[alsa-devel] [ice1712] Word Clock with Delta1010 E

Takashi Iwai tiwai at suse.de
Thu May 20 17:48:22 CEST 2010

At Wed, 19 May 2010 21:00:38 +0200,
Bernhard Walle wrote:
> Hi,
> we have a problem with the word clock input of the Delta 1010 E. At
> first: I modified the source code of envy24control to accept the Delta
> 1010 E as subdevice so that it allows to set the word clock. I'll post
> the patch after it works with the driver. However, the problem also
> exists when I use plain alsamixer or amixer.
> With the unmodified driver, I'm able to turn word clock on but whenever
> I record something, the arecord program (or Audacity) doesn't get any
> samples.
> With OSS (which we're using now but we're trying to switch to ALSA) my
> colleague Markus Prosch made a patch with lots of try & error that made
> the word clock working:
> http://opensound.hg.sourceforge.net/hgweb/opensound/opensound/rev/6a4bad6e7422
> When I try to "port" that patch to ALSA, the behaviour changes: The
> recording works, but the sample rate is too low so that it sounds quite
> strange.
> In any case: In the same hardware setup, it works flawlessly with OSS.
> Also, we had no problem with the older Delta 1010. It seems to be an
> incompatible change (or bug ;)) in revision E.
> Are there any devs here that know the hardware better and could help me
> in debugging that issue? Without any deeper sound driver knowledge and
> without any data sheet, that's quite hard for me.

Is register 0x01 set with bit 0x10 (aka SPDIF input-clock-master)?
I haven't touched this driver for a very long time, so I'm not sure
whether envy24control changed this bit automatically with word sync


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