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

[net-next-2.6.git] / drivers / pci / quirks.c

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 89ed181cd90cd9cd68506a212eb423ba60f9c8e2..857ae01734a66156c8abb92335be91cc674964a0 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -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
  */