec.
> > For simplicity, let's take the Audio left2 route:
> > DACL2 -> PGAL2 ---> PreDriveL
> > |-> PreDriveR
> > |-> HeadsetL
> > |-> CarkitL
> > |-> HandsFreeL
> > |-> HandsFreeR
> > \-> Earpiece
> > At least the Headset and HandsFree needs special mantra for the pop
> > removal. If the Headset is not connected/used than there is no need to do
> > the HS pop attenuation.
> The event could check the current setup and do whatever's appropriate?
I have to think about this, but at first sight it does look awfully
complicated thing to do (4 PGA, 7 output with mixers, 2+1 output mux)...
> BTW, since you're saying the required ramp time is clock dependent
> shouldn't it also be possible to configure the ramp time automatically
> based on the clock that's been configured?
The patch that I have sent is calculating the needed delay based on the MCLK +
I think I don't want to fixate the ramp delay to any value (meaning that the
delay would last around 50ms). This seams to be also board specific, so I
would rather leave this to the user to find the best value for the given
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