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linux/arch/x86/kernel/acpi
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Mario Limonciello fbd74d1689 ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory 
When commit 72f2ecb7ec ("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 8b356e536e
("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: 72f2ecb7ec ("ACPI: bus: Set CPPC _OSC bits for all and when CPPC_LIB is supported")
Fixes: 8b356e536e ("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>
2022-07-13 21:13:14 +02:00
..
apei.c x86/mce, cper: Pass x86 CPER through the MCA handling chain 2020-11-21 12:05:41 +01:00
boot.c Power management updates for 5.19-rc1 2022-05-24 16:04:25 -07:00
cppc.c ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory 2022-07-13 21:13:14 +02:00
cstate.c x86: ACPI: cstate: Optimize C3 entry on AMD CPUs 2021-10-01 20:44:31 +02:00
Makefile x86/ACPI: CPPC: Rename cppc_msr.c to cppc.c 2022-03-08 19:16:43 +01:00
sleep.c PM: hibernate: Honour ACPI hardware signature by default for virtual guests 2022-03-16 19:29:32 +01:00
sleep.h x86/acpi: make "asmlinkage" part first thing in the function definition 2020-03-14 10:29:07 +01:00
wakeup_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
wakeup_64.S kasan: remove redundant config option 2021-04-16 16:10:36 -07:00