[alsa-devel] [PATCH 1/1] ASoC: TWL4030: Wait RAMP_DELAY on headsetl_event: POST_PMD

Jarkko Nikula jhnikula at gmail.com
Mon May 11 14:03:20 CEST 2009

On Mon, 11 May 2009 14:14:25 +0300
Peter Ujfalusi <peter.ujfalusi at nokia.com> wrote:

> This patch fixes the - agressive - 'tuck' sound heard when
> the codec goes to standby mode.
> We need to wait for the ramp down completion in case of
> headsetl_event:POST_PMD.
For my ears this sounds that the power-down pop is now even worse. I'm
listening with some 32 ohm headphones connected into Beagle.

Before it was kind of sharp snap but now it is snap + low-frequency
tuck/pop. Positive that this low-frequency pop sounds kind of same than
the power-up pop so there is now ramp in both events when coupling
capasitor is charging/discharging.

Do you know is the capacitor coupling configuration correct? TPS65950
is mentioning it but I don't find it at quick look where to configure it
for ac-coupled connection.


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