3 files changed, 54 insertions, 0 deletions

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 9f098a82cf04..10c3510d72a9 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -29,6 +29,7 @@
 #include <linux/async.h>
 #include <linux/suspend.h>
 #include <trace/events/power.h>
+#include <linux/cpufreq.h>
 #include <linux/cpuidle.h>
 #include "../base.h"
 #include "power.h"
@@ -473,6 +474,7 @@ static void dpm_resume_noirq(pm_message_t state)
         dpm_show_time(starttime, state, "noirq");
         resume_device_irqs();
         cpuidle_resume();
+        cpufreq_resume();
 }
 
 /**
@@ -885,6 +887,7 @@ static int dpm_suspend_noirq(pm_message_t state)
         ktime_t starttime = ktime_get();
         int error = 0;
 
+        cpufreq_suspend();
         cpuidle_pause();
         suspend_device_irqs();
         mutex_lock(&dpm_list_mtx);
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 02d534da22dd..606224a8abc2 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/suspend.h>
 #include <linux/syscore_ops.h>
 #include <linux/tick.h>
 #include <trace/events/power.h>
@@ -47,6 +48,9 @@ static LIST_HEAD(cpufreq_policy_list);
 static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
 #endif
 
+/* Flag to suspend/resume CPUFreq governors */
+static bool cpufreq_suspended;
+
 static inline bool has_target(void)
 {
         return cpufreq_driver->target_index || cpufreq_driver->target;
@@ -1462,6 +1466,41 @@ static struct subsys_interface cpufreq_interface = {
         .remove_dev     = cpufreq_remove_dev,
 };
 
+void cpufreq_suspend(void)
+{
+        struct cpufreq_policy *policy;
+
+        if (!has_target())
+                return;
+
+        pr_debug("%s: Suspending Governors\n", __func__);
+
+        list_for_each_entry(policy, &cpufreq_policy_list, policy_list)
+                if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP))
+                        pr_err("%s: Failed to stop governor for policy: %p\n",
+                                __func__, policy);
+
+        cpufreq_suspended = true;
+}
+
+void cpufreq_resume(void)
+{
+        struct cpufreq_policy *policy;
+
+        if (!has_target())
+                return;
+
+        pr_debug("%s: Resuming Governors\n", __func__);
+
+        cpufreq_suspended = false;
+
+        list_for_each_entry(policy, &cpufreq_policy_list, policy_list)
+                if (__cpufreq_governor(policy, CPUFREQ_GOV_START)
+                    || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS))
+                        pr_err("%s: Failed to start governor for policy: %p\n",
+                                __func__, policy);
+}
+
 /**
  * cpufreq_bp_suspend - Prepare the boot CPU for system suspend.
  *
@@ -1764,6 +1803,10 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
         struct cpufreq_governor *gov = NULL;
 #endif
 
+        /* Don't start any governor operations if we are entering suspend */
+        if (cpufreq_suspended)
+                return 0;
+
         if (policy->governor->max_transition_latency &&
             policy->cpuinfo.transition_latency >
             policy->governor->max_transition_latency) {
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 5bd6ab9b0c27..91716658e9a1 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -272,6 +272,14 @@ cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
                         policy->cpuinfo.max_freq);
 }
 
+#ifdef CONFIG_CPU_FREQ
+void cpufreq_suspend(void);
+void cpufreq_resume(void);
+#else
+static inline void cpufreq_suspend(void) {}
+static inline void cpufreq_resume(void) {}
+#endif
+
 /*********************************************************************
  *                     CPUFREQ NOTIFIER INTERFACE                    *
  *********************************************************************/