[alsa-devel] [PATCH 0/1] ASoC: TWL4030: Headset ramp down fix

Arun KS getarunks at gmail.com
Mon May 11 14:57:28 CEST 2009

On Mon, May 11, 2009 at 4:44 PM, Peter Ujfalusi
<peter.ujfalusi at nokia.com> wrote:
> Hello,
> The following patch should fix (or at least makes it less intrusive) the 'tuck'
> phenomena on observed on the twl4030 Headset outputs when the codec is going
> to standby mode.
> I have debugged this with the scope and if we are not waiting RAMP_DELAY time,
> the VMID is cut before it reaching 0, which generates the 'tuck'.
> Note that I have not removed the control for the RAMP_DELAY configuration, the
> code will use that to calculate the needed delay (also the sysfreq is needed,
> which also stored).
> However I do think that one should not touch the RAMP_DELAY...
> It would be nice to hear from you guys, if it solves/softens the 'tuck'.

'Tuck' still present on omap3evm board.

> ---
> Peter Ujfalusi (1):
>  ASoC: TWL4030: Wait RAMP_DELAY on headsetl_event: POST_PMD
>  sound/soc/codecs/twl4030.c |   20 ++++++++++++++++++++
>  1 files changed, 20 insertions(+), 0 deletions(-)

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