On 24/09/15 11:31, Ashwin Chaugule wrote:
Hi Sudeep, On 16 September 2015 at 09:59, Sudeep Holla <sudeep.holla@xxxxxxx> wrote:ACPI 6.0 adds a new method to specify the CPU idle states(C-states) called Low Power Idle(LPI) states. Since new architectures like ARM64 use only LPIs, introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE to encapsulate all the code supporting the old style C-states(_CST) This patch will help to extend the processor_idle module to support LPI. Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
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diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7aef2d52daa0..173075c48df8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -34,6 +34,7 @@ config X86 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO + select ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE if ACPI select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT select ARCH_SUPPORTS_INT128 if X86_64 diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 5d1015c26ff4..1eb0b8a84a65 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -48,6 +48,9 @@ config ACPI_LEGACY_TABLES_LOOKUP config ARCH_MIGHT_HAVE_ACPI_PDC bool +config ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE + bool + config ACPI_GENERIC_GSI boolCan't this be auto selected under ACPI_PROCESSOR_IDLE if X86 || IA64 instead?
It can be done. The idea was to have ACPI_PROCESSOR_IDLE selected on both x86 and ARM64. processor_idle driver will support both _CST and _LPI 1. to avoid some code duplication 2. for easy enabling of _LPI on x86 if needed in future Regards, Sudeep -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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