[Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218686

--- Comment #83 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
@al0uette@outlook.com:

Very interesting observation.  I did double check the ACPI spec and found this.

'''
Starting with ACPI Specification 6.2, all _CPC registers can be in PCC, System
Memory, System IO, or Functional Fixed Hardware address spaces. OSPM support
for this more flexible register space scheme is indicated by the “Flexible
Address Space for CPPC Registers” _OSC bit.
'''

So yes I do think this 'direction' is OK to go, but it probably needs an extra
check on the ACPI 6.2 version.  Something like this:

if (acpi_gbl_FADT.header.revision > 6 || 
   (acpi_gbl_FADT.header.revision == 6 && acpi_gbl_FADT.minor_revision >= 2))

Can you please spin your patch to add that and a proper commit message and then
post it to the linux-acpi mailing list?

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