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

Aggarwal, Anuj anuj.aggarwal at ti.com
Tue May 12 08:50:29 CEST 2009

> -----Original Message-----
> From: Jarkko Nikula [mailto:jhnikula at gmail.com]
> Sent: Tuesday, May 12, 2009 12:10 PM
> To: Aggarwal, Anuj
> Cc: Arun KS; Peter Ujfalusi; sakoman at gmail.com; alsa-devel at alsa-
> project.org; broonie at opensource.wolfsonmicro.com; Anuj Aggarwal
> Subject: Re: [alsa-devel] [PATCH 0/1] ASoC: TWL4030: Headset ramp down
> fix
> On Tue, 12 May 2009 11:44:21 +0530
> "Aggarwal, Anuj" <anuj.aggarwal at ti.com> wrote:
> > > I haven't noticed (yet) but can you post your use case here how to
> > > reproduce it. It would help to hunt is the problem OMAP & TWL4030
> > > specific or is it somewhere else.
> > [Aggarwal, Anuj] There is nothing specific to my use case. I am just
> > trying to playback an audio file (16bit, stereo, 44.1khz) and hearing
> > this sine-tonish sound everytime in the beginning.
> > This artifact was not there when I was using ALSA; it started coming
> > only when I moved to the newer ASoC framework.
> What HW do you use for testing and what was the previous kernel having
> ALSA drivers for it? Can you reproduce the problem with standard aplay
> from alsa-utils?
> For instance I'm curious to know can we have some unknown issue with the
> 1 ksample FIFO inside OMAP3 McBSP2 which is not handled right now with
> the ASoC drivers but if the another kernel has workaround for it.
[Aggarwal, Anuj] I am currently working on OMAP3 EVM, on 2.6.29-rc3 kernel. The previous kernel version where I was using ALSA was 2.6.22. I am using aplay only and observing this artifact on ASoC alone.
> --
> Jarkko

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