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>
[...]
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
bool
Can'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
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