ACPI: Enable MSR (FixedHW) support for T-States

Add throttling control via MSR when T-states uses
the FixHW Control Status registers.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kernel/acpi/processor.c b/arch/x86/kernel/acpi/processor.c
index f63e5ff0aca1..a25db514c719 100644
--- a/arch/x86/kernel/acpi/processor.c
+++ b/arch/x86/kernel/acpi/processor.c
@@ -49,6 +49,9 @@ static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
         if (cpu_has(c, X86_FEATURE_EST))
                 buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
 
+        if (cpu_has(c, X86_FEATURE_ACPI))
+                buf[2] |= ACPI_PDC_T_FFH;
+
         obj->type = ACPI_TYPE_BUFFER;
         obj->buffer.length = 12;
         obj->buffer.pointer = (u8 *) buf;