diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | arch/i386/kernel/apic.c | 10 | ||||
| -rw-r--r-- | drivers/acpi/processor_idle.c | 3 | ||||
| -rw-r--r-- | include/asm-i386/apic.h | 1 |
4 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index e39ab0c99fbb..09640a8f7ceb 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -780,6 +780,9 @@ and is between 256 and 4096 characters. It is defined in the file lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it. + lapic_timer_c2_ok [IA-32,APIC] trust the local apic timer in + C2 power state. + lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip Format: addr:<io>,irq:<irq> diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c index 244c3fe9b8c3..e88415282a6f 100644 --- a/arch/i386/kernel/apic.c +++ b/arch/i386/kernel/apic.c @@ -64,6 +64,9 @@ static int enable_local_apic __initdata = 0; static int local_apic_timer_verify_ok; /* Disable local APIC timer from the kernel commandline or via dmi quirk */ static int local_apic_timer_disabled; +/* Local APIC timer works in C2 */ +int local_apic_timer_c2_ok; +EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); /* * Debug level, exported for io_apic.c @@ -1232,6 +1235,13 @@ static int __init parse_disable_lapic_timer(char *arg) } early_param("nolapic_timer", parse_disable_lapic_timer); +static int __init parse_lapic_timer_c2_ok(char *arg) +{ + local_apic_timer_c2_ok = 1; + return 0; +} +early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); + static int __init apic_set_verbosity(char *str) { if (strcmp("debug", str) == 0) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 60773005b8af..cdf78943af4d 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -268,6 +268,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr, struct acpi_processor_cx *cx) { struct acpi_processor_power *pwr = &pr->power; + u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; /* * Check, if one of the previous states already marked the lapic @@ -276,7 +277,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr, if (pwr->timer_broadcast_on_state < state) return; - if (cx->type >= ACPI_STATE_C2) + if (cx->type >= type) pr->power.timer_broadcast_on_state = state; } diff --git a/include/asm-i386/apic.h b/include/asm-i386/apic.h index cc6b1652249a..a19810a08ae9 100644 --- a/include/asm-i386/apic.h +++ b/include/asm-i386/apic.h @@ -117,6 +117,7 @@ extern void enable_NMI_through_LVT0 (void * dummy); #define ARCH_APICTIMER_STOPS_ON_C3 1 extern int timer_over_8254; +extern int local_apic_timer_c2_ok; #else /* !CONFIG_X86_LOCAL_APIC */ static inline void lapic_shutdown(void) { } |