diff options
Diffstat (limited to 'arch/x86_64/kernel/io_apic.c')
| -rw-r--r-- | arch/x86_64/kernel/io_apic.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index 77b4c608cca0..9cc7031b7151 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -271,6 +271,18 @@ __setup("enable_8254_timer", setup_enable_8254_timer); #include <linux/pci_ids.h> #include <linux/pci.h> + +#ifdef CONFIG_ACPI + +static int nvidia_hpet_detected __initdata; + +static int __init nvidia_hpet_check(unsigned long phys, unsigned long size) +{ + nvidia_hpet_detected = 1; + return 0; +} +#endif + /* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC off. Check for an Nvidia or VIA PCI bridge and turn it off. Use pci direct infrastructure because this runs before the PCI subsystem. @@ -317,11 +329,19 @@ void __init check_ioapic(void) return; case PCI_VENDOR_ID_NVIDIA: #ifdef CONFIG_ACPI - /* All timer overrides on Nvidia - seem to be wrong. Skip them. */ - acpi_skip_timer_override = 1; - printk(KERN_INFO - "Nvidia board detected. Ignoring ACPI timer override.\n"); + /* + * All timer overrides on Nvidia are + * wrong unless HPET is enabled. + */ + nvidia_hpet_detected = 0; + acpi_table_parse(ACPI_HPET, + nvidia_hpet_check); + if (nvidia_hpet_detected == 0) { + acpi_skip_timer_override = 1; + printk(KERN_INFO "Nvidia board " + "detected. Ignoring ACPI " + "timer override.\n"); + } #endif /* RED-PEN skip them on mptables too? */ return; @@ -1777,6 +1797,8 @@ static inline void unlock_ExtINT_logic(void) spin_unlock_irqrestore(&ioapic_lock, flags); } +int timer_uses_ioapic_pin_0; + /* * This code may look a bit paranoid, but it's supposed to cooperate with * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ @@ -1814,6 +1836,9 @@ static inline void check_timer(void) pin2 = ioapic_i8259.pin; apic2 = ioapic_i8259.apic; + if (pin1 == 0) + timer_uses_ioapic_pin_0 = 1; + apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n", vector, apic1, pin1, apic2, pin2); |