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RISC-V: ACPI: Add LPI support #465

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RISC-V: ACPI: Add LPI support #465

wants to merge 3 commits into from

Commits on Feb 22, 2024

  1. cpuidle: RISC-V: Move few functions to arch/riscv 

    To support ACPI Low Power Idle (LPI), few functions are required which
are currently static functions in the DT based cpuidle driver. Hence,
move them under arch/riscv so that ACPI driver also can use them. Since
they are no longer static functions, append "riscv_" prefix to the
function name.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @vlsunil
    vlsunil authored and Björn Töpel committed Feb 22, 2024
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  2. ACPI: RISC-V: Add LPI driver 

    Enable Low Power Idle (LPI) based cpuidle driver for RISC-V platforms.
It depends on SBI HSM calls for idle state transitions.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @vlsunil
    vlsunil authored and Björn Töpel committed Feb 22, 2024
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  3. ACPI: Enable ACPI_PROCESSOR for RISC-V 

    The ACPI processor driver is not currently enabled for RISC-V.
This is required to enable CPU related functionalities like
LPI and CPPC. Hence, enable ACPI_PROCESSOR for RISC-V.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @vlsunil
    vlsunil authored and Björn Töpel committed Feb 22, 2024
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