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authorViresh Kumar <viresh.kumar@linaro.org>2013-11-27 09:09:42 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-11-28 14:47:31 +0100
commit5a87182aa21d6d5d306840feab9321818dd3e2a3 (patch)
tree86ead8ebc52067f57ec2f78271fa5dbe9c58e066 /include
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 'include')
-rw-r--r--include/linux/cpufreq.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 5bd6ab9b0c2..91716658e9a 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 *
*********************************************************************/