[alsa-devel] Need help fixing pop/click artifacts in an ASOC driver

[Dimitris Papavasiliou]

On 12/17/18 5:40 PM, Mark Brown wrote:
> That's why I was suggesting that you should be configuring the power
> down time.

I've already tried your suggestion, but unfortunately it doesn't
work in the general case, as it doesn't help when the hw_params
callback is called while the device is opened (but not playing).

I'm quoting my initial reply below for your convenience; you can look
up the whole message if needed.  Apologies in advance, if you've
replied to this and I've somehow missed it.

On 11/18/18 3:37 PM, Dimitris Papavasiliou wrote:
 > Thanks for clarifying about idle_bias_off/ignore_pmdown_time.  As
 > far as I can see, idle_bias_off seems to be set by default, as
 > the pcm512x driver is now a component driver and idle_bias_on is
 > not set to true.  I've also tried to explicitly set it to false,
 > as well as setting use_pmdown_time to false. As far as
 > ignore_pmdown_time is concerned, it seems to be settable at the
 > dai_link level now, which is convenient for my use case.
 >
 > Unfortunately none of this helps.  Although the chip is turned
 > off without delay, it's turned off only while the device is
 > closed.  As soon as the device is opened, it is turned on and
 > kept on during all subsequent hw_params calls, where clock
 > switching takes place.  The pops always get through.