linux-kernel - Re: [PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq support

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Date: Mon, 12 Feb 2024 16:24:17 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Sunil V L <sunilvl@...tanamicro.com>
Cc: linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, "Rafael J . Wysocki" <rafael@...nel.org>, 
	Len Brown <lenb@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Viresh Kumar <viresh.kumar@...aro.org>, Conor Dooley <conor.dooley@...rochip.com>, 
	Andrew Jones <ajones@...tanamicro.com>, Atish Kumar Patra <atishp@...osinc.com>, 
	Anup Patel <apatel@...tanamicro.com>
Subject: Re: [PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq support

On Thu, Feb 8, 2024 at 4:44 AM Sunil V L <sunilvl@...tanamicro.com> wrote:
>
> This series enables the support for "Collaborative Processor Performance
> Control (CPPC) on ACPI based RISC-V platforms. It depends on the
> encoding of CPPC registers as defined in RISC-V FFH spec [2].
>
> CPPC 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#collaborative-processor-performance-control
> [2] - https://github.com/riscv-non-isa/riscv-acpi-ffh/releases/download/v1.0.0/riscv-ffh.pdf
>
> The series is based on the LPI support series.
> Based-on: 20240118062930.245937-1-sunilvl@...tanamicro.com
> (https://lore.kernel.org/lkml/20240118062930.245937-1-sunilvl@ventanamicro.com/)
>
> Sunil V L (3):
>   ACPI: RISC-V: Add CPPC driver
>   cpufreq: Move CPPC configs to common Kconfig and add RISC-V
>   RISC-V: defconfig: Enable CONFIG_ACPI_CPPC_CPUFREQ
>
>  arch/riscv/configs/defconfig |   1 +
>  drivers/acpi/riscv/Makefile  |   1 +
>  drivers/acpi/riscv/cppc.c    | 157 +++++++++++++++++++++++++++++++++++
>  drivers/cpufreq/Kconfig      |  29 +++++++
>  drivers/cpufreq/Kconfig.arm  |  26 ------
>  5 files changed, 188 insertions(+), 26 deletions(-)
>  create mode 100644 drivers/acpi/riscv/cppc.c
>
> --

This is fine with me, so

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

and it would be good to ask Viresh (who maintains the CPPC cpufreq
driver) for an ACK.

Thanks!