linux-kernel - Re: [RFC PATCH] PCIe: Add PCIe runtime D3cold support

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Message-ID: <CAC=cRTNdLu=A64YAEp78ENc1h2OJKusXY3Wm9LuY4drz9pbomg@mail.gmail.com>
Date:	Tue, 17 Apr 2012 10:07:56 +0800
From:	huang ying <huang.ying.caritas@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>, bhelgaas@...gle.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-pm@...r.kernel.org, Lin Ming <ming.m.lin@...el.com>,
	Zhang Rui <rui.zhang@...el.com>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC PATCH] PCIe: Add PCIe runtime D3cold support

On Tue, Apr 17, 2012 at 1:07 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> Moreover, I really don't think it's a good idea to put PCI Express ports into
> low-power states in general.  It might work on your platform, whatever it is,
> but that doesn't mean it's going to work on every PCI Express system out
> there.  I actually know of a number of such systems where it surely won't
> work at all.

The runtime PM support for PCIe port is not turned on by default, we need

# echo auto > /sys/devices/pcixxxx:xx/<pci id>/power/control

to turn on it.  And we will turn on it on system it works.  Is this sufficient?

Best Regards,
Huang Ying
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