linux-kernel - Re: [RFC] PCI: Runtime power management

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Message-Id: <200908142115.25946.rjw@sisk.pl>
Date:	Fri, 14 Aug 2009 21:15:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	linux-pci@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC] PCI: Runtime power management

On Friday 14 August 2009, Jesse Barnes wrote:
> On Thu, 13 Aug 2009 01:29:25 +0100
> Matthew Garrett <mjg59@...f.ucam.org> wrote:
> 
> > I got a fixed BIOS from Dell and have been able to get this working
> > now. It seems entirely happy with USB, but I'd like some sanity
> > checks on whether I'm doing this correctly. There's certainly a
> > couple of quirks related to setting the ACPI GPE type that would need
> > a little bit of work in the ACPI layer, and it breaks ACPI-mediated
> > PCI hotplug though that's easy enough to fix by just calling into the
> > hotplug code from the core notifier.
> > 
> > This patch builds on top of Rafael's work on systemwide runtime power
> > management. It supports suspending and resuming PCI devices at
> > runtime, enabling platform wakeup events that allow the devices to
> > automatically resume when appropriate. It currently requires platform
> > support, but PCIe setups could be supported natively once native PCIe
> > PME code has been added to the kernel.
> 
> PCI bits look pretty good to me, though Rafael should take a look too.

I'm going to do that shortly.

> Card readers and firewire could benefit from similar treatment,

As well us network adapters.

> maybe that would get us to .5W territory on some machines.

Hopefully. :-)

Thanks,
Rafael
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