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authorLen Brown <len.brown@intel.com>2010-09-25 05:02:27 +0400
committerLen Brown <len.brown@intel.com>2010-09-25 05:09:19 +0400
commit4731fdcf6f7bdab3e369a3f844d4ea4d4017284d (patch)
tree0073886d3be72f38143f9d1909cc4204dd64c03f /drivers/pci/quirks.c
parent2422084a94fcd5038406261b331672a13c92c050 (diff)
downloadlinux-4731fdcf6f7bdab3e369a3f844d4ea4d4017284d.tar.xz
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: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 89ed181cd90c..857ae01734a6 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -163,6 +163,26 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_2, quirk_isa_d
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)