Re: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCIdevices

[Alan Stern]

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.
> > 
> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/