Re: [GIT PULL] On-demand device probing
From: Alan Stern
Date: Tue Oct 20 2015 - 12:04:24 EST
On Tue, 20 Oct 2015, Mark Brown wrote:
> On Tue, Oct 20, 2015 at 10:40:03AM -0400, Alan Stern wrote:
>
> > Furthermore, that applies only to devices that use synchronous suspend.
> > Async suspend is becoming common, and there the only restrictions are
> > parent-child relations plus whatever explicit requirements that drivers
> > impose by calling device_pm_wait_for_dev().
>
> Hrm, this is the first I'd noticed that feature though I see the initial
> commit dates from January.
Async suspend and device_pm_wait_for_dev() were added in January 2010,
not 2015!
> It looks like most of the users are PCs at
> the minute but we should be using it more widely for embedded things,
> there's definitely some cases I'm aware of where it will allow us to
> remove some open coding.
>
> It does seem like we want to be feeding dependency information we
> discover for probing way into the suspend dependencies...
Rafael has been thinking about a way to do this systematically.
Nothing concrete has emerged yet.
Alan Stern
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