Re: [RFC PATCH] PCIe: Add PCIe runtime D3cold support

[huang ying]

On Tue, Apr 17, 2012 at 1:07 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> Moreover, I really don't think it's a good idea to put PCI Express ports into
> low-power states in general. ÂIt 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. ÂI 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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