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authorLen Brown <len.brown@intel.com>2010-03-08 14:07:30 -0500
committerLen Brown <len.brown@intel.com>2010-05-28 14:26:20 -0400
commit2671717265ae6e720a9ba5f13fbec3a718983b65 (patch)
tree16a3c688e297a9a69421640410f7140a6114a8e3 /drivers/acpi
parent02cf4f9808382af7265cafc33dc86ec5875526aa (diff)
intel_idle: native hardware cpuidle driver for latest Intel processors
This EXPERIMENTAL driver supersedes acpi_idle on Intel Atom Processors, Intel Core i3/i5/i7 Processors and associated Intel Xeon processors. It does not support the Intel Core2 processor or earlier. For kernels configured with ACPI, CONFIG_INTEL_IDLE=y allows intel_idle to probe before the ACPI processor driver. Booting with "intel_idle.max_cstate=0" disables intel_idle and the system will fall back on ACPI's "acpi_idle". Typical Linux distributions load ACPI processor module early, making CONFIG_INTEL_IDLE=m not easily useful on ACPI platforms. intel_idle probes all processors at module_init time. Processors that are hot-added later will be limited to using C1 in idle. Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_driver.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index deefa859174..b1034a9ada4 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -922,9 +922,13 @@ static int __init acpi_processor_init(void)
return -ENOMEM;
#endif
- if (!cpuidle_register_driver(&acpi_idle_driver))
+ if (!cpuidle_register_driver(&acpi_idle_driver)) {
printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
acpi_idle_driver.name);
+ } else {
+ printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s",
+ cpuidle_get_driver()->name);
+ }
result = acpi_bus_register_driver(&acpi_processor_driver);
if (result < 0)