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    Subject[55/66] intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3 boot hang
    2.6.32-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Len Brown <len.brown@intel.com>

    commit 4731fdcf6f7bdab3e369a3f844d4ea4d4017284d upstream.

    When the Lenovo Ideapad S10-3 is booted with HT enabled,
    it hits a boot hang in the intel_idle driver.

    This occurs when entering ATM-C4 for the first time,
    unless BM_STS is first cleared.

    acpi_idle doesn't see this because it first checks
    and clears BM_STS, but it would hit the same hang
    if that check were disabled.

    http://bugs.meego.com/show_bug.cgi?id=7093
    https://bugs.launchpad.net/ubuntu/+source/linux/+bug/634702

    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/pci/quirks.c | 20 ++++++++++++++++++++
    1 file changed, 20 insertions(+)

    --- a/drivers/pci/quirks.c
    +++ b/drivers/pci/quirks.c
    @@ -155,6 +155,26 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NE
    DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_3, quirk_isa_dma_hangs);

    /*
    + * Intel NM10 "TigerPoint" LPC PM1a_STS.BM_STS must be clear
    + * for some HT machines to use C4 w/o hanging.
    + */
    +static void __devinit quirk_tigerpoint_bm_sts(struct pci_dev *dev)
    +{
    + u32 pmbase;
    + u16 pm1a;
    +
    + pci_read_config_dword(dev, 0x40, &pmbase);
    + pmbase = pmbase & 0xff80;
    + pm1a = inw(pmbase);
    +
    + if (pm1a & 0x10) {
    + dev_info(&dev->dev, FW_BUG "TigerPoint LPC.BM_STS cleared\n");
    + outw(0x10, pmbase);
    + }
    +}
    +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TGP_LPC, quirk_tigerpoint_bm_sts);
    +
    +/*
    * Chipsets where PCI->PCI transfers vanish or hang
    */
    static void __devinit quirk_nopcipci(struct pci_dev *dev)



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