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[-next,0/2] RISC-V: ACPI: Add LPI support

Message ID 20240111093058.121838-1-sunilvl@ventanamicro.com
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Series RISC-V: ACPI: Add LPI support | expand

Message

Sunil V L Jan. 11, 2024, 9:30 a.m. UTC 
This series adds support for Low Power Idle (LPI) on ACPI based
platforms. 

LPI is described in the ACPI spec [1]. RISC-V FFH spec required to
enable this is available at [2].

[1] - https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html#lpi-low-power-idle-states 
[2] - https://github.com/riscv-non-isa/riscv-acpi-ffh/releases/download/v/riscv-ffh.pdf

Sunil V L (2):
  ACPI: Enable ACPI_PROCESSOR for RISC-V
  cpuidle: RISC-V: Add ACPI LPI support

 drivers/acpi/Kconfig                |  2 +-
 drivers/cpuidle/cpuidle-riscv-sbi.c | 78 +++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+), 1 deletion(-)

Comments

Sudeep Holla Jan. 11, 2024, 12:16 p.m. UTC | #1 
On Thu, Jan 11, 2024 at 11:00:12AM +0100, Andrew Jones wrote:

[...]

> Also, interestingly, it looks like this ancient line
>
>  obj-$(CONFIG_ACPI_PROCESSOR)    += processor.o
>
> in drivers/acpi/Makefile should be removed,

No

> since there's no drivers/acpi/processor.c file.

Correct, but ..

> I guess the make process silently filters object files which don't have
> corresponding source files?

May be, but I doubt if that is the case here.

processor.o is just aggregation of all processor_*.o and this will be
the processor.ko when built as a module.

--
Regards,
Sudeep