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| author | Mario Limonciello <mario.limonciello@amd.com> | 2022-07-13 12:53:46 -0500 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-07-13 21:13:14 +0200 |
| commit | fbd74d16890b9f5d08ea69b5282b123c894f8860 (patch) | |
| tree | 5a6cce37154fae274c1a7b04e15dfd3268058e0c /drivers/char/nwbutton.h | |
| parent | 32346491ddf24599decca06190ebca03ff9de7f8 (diff) | |
| download | linux-fbd74d16890b9f5d08ea69b5282b123c894f8860.tar.bz2 | |
ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory
When commit 72f2ecb7ece7 ("ACPI: bus: Set CPPC _OSC bits for all
and when CPPC_LIB is supported") was introduced, we found collateral
damage that a number of AMD systems that supported CPPC but
didn't advertise support in _OSC stopped having a functional
amd-pstate driver. The _OSC was only enforced on Intel systems at that
time.
This was fixed for the MSR based designs by commit 8b356e536e69f
("ACPI: CPPC: Don't require _OSC if X86_FEATURE_CPPC is supported")
but some shared memory based designs also support CPPC but haven't
advertised support in the _OSC. Add support for those designs as well by
hardcoding the list of systems.
Fixes: 72f2ecb7ece7 ("ACPI: bus: Set CPPC _OSC bits for all and when CPPC_LIB is supported")
Fixes: 8b356e536e69f ("ACPI: CPPC: Don't require _OSC if X86_FEATURE_CPPC is supported")
Link: https://lore.kernel.org/all/3559249.JlDtxWtqDm@natalenko.name/
Cc: 5.18+ <stable@vger.kernel.org> # 5.18+
Reported-and-tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/char/nwbutton.h')
0 files changed, 0 insertions, 0 deletions