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Commit 4731fdcf authored by Len Brown's avatar Len Brown
Browse files

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

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: default avatarLen Brown <len.brown@intel.com>
parent 2422084a

drivers/pci/quirks.c

+20 −0
Original line number Diff line number Diff line
@@ -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

 */