diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/quirks.c | 37 |
2 files changed, 38 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index b2361667839f..a13d69b2217d 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -422,7 +422,8 @@ and is between 256 and 4096 characters. It is defined in the file hpet= [X86-32,HPET] option to control HPET usage Format: { enable (default) | disable | force } disable: disable HPET and use PIT instead - force: allow force enabled of undocumented chips (ICH4, VIA) + force: allow force enabled of undocumented chips (ICH4, + VIA, nVidia) com20020= [HW,NET] ARCnet - COM20020 chipset Format: diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c index a4ce1911efdf..5317c40efd13 100644 --- a/arch/x86/kernel/quirks.c +++ b/arch/x86/kernel/quirks.c @@ -60,7 +60,8 @@ static enum { NONE_FORCE_HPET_RESUME, OLD_ICH_FORCE_HPET_RESUME, ICH_FORCE_HPET_RESUME, - VT8237_FORCE_HPET_RESUME + VT8237_FORCE_HPET_RESUME, + NVIDIA_FORCE_HPET_RESUME, } force_hpet_resume_type; static void __iomem *rcba_base; @@ -321,6 +322,37 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237, vt8237_force_enable_hpet); +/* + * Undocumented chipset feature taken from LinuxBIOS. + */ +static void nvidia_force_hpet_resume(void) +{ + pci_write_config_dword(cached_dev, 0x44, 0xfed00001); + printk(KERN_DEBUG "Force enabled HPET at resume\n"); +} + +static void nvidia_force_enable_hpet(struct pci_dev *dev) +{ + u32 uninitialized_var(val); + + if (!hpet_force_user || hpet_address || force_hpet_address) + return; + + pci_write_config_dword(dev, 0x44, 0xfed00001); + pci_read_config_dword(dev, 0x44, &val); + force_hpet_address = val & 0xfffffffe; + force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME; + printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n", + force_hpet_address); + cached_dev = dev; + return; +} + +/* ISA Bridges */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050, + nvidia_force_enable_hpet); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051, + nvidia_force_enable_hpet); void force_hpet_resume(void) { @@ -334,6 +366,9 @@ void force_hpet_resume(void) case VT8237_FORCE_HPET_RESUME: return vt8237_force_hpet_resume(); + case NVIDIA_FORCE_HPET_RESUME: + return nvidia_force_hpet_resume(); + default: break; } |