linux-kernel - [PATCH V2 1/5] cpufreq: Introduce cpufreq_notify_post

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Date:	Mon,  2 Dec 2013 11:04:12 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...ysocki.net
Cc:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH V2 1/5] cpufreq: Introduce cpufreq_notify_post_transition()

This introduces another routine cpufreq_notify_post_transition() which can be
used to send POSTCHANGE notification for new freq with or without both
{PRE|POST}CHANGE notifications for last freq. This is useful at multiple places,
specially for sending transition failure notifications.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---

V1->V2:
- Not required to push it for 3.13 anymore and can go in 3.14.
- Rebased over following patchset as there were conflicts in unicore2 driver if
  following patchset is applied first (which should be the case):
  https://lkml.org/lkml/2013/10/30/553 (create cpufreq_generic_get() routine)

 drivers/cpufreq/cpufreq.c | 14 ++++++++++++++
 include/linux/cpufreq.h   |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5e27def..3b877d4 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -338,6 +338,20 @@ void cpufreq_notify_transition(struct cpufreq_policy *policy,
 }
 EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
 
+/* Do post notifications when there are chances that transition has failed */
+void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
+		struct cpufreq_freqs *freqs, int transition_failed)
+{
+	cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+	if (!transition_failed)
+		return;
+
+	swap(freqs->old, freqs->new);
+	cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
+	cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+}
+EXPORT_SYMBOL_GPL(cpufreq_notify_post_transition);
+
 
 /*********************************************************************
  *                          SYSFS INTERFACE                          *
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 276e646..b26bfab 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -316,6 +316,8 @@ int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 
 void cpufreq_notify_transition(struct cpufreq_policy *policy,
 		struct cpufreq_freqs *freqs, unsigned int state);
+void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
+		struct cpufreq_freqs *freqs, int transition_failed);
 
 #else /* CONFIG_CPU_FREQ */
 static inline int cpufreq_register_notifier(struct notifier_block *nb,
-- 
1.7.12.rc2.18.g61b472e

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