For each detected ACPI Processor object (ACPI0007), search its device handle for CPPC specific tables (i.e. _CPC) and extract CPU specific performance capabilities.
Signed-off-by: Ashwin Chaugule ashwin.chaugule@linaro.org Reviewed-by: Al Stone al.stone@linaro.org --- drivers/acpi/processor_driver.c | 6 ++++++ include/acpi/processor.h | 14 ++++++++++++++ 2 files changed, 20 insertions(+)
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 16d44ad..6519c22 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -246,6 +246,10 @@ 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);
@@ -291,6 +295,8 @@ static int acpi_processor_stop(struct device *dev)
acpi_pss_perf_exit(pr, device);
+ acpi_cppc_processor_exit(pr); + return 0; }
diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 2c4e7a9..43ee1bf 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -314,6 +314,20 @@ 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_LIB +extern int acpi_cppc_processor_probe(struct acpi_processor *pr); +extern void acpi_cppc_processor_exit(struct acpi_processor *pr); +#else +static inline int acpi_cppc_processor_probe(struct acpi_processor *pr) +{ + return 0; +} +static inline void acpi_cppc_processor_exit(struct acpi_processor *pr) +{ + return; +} +#endif /* CONFIG_ACPI_CPPC_LIB */ + /* in processor_pdc.c */ void acpi_processor_set_pdc(acpi_handle handle);