linux-kernel - Re: pm runtime and system suspend resume

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Message-ID: <CAK9wHMTYoxVqj3Ls3Y7NEwgL4Y=XnxGFzyxfy4bseMR_Hhzp7Q@mail.gmail.com>
Date:	Fri, 22 Jun 2012 08:48:13 +0800
From:	chao xie <xiechao.linux@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	rjw@...k.pl, pavel@....cz, linux-arm-kernel@...ts.infradead.org
Subject: Re: pm runtime and system suspend resume

2012/6/21 Alan Stern <stern@...land.harvard.edu>:
> 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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