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authorViresh Kumar2013-11-27 09:09:42 +0530
committerRafael J. Wysocki2013-11-28 14:47:31 +0100
commit5a87182aa21d6d5d306840feab9321818dd3e2a3 (patch)
tree86ead8ebc52067f57ec2f78271fa5dbe9c58e066 /drivers
parent3d3c6f54bccf0a621682d17e25cf22895a0c6e5a (diff)
cpufreq: suspend governors on system suspend/hibernate
This patch adds cpufreq suspend/resume calls to dpm_{suspend|resume}_noirq() for handling suspend/resume of cpufreq governors. Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found anr issue where tunables configuration for clusters/sockets with non-boot CPUs was getting lost after suspend/resume, as we were notifying governors with CPUFREQ_GOV_POLICY_EXIT on removal of the last cpu for that policy and so deallocating memory for tunables. This is fixed by this patch as we don't allow any operation on governors after device suspend and before device resume now. Reported-and-tested-by: Lan Tianyu <tianyu.lan@intel.com> Reported-by: Jinhyuk Choi <jinchoi@broadcom.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> [rjw: Changelog, minor cleanups] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/power/main.c3
-rw-r--r--drivers/cpufreq/cpufreq.c43
2 files changed, 46 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) {