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    SubjectRe: [PATCH] sil3531: has no PM capability, remove support.
    On 04/09/2012 10:14 AM, philby john wrote:
    > From: Philby John<pjohn@mvista.com>
    > Date: Mon, 9 Apr 2012 19:09:51 +0530
    > Subject: [PATCH] sil3531: has no PM capability, remove support.
    >
    > SATA sil3531 does not support Power Management Capability and
    > as per the manual Bit [31:27] is hardwired to 00h.
    > Otherwise, when the device goes into suspend/resume the Power
    > Management Control + Status registers are accessed and the
    > arch specific readl()/__raw_readl() calls block indefinitely.
    >
    > This patch sets the PCI_DEV_FLAGS_NO_D3 flag by which the if
    > condition in pci_set_power_state() evaluates to true and
    > pci_raw_set_power_state() functions are not executed.
    >
    > Signed-off-by: Philby John<pjohn@mvista.com>
    > Signed-off-by: Johnny Chiang<Johnny.Chiang@caviumnetworks.com>
    > ---
    > drivers/pci/pci.c | 1 +
    > 1 files changed, 1 insertions(+), 0 deletions(-)
    >
    > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
    > index 8156744..129120d 100644
    > --- a/drivers/pci/pci.c
    > +++ b/drivers/pci/pci.c
    > @@ -1863,6 +1863,7 @@ void pci_pm_init(struct pci_dev *dev)
    > pci_pme_active(dev, false);
    > } else {
    > dev->pme_support = 0;
    > + dev->dev_flags |= PCI_DEV_FLAGS_NO_D3;

    This patch applies to -every- piece of PCI hardware out there, not just
    the sil3531...

    Jeff






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