For each detected ACPI Processor object (ACPI0007), search its device handle for CPPC specific tables (i.e. _CPC) and extract CPU specific performance capabilites.
Signed-off-by: Ashwin Chaugule ashwin.chaugule@linaro.org --- drivers/acpi/processor_driver.c | 4 ++++ include/acpi/processor.h | 9 +++++++++ 2 files changed, 13 insertions(+)
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index f61c09b..8554496 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -245,6 +245,10 @@ static int __acpi_processor_start(struct acpi_device *device) if (pr->flags.need_hotplug_init) return 0;
+ result = acpi_cppc_processor_probe(pr); + if (result) + return -ENODEV; + if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) acpi_processor_power_init(pr);
diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 659edd6..0b51117 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -339,6 +339,15 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id); int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id); int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
+#ifdef CONFIG_ACPI_CPPC +extern int acpi_cppc_processor_probe(struct acpi_processor *pr); +#else +static inline int acpi_cppc_processor_probe(struct acpi_processor *pr) +{ + return 0; +} +#endif /* CONFIG_ACPI_CPPC */ + /* in processor_pdc.c */ void acpi_processor_set_pdc(acpi_handle handle);