Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH v3 4/5] ACPI / processor_idle : introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE | Date | Tue, 16 Feb 2016 21:18:36 +0100 |
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On Wednesday, December 02, 2015 02:10:45 PM Sudeep Holla 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)
No.
The way it really should work is to check if the firmware supports LPI (and what kind of it) and try to use _CST if LPI is not supported.
If LPI is supported by the firmware, use it if the LPI objects are present as expected or fall back to using _CST otherwise.
This way it all should work without any new Kconfig options.
Thanks, Rafael
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