linux-kernel - Re: [RFD] Automatic suspend

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Date:	Tue, 17 Feb 2009 14:19:24 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Brian Swetland <swetland@...gle.com>
Cc:	Pavel Machek <pavel@...e.cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Tue, Feb 17, 2009 at 06:14:34AM -0800, Brian Swetland wrote:
> [Matthew Garrett <mjg59@...f.ucam.org>]
> > https://lists.linux-foundation.org/pipermail/linux-pm/2009-January/019493.html 
> > says that they're the same on their current platform.
> 
> Well on the Qualcomm MSM72xx SoCs, yeah they're pretty similar -- we can
> reasonably enter power collapse (full shutdown of the ARM11 and
> peripherals) from idle.  But this is not (to my knowledge) true of *all*
> SoCs out there.  Also, resuming from this state can take 5-30ms
> (depending on how distracted the baseband processor is by what's going
> on on the network).

Mm. Resume from deep idle on x86 is typically in the usec range, but 
this is the kind of constraint that pm_qos exposes nicely.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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