[ACPI] update /proc/acpi/processor/*/power even if only C1 support

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 26 insertions, 7 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index ff64d333e95f..79d5ca3066c6 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -519,6 +519,29 @@ static int acpi_processor_get_power_info_fadt (struct acpi_processor *pr)
 }
 
 
+static int acpi_processor_get_power_info_default_c1 (struct acpi_processor *pr)
+{
+        int i;
+
+        ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1");
+
+        for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
+                memset(pr->power.states, 0, sizeof(struct acpi_processor_cx));
+
+        /* if info is obtained from pblk/fadt, type equals state */
+        pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
+        pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
+        pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
+
+        /* the C0 state only exists as a filler in our array,
+         * and all processors need to support C1 */
+        pr->power.states[ACPI_STATE_C0].valid = 1;
+        pr->power.states[ACPI_STATE_C1].valid = 1;
+
+        return_VALUE(0);
+}
+
+
 static int acpi_processor_get_power_info_cst (struct acpi_processor *pr)
 {
         acpi_status             status = 0;
@@ -787,10 +810,7 @@ static int acpi_processor_get_power_info (
         if ((result) || (acpi_processor_power_verify(pr) < 2)) {
                 result = acpi_processor_get_power_info_fadt(pr);
                 if (result)
-                        return_VALUE(result);
-
-                if (acpi_processor_power_verify(pr) < 2)
-                        return_VALUE(-ENODEV);
+                        result = acpi_processor_get_power_info_default_c1(pr);
         }
 
         /*
@@ -810,11 +830,10 @@ static int acpi_processor_get_power_info (
          * CPU as being "idle manageable"
          */
         for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
-                if (pr->power.states[i].valid)
+                if (pr->power.states[i].valid) {
                         pr->power.count = i;
-                if ((pr->power.states[i].valid) &&
-                    (pr->power.states[i].type >= ACPI_STATE_C2))
                         pr->flags.power = 1;
+                }
         }
 
         return_VALUE(0);