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intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3 boot hang

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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>
This commit is contained in:
Len Brown 2010-09-24 21:02:27 -04:00
parent 2422084a94
commit 4731fdcf6f
1 changed files with 20 additions and 0 deletions
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20
drivers/pci/quirks.c
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@ -162,6 +162,26 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_1, quirk_isa_d
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_2, quirk_isa_dma_hangs);
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
*/