Comment # 108
on bug 75985
from Daniel Drake
If codec devices are always child devices of the controller, then I also wonder
if codec_powered could be completely removed.
Seems like the PM core already ensures the children are inactive before
suspending the controller:
> The idle callback (a subsystem-level one, if present, or the driver one) is
> executed by the PM core whenever the device appears to be idle, which is
> indicated to the PM core by two counters, the device's usage counter and the
> counter of 'active' children of the device.
>
> * If any of these counters is decreased using a helper function provided by
> the PM core and it turns out to be equal to zero, the other counter is
> checked. If that counter also is equal to zero, the PM core executes the
> idle callback with the device as its argument.
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