linux-kernel - Re: [RFD] Automatic suspend

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Date:	Tue, 17 Feb 2009 00:28:55 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Monday 16 February 2009, Arjan van de Ven wrote:
> On Mon, 16 Feb 2009 17:40:10 -0500 (EST)
> Alan Stern <stern@...land.harvard.edu> wrote:
> 
> > On Mon, 16 Feb 2009, Rafael J. Wysocki wrote:
> > 
> > > OK, so I think there are two things that user space may be allowed
> > > to do as far as putting devices into low power states is concerned:
> > > * disable/enable the automatic power management of the device
> > > (provided that the driver supports the automatic PM)
> > 
> > Set the automatic PM parameters (idle timeout, state to go to,
> > etc.). And disabling automatic PM altogether (effectively the same as
> > setting the idle timeout to infinity).
> > 
> 
> shouldn't idle timeout etc be internal to the driver?
> Yes policy preferences / constraints makes sense to communicate,
> actual settings do not. For one they keep changing fast all the time
> anyway.

Usually different devices are handled by the same driver.  I don't really
think the same value will be suitable for all of them, so the users should
at least be able to override the driver default, IMO.

Thanks,
Rafael
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