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Date:   Wed, 18 May 2022 10:42:43 +0100
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Pierre Gondois <pierre.gondois@arm.com>
Cc:     linux-kernel@vger.kernel.org, Ionela.Voinescu@arm.com,
        dietmar.eggemann@arm.com, sudeep.holla@arm.com,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Robert Moore <robert.moore@intel.com>,
        linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
        devel@acpica.org
Subject: Re: [PATCH v2 1/5] ACPI: CPPC: Check _OSC for flexible address space
Message-ID: <20220518094243.6oxbdmf226jvqoef@viresh-thinkpad>
References: <20220518090901.2724518-1-pierre.gondois@arm.com>
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On 18-05-22, 11:08, Pierre Gondois wrote:
> ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
>   Starting with ACPI Specification 6.2, all _CPC registers can be in
>   PCC, System Memory, System IO, or Functional Fixed Hardware address
>   spaces. OSPM support for this more flexible register space scheme is
>   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit
> 
> Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
> - PCC or Functional Fixed Hardware address space if defined
> - SystemMemory address space (NULL register) if not defined
> 
> Add the corresponding _OSC bit and check it when parsing _CPC objects.
> 
> Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/acpi/bus.c       | 18 ++++++++++++++++++
>  drivers/acpi/cppc_acpi.c |  9 +++++++++
>  include/linux/acpi.h     |  2 ++
>  3 files changed, 29 insertions(+)

It would be much useful to get a cover letter for this series with
what you have changed since the previous version. It is almost
impossible to find that out otherwise.

-- 
viresh