[alsa-devel] MPC5200/WM9712 mute problem

Jon Smirl jonsmirl at gmail.com
Fri Aug 7 17:16:12 CEST 2009

On Fri, Aug 7, 2009 at 10:48 AM, John Bonesio<bones at secretlab.ca> wrote:
> On Fri, 2009-08-07 at 10:56 +0100, Mark Brown wrote:
>> On Thu, Aug 06, 2009 at 10:28:41AM -0700, John Bonesio wrote:
>> > I'm open to more suggestions or thoughts on the approach I've taken so
>> > far.
>> The approach you've been taking sounds reasonable; at this point I'd be
>> looking at trying to confirm that the controller is doing what's been
>> asked of it.  Checking that the CODEC power rails are all within spec
>> and looking at other bits in the same register may also be useful.

You can turn on an interrupt that gets triggered when the register
wire completes. That would give you a clue if too many register writes
are happening.

A DSO or logical analyzer would make this much faster to isolate.

>> Is the system otherwise idle when the problem occurs?
> Yes the system is idle - just me fiddling with the mute settings.
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Jon Smirl
jonsmirl at gmail.com

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