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

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Date: Fri, 9 Feb 2024 12:11:11 +0100
From: Pierre Gondois <pierre.gondois@....com>
To: Sunil V L <sunilvl@...tanamicro.com>, linux-riscv@...ts.infradead.org,
 linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Anup Patel <apatel@...tanamicro.com>, Albert Ou <aou@...s.berkeley.edu>,
 "Rafael J . Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Atish Kumar Patra <atishp@...osinc.com>,
 Conor Dooley <conor.dooley@...rochip.com>,
 Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Andrew Jones <ajones@...tanamicro.com>,
 Len Brown <lenb@...nel.org>, Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq
 support

The code looks good to me, so FWIW:
Reviewed-by: Pierre Gondois <pierre.gondois@....com>

+Sudeep as this touches cppc/arm in case he didn't see the patches

On 2/8/24 04:44, Sunil V L 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
>