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    SubjectRe: [RFC PATCH] PCIe: Add PCIe runtime D3cold support
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    On Tue, Apr 17, 2012 at 1:07 AM, Rafael J. Wysocki <rjw@sisk.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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