2 files changed, 16 insertions, 2 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index b4749969c6b4..e98071a64810 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -64,7 +64,13 @@ static DEFINE_MUTEX(performance_mutex);
  * policy is adjusted accordingly.
  */
 
-static unsigned int ignore_ppc = 0;
+/* ignore_ppc:
+ * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
+ *       ignore _PPC
+ *  0 -> cpufreq low level drivers initialized -> consider _PPC values
+ *  1 -> ignore _PPC totally -> forced by user through boot param
+ */
+static unsigned int ignore_ppc = -1;
 module_param(ignore_ppc, uint, 0644);
 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
                  "limited by BIOS, this should help");
@@ -72,7 +78,7 @@ MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
 #define PPC_REGISTERED   1
 #define PPC_IN_USE       2
 
-static int acpi_processor_ppc_status = 0;
+static int acpi_processor_ppc_status;
 
 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
                                        unsigned long event, void *data)
@@ -81,6 +87,11 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
         struct acpi_processor *pr;
         unsigned int ppc = 0;
 
+        if (event == CPUFREQ_START && ignore_ppc <= 0) {
+                ignore_ppc = 0;
+                return 0;
+        }
+
         if (ignore_ppc)
                 return 0;
 
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 8d6a3ff02672..8a67f16987db 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -825,6 +825,9 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
         policy->user_policy.min = policy->cpuinfo.min_freq;
         policy->user_policy.max = policy->cpuinfo.max_freq;
 
+        blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+                                     CPUFREQ_START, policy);
+
 #ifdef CONFIG_SMP
 
 #ifdef CONFIG_HOTPLUG_CPU