[edk2-devel] [PATCH v2 0/3] Platform/ARM: Enable _CPC/_PSD generation on Juno-r2

["PierreGondois" <pierre.gondois@arm.com>]

From: Pierre Gondois <pierre.gondois@arm.com>

v1:
- https://edk2.groups.io/g/devel/message/104127
v2:
- Rebase patches on latest version.
- Correct frequency values which were advertised in KHz
  when CPPC spec require them to be in MHz.

A recent patchset [1] allows the generation of _PSD/_CPC ACPI objects by
querying the relevant information through the SCMI protocol.
- The _PSD object describes to which performance domain a CPU belongs.
  CPUs in the same performance domain have the same frequency.
- The _CPC object describes an interface to control the performance level
  of a CPU (i.e. its frequency).

Demonstrate the _PSD/_CPC generation functionality on Juno-r2 platforms.

In order to work, the SCP must describe performance levels on a unified
scale (i.e. not as frequencies). The following performance level values
where used for testing:
- little CPUs OPPs: [181, 322, 383] * 1000
- big CPUs OPPs: [512, 833, 1024] * 1024

The SCP should also:
- have fast channel enabled
- set the `approximate_level` feature to allow performance level requests
  in between OPP leveles.

[1] https://edk2.groups.io/g/devel/message/110036

Pierre Gondois (3):
  Platform/ARM: Juno: Fix typo
  Platform/ARM: Juno: Generate _PSD objects
  Platform/ARM: Juno: Generate _CPC objects for JunoR2

 .../ConfigurationManager.c                    | 333 +++++++++++++++++-
 .../ConfigurationManager.h                    |  25 +-
 .../ConfigurationManagerDxe.inf               |   1 +
 3 files changed, 346 insertions(+), 13 deletions(-)

-- 
2.25.1



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