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

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Message-ID: <20240213061516.kbvwdyabw2p6egwr@vireshk-i7>
Date: Tue, 13 Feb 2024 11:45:16 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Sunil V L <sunilvl@...tanamicro.com>, linux-riscv@...ts.infradead.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	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 12-02-24, 16:24, Rafael J. Wysocki wrote:
> 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.

I have provided my Ack over the cpufreq patch. Thanks.

-- 
viresh