pm runtime and system suspend resume

Alan Stern stern at
Thu Jun 21 10:27:46 EDT 2012

On Thu, 21 Jun 2012, chao xie wrote:

> I check the code, __device_suspend will invoke dev->pm_domain->ops
> first if dev->pm_domain is not NULL.
> Taking "suspend" as esample, i can do the following things in the
> dev->pm_domain->ops->suspend
> 1. invoke dev->driver->pm->suspend for suspending the device
> 2. do what we do in dev->pm_domain->ops->runtime_suspend for
> suspending the surrounded logic, for example, shutdown the phy or
> clocks.
> So is above implementation fine?

Yes, that sounds like it will work.  Watch out for the case where your 
device is already runtime-suspended when a system suspend occurs.

Have you read section 6 in Documentation/power/runtime_pm.txt?  It is 
related to your question.

Alan Stern

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