pm runtime and system suspend resume

chao xie xiechao.linux at
Thu Jun 21 20:48:13 EDT 2012

2012/6/21 Alan Stern <stern at>:
> 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.
I will read the document. Thanks very much.

> Alan Stern

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