ACPI: Set _PSD ACPI_PDC_SMP_T_SWCOORD

The ACPI_PDC_SMP_T_SWCOORD bit is set by and OS that is capable of
native ACPI throttling software coordination for mutli-processors
using the _TSD information.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/ia64/kernel/acpi-processor.c b/arch/ia64/kernel/acpi-processor.c
index 5a216c019924..cbe6cee5a550 100644
--- a/arch/ia64/kernel/acpi-processor.c
+++ b/arch/ia64/kernel/acpi-processor.c
@@ -45,6 +45,12 @@ static void init_intel_pdc(struct acpi_processor *pr)
         buf[0] = ACPI_PDC_REVISION_ID;
         buf[1] = 1;
         buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
+        /*
+         * The default of PDC_SMP_T_SWCOORD bit is set for IA64 cpu so
+         * that OSPM is capable of native ACPI throttling software
+         * coordination using BIOS supplied _TSD info.
+         */
+        buf[2] |= ACPI_PDC_SMP_T_SWCOORD;
 
         obj->type = ACPI_TYPE_BUFFER;
         obj->buffer.length = 12;