diff options
| author | Len Brown <len.brown@intel.com> | 2010-09-24 21:02:27 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-21 12:43:24 -0700 |
| commit | 05f7676dc3559c2b9061fda4e44c085a8d32fb05 (patch) | |
| tree | 4bbb1cb7ed16206b66e204efc0a7877d6dbb1c57 | |
| parent | 91b3824071a9dc7ca4bb8c41bda045e223837564 (diff) | |
intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3 boot hang
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>
| -rw-r--r-- | drivers/pci/quirks.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 197e38fd6ce..a8dbf2ea694 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -155,6 +155,26 @@ 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) |