linux-kernel - Runtime power management during system resume

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Date:	Tue, 24 Aug 2010 18:45:10 +0530
From:	Raj Kumar <rajkumar278@...mail.com>
To:	<stern@...land.harvard.edu>
CC:	<linux-kernel@...r.kernel.org>
Subject: Runtime power management during system resume

Hi Alan,

I have implemented the run time power management in my drivers. I have one
issue regarding System resume.

When the system sleep is triggered as it is mentioned that Power management
core will increment the power_usage counter during prepare and decrements when complete
is called.

Now I have few questions:

1) When the system resume is done, it does not increase the power_usage counter.
 right?

So Does then the driver need to update the power_usage counter with run time power management
core and again set it to active means RPM_ACTIVE?

2) Suppose device is active, means its power_usage counter is already one, Now during system
sleep, does the driver first suspend it with run time power management core and then continue
System suspend?

3) Because I have seen the code of power management core and I did not see the that during
system suspend, run time power management status is updated means RPM_SUSPENDED.
right?

What do you think?

Regards
Raj

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