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ACPI: bus: Set CPPC _OSC bits for all and when CPPC_LIB is supported 

The _OSC method allows the OS and firmware to communicate about
supported features/capabitlities. It also allows the OS to take
control of some features.

In ACPI 6.4, s6.2.11.2 Platform-Wide OSPM Capabilities, the CPPC
(resp. v2) bit should be set by the OS if it 'supports controlling
processor performance via the interfaces described in the _CPC
object'.

The OS supports CPPC and parses the _CPC object only if
CONFIG_ACPI_CPPC_LIB is set. Replace the x86 specific
boot_cpu_has(X86_FEATURE_HWP) dynamic check with an arch
generic CONFIG_ACPI_CPPC_LIB build-time check.

Note:
CONFIG_X86_INTEL_PSTATE selects CONFIG_ACPI_CPPC_LIB.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Pierre Gondois 2022-05-18 11:08:58 +02:00 committed by Rafael J. Wysocki
parent 0651ab90e4
commit 72f2ecb7ec
1 changed files with 8 additions and 8 deletions
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16
drivers/acpi/bus.c
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@ -329,10 +329,11 @@ static void acpi_bus_osc_negotiate_platform_control(void)
#endif
#ifdef CONFIG_X86
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
if (boot_cpu_has(X86_FEATURE_HWP)) {
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
}
#endif
#ifdef CONFIG_ACPI_CPPC_LIB
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
#endif
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
@ -357,10 +358,9 @@ static void acpi_bus_osc_negotiate_platform_control(void)
return;
}
#ifdef CONFIG_X86
if (boot_cpu_has(X86_FEATURE_HWP))
osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
(OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
#ifdef CONFIG_ACPI_CPPC_LIB
osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
(OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
#endif
/*