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/Kconfig | 2 +- drivers/acpi/processor_driver.c | 4 ++++ include/acpi/processor.h | 9 +++++++++ 3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 937c7f0..a600192 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -209,7 +209,7 @@ config ACPI_CPPC
config ACPI_PROCESSOR tristate "Processor" - depends on X86 || IA64 + depends on X86 || IA64 || ARM64 default y help This driver adds support for the ACPI Processor package. It is required diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 64aa638..ea9c93b 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);
diff --git a/include/acpi/processor.h b/include/acpi/processor.h index b76d05b..c48684b 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -328,6 +328,15 @@ 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);