From: Sumit Gupta <sumitg@nvidia.com>
To: <rafael@kernel.org>, <viresh.kumar@linaro.org>, <lenb@kernel.org>,
<pierre.gondois@arm.com>, <zhenglifeng1@huawei.com>,
<zhanjie9@hisilicon.com>, <mario.limonciello@amd.com>,
<saket.dumbre@intel.com>, <linux-acpi@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-pm@vger.kernel.org>,
<acpica-devel@lists.linux.dev>
Cc: <treding@nvidia.com>, <jonathanh@nvidia.com>, <vsethi@nvidia.com>,
<ksitaraman@nvidia.com>, <sanjayc@nvidia.com>, <bbasu@nvidia.com>,
<sumitg@nvidia.com>
Subject: [PATCH 0/2] ACPI: CPPC: Add CPPC v4 support (ACPI 6.6)
Date: Mon, 27 Apr 2026 10:48:21 +0530 [thread overview]
Message-ID: <20260427051823.280419-1-sumitg@nvidia.com> (raw)
Add initial kernel support for CPPC v4 (ACPI 6.6, Section 8.4.6),
which extends the _CPC package from 23 to 25 entries with two
optional fields:
- OSPM Nominal Performance (8.4.6.1.2.6): write-only register
used by OSPM to tell the platform what it considers nominal.
The platform classifies performance above this as boost and
below as throttle for power/thermal decisions.
- Resource Priority (8.4.6.1.2.7): Package of Resource Priority
Register Descriptor sub-packages. Full parsing is not yet
implemented; such entries are marked as unsupported.
Patch 1: Add v4 _CPC parsing - validate the 25-entry layout,
handle the Resource Priority package, and mark the two new
registers optional.
Patch 2: cppc_set_ospm_nominal_perf() API, write-only
acpi_cppc/ospm_nominal_perf sysfs attribute, and init to platform
nominal during cppc_cpufreq policy init.
Sumit Gupta (2):
ACPI: CPPC: Add support for CPPC v4
ACPI: CPPC: Add ospm_nominal_perf support
drivers/acpi/cppc_acpi.c | 66 ++++++++++++++++++++++++++++++----
drivers/cpufreq/cppc_cpufreq.c | 10 ++++++
include/acpi/cppc_acpi.h | 13 +++++--
3 files changed, 81 insertions(+), 8 deletions(-)
--
2.34.1
next reply other threads:[~2026-04-27 5:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 5:18 Sumit Gupta [this message]
2026-04-27 5:18 ` [PATCH 1/2] ACPI: CPPC: Add support for CPPC v4 Sumit Gupta
2026-04-27 7:06 ` zhenglifeng (A)
2026-04-27 8:04 ` Sumit Gupta
2026-04-27 5:18 ` [PATCH 2/2] ACPI: CPPC: Add ospm_nominal_perf support Sumit Gupta
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