[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 #73 from Chema (chemasanchezgarabito@gmail.com) ---
Also I see that in the kernel logs when booting it says the following:


☁  ~  sudo dmesg | grep CPPC
[    1.565705] ACPI CPPC: Parsed CPC struct for CPU: 0
[    1.565845] ACPI CPPC: Parsed CPC struct for CPU: 1
[    1.565928] ACPI CPPC: Parsed CPC struct for CPU: 2
[    1.566022] ACPI CPPC: Parsed CPC struct for CPU: 3
[    1.566136] ACPI CPPC: Parsed CPC struct for CPU: 4
[    1.566246] ACPI CPPC: Parsed CPC struct for CPU: 5
[    1.566365] ACPI CPPC: Parsed CPC struct for CPU: 6
[    1.566476] ACPI CPPC: Parsed CPC struct for CPU: 7
[    1.566566] ACPI CPPC: Parsed CPC struct for CPU: 8
[    1.566651] ACPI CPPC: Parsed CPC struct for CPU: 9
[    1.566736] ACPI CPPC: Parsed CPC struct for CPU: 10
[    1.566844] ACPI CPPC: Parsed CPC struct for CPU: 11
[    1.566952] ACPI CPPC: Parsed CPC struct for CPU: 12
[    1.567067] ACPI CPPC: Parsed CPC struct for CPU: 13
[    1.567191] ACPI CPPC: Parsed CPC struct for CPU: 14
[    1.567341] ACPI CPPC: Parsed CPC struct for CPU: 15
[    1.585000] amd_pstate: AMD CPPC shared memory based functionality is
supported
[    1.586011] ACPI CPPC: _CPC in PCC is not supported
[    1.586134] ACPI CPPC: _CPC in PCC is not supported
[    1.586204] ACPI CPPC: _CPC in PCC is not supported
[    1.586230] ACPI CPPC: _CPC in PCC is not supported
[    1.586275] ACPI CPPC: _CPC in PCC is not supported
[    1.586302] ACPI CPPC: _CPC in PCC is not supported
[    1.586347] ACPI CPPC: _CPC in PCC is not supported
[    1.586376] ACPI CPPC: _CPC in PCC is not supported
[    1.586412] ACPI CPPC: _CPC in PCC is not supported
[    1.586469] ACPI CPPC: _CPC in PCC is not supported
[    1.586494] ACPI CPPC: _CPC in PCC is not supported
[    1.586530] ACPI CPPC: _CPC in PCC is not supported
[    1.586579] ACPI CPPC: _CPC in PCC is not supported
[    1.586616] ACPI CPPC: _CPC in PCC is not supported
[    1.586644] ACPI CPPC: _CPC in PCC is not supported
[    1.586669] ACPI CPPC: _CPC in PCC is not supported


And that logs are thrown in:

    - L879 cppc_acpi.c
    - L1491 cppc_api.c

And first one means that 
/**
 * acpi_cppc_processor_probe - Search for per CPU _CPC objects.
 * @pr: Ptr to acpi_processor containing this CPU's logical ID.
 *
 *      Return: 0 for success or negative value for err.
 */
int acpi_cppc_processor_probe(struct acpi_processor *pr)
is working correctly

But then "int cppc_set_epp_perf" throwing because of "if
(CPC_IN_PCC(epp_set_reg) || CPC_IN_PCC(auto_sel_reg))" is not met

So can correclty read the CPC object of ACPI but not write with PCC in the CPC
obj?

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