Re: [PATCH 2/2] ASoC: codecs: soundwire: call pm_runtime_resume() in component probe

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

>>> What this patch does it make sure that the bus is operation when the
>>> card is created. In usual cases, this is a no-op, this just helps with
>>> corner test cases. It's not plugging a major hole in the pm_runtime
>>> support, just fixing a programming sequence that was not tested before.
>>
>>> One possible objection is that we don't keep the reference and the bus
>>> active until all components are probed. I tried doing this at the ASoC
>>> core level, but that breaks all kinds of devices that have their own
>>> quirky way of dealing with pm_runtime - specifically HDaudio and HDMI.
>>> That's why I added this resume here.
>>
>>> Makes sense?
>>
>> Ish.  Ugh, right.  So it's not fixing anything really, it's mainly
>> papering over cracks where things are being missed.  In any case it's
>> not doing any harm and it helps things for now.
> 
> You got it right. There are additional patches that were sent to use
> pm_runtime_resume_and_get() on set_jack, and other clear cases that were
> missed, but this is more of a blanket "do not harm" resume in case codec
> drivers are missing something.

please wait for merges, we're chasing two regressions with nonsensical
mixer values

numid=5,iface=MIXER,name='PGA4.0 4 Master Capture Volume'
  ; type=BOOLEAN,access=rw---R--,values=2
  : values=on,on
  | dBscale-min=-50.00dB,step=1.00dB,mute=1

and a spurious log that we missed:

snd-soc-dummy snd-soc-dummy: Runtime PM usage count underflow!