linux-kernel - Re: runtime PM + legacy PM

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Message-Id: <201112252328.19649.rjw@sisk.pl>
Date:	Sun, 25 Dec 2011 23:28:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavan Savoy <pavan_savoy@...y.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: runtime PM + legacy PM

On Sunday, December 25, 2011, Pavan Savoy wrote:
> On Thu, Dec 22, 2011 at 3:55 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Thursday, December 22, 2011, you wrote:
> >> Is there a need for the legacy PM to be enabled when device/drivers
> >> run-time PM is supported ?
> >
> > What do you mean by "legacy PM"?
> 
> I meant suspend/resume driven by user-space.

It's not "legacy", it's just a different approach to power management.

In principle, it generally is not necessary to support system suspend/resume,
but if your driver is used on a platform that supports it, the driver should
support it too.

Thanks,
Rafael
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