ACPI: CPPC: Implement support for SystemIO registers

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According to the ACPI v6.2 (and later) specification, SystemIO can be
used for _CPC registers. This teaches cppc_acpi how to handle such
registers.

This patch was tested using the amd_pstate driver on my Zephyrus G15
(model GA503QS) using the current version 410 BIOS, which uses
a SystemIO register for the HighestPerformance element in _CPC.

Signed-off-by: Steven Noonan <steven@valvesoftware.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Steven Noonan 2021-12-24 09:04:57 +08:00 • committed by Rafael J. Wysocki

parent 89aa94b4a2

commit a2c8f92bea

1 changed files with 49 additions and 3 deletions

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drivers/acpi/cppc_acpi.c

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