[alsa-devel] [PATCH 3/3] ASoC: davinci-mcasp: Optimize pm_runtime usage and clean up the init code

Mark Brown broonie at kernel.org
Tue Apr 22 20:52:16 CEST 2014

On Tue, Apr 22, 2014 at 03:20:33PM +0300, Peter Ujfalusi wrote:
> On 04/22/2014 02:47 PM, Mark Brown wrote:

> > This does mean that if the device gets enumerated but isn't used in the
> > system it won't go to runtime idle since the DAI level probe is only
> > called when we're building a card.

> If the given mcasp is not used as part of a card, it should not have been
> probed in the first place (at least with DT boot we can control this). If the
> driver is probed for a mcasp instance and it is not part of any card than it
> can be left disabled IMHO no need for runtime pm to take care of it.
> I might missed something related to runtime pm, but this is my understanding.

Sure, but you then also have the cases where for whatever reason the
card doesn't probe (some other driver missing for example).  Probably
almost all the time it's not going to make a practical difference but it
just feels like a step in the wrong direction for a minimal gain.
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