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

Applied to Maverick linux master. I intend for this patch to be
included in the day 0 kernel upload, See LP Bug 647071.

Thanks,
Leann

On Mon, 2010-09-27 at 18:24 +0800, Ike Panhc wrote:
> From: Len Brown <len.brown@intel.com>
>
> 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
> BugLink: http://launchpad.net/bugs/634702
>
> Signed-off-by: Len Brown <len.brown@intel.com>
> Signed-off-by: Ike Panhc <ike.pan@canonical.com>
> ---
> 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 e28524e..2a73ceb 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -150,6 +150,26 @@ 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
");
> + 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)
> --
> 1.7.1
>
>



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