linux-kernel - Re: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCI devices

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Message-ID: <Pine.LNX.4.44L0.0908180947080.2995-100000@iolanthe.rowland.org>
Date:	Tue, 18 Aug 2009 09:47:40 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Zhang Rui <rui.zhang@...el.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Greg KH <gregkh@...e.de>
Subject: Re: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCI
 devices

On Tue, 18 Aug 2009, Zhang Rui wrote:

> On Mon, 2009-08-17 at 08:20 +0800, Rafael J. Wysocki wrote:
> > Set async_suspend for all PCI devices and PCIe port services.
> > 
> ï»¿Alan said that we can not break the resume order of the uhci/ehci host
> controllers on some platforms.
> 
> For example,
> 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
> Controller #4 (rev 02)
> 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
> Controller #5 (rev 02)
> 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
> Controller #2 (rev 02)
> 00:1a.7 must be resumed after 00:1a.0 and 00:1a.1
> 
> please refer to this thread:
> http://marc.info/?l=linux-acpi&m=122996117918188&w=2
> 
> So I'm afraid we can not suspend/resume the PCI devices in parallel,
> unless we add this off-tree dependency at the same time.

It's okay for testing.  The dependency is needed mostly for 
resume-from-hibernation.

Alan Stern

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