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

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Message-ID: <20090814103719.79e99d91@jbarnes-g45>
Date:	Fri, 14 Aug 2009 10:37:19 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 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.
Card readers and firewire could benefit from similar treatment, maybe
that would get us to .5W territory on some machines.

-- 
Jesse Barnes, Intel Open Source Technology Center
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