[alsa-devel] commit: dpcm: Allow FE to be opened without valid BE routes

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Nov 7 15:28:10 CET 2012

On Wed, Nov 07, 2012 at 09:56:39PM +0900, anish kumar wrote:
> On Wed, 2012-11-07 at 09:48 +0100, Mark Brown wrote:

> > You shouldn't be relying on parsing dmesg for anything, that's never
> > going to be robust as you've just found.  dmesg is for humans. 

> Probably I couldn't explain the problem clearly.Problem is that in our
> case we get sometimes(very random) audio mute in android devices due to
> UCM commands from the platform not sent properly or sent in such a way
> that FE and BE don't get connected.
> This issues are very hard to reproduce and only gets reproduced randomly
> by the test engineer and when it does happen, test engineer takes crash
> dump and provides us the log.So it is almost impossible to know what
> caused this audio mute at that time and all we have is this very
> log(dev_warn(FE and BE not connected)) to let us know that this mute was
> due to platform and not codec or any other problem with the kernel.
> Anyway looks like this idea is not liked by the community so I won't
> push further.

This really just sounds like a basic debugging issue, you can either add
additional trace locally or work to improve the trace infrastructure -
for example, make sure there's tracepoints showing what DPCM does in the
same way there are tracepoints for DAPM.
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