linux-kernel - [PATCH 2/7] cpufreq: Retrieve current frequency from scaling drivers with internal governors

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Message-Id: <1360088646-19104-3-git-send-email-dirk.brandewie@gmail.com>
Date:	Tue,  5 Feb 2013 10:24:01 -0800
From:	dirk.brandewie@...il.com
To:	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Cc:	Dirk Brandewie <dirk.brandewie@...il.com>,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: [PATCH 2/7] cpufreq: Retrieve current frequency from scaling drivers with internal governors

From: Dirk Brandewie <dirk.brandewie@...il.com>

Scaling drivers that implement the cpufreq_driver.setpolicy() versus
the cpufreq_driver.target() interface do not set policy->cur.

Normally policy->cur is set during the call to cpufreq_driver.target()
when the frequnecy request is made by the governor.

If the scaling driver implements cpufreq_driver.setpolicy() and
cpufreq_driver.get() interfaces use cpufreq_driver.get() to retrieve
the current frequency.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
From: Dirk Brandewie <dirk.brandewie@...il.com>
Date: 2013-02-04 18:44:40 -0800

cpufreq: balance out cpufreq_cpu_{get,put} for scaling drivers using setpolicy

There is an additional reference added to the driver in
cpufreq_add_dev()  that is removed in__cpufreq_governor() if the
driver implements target().  Remove the last reference when the
driver implements setpolicy()

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com>
---
 drivers/cpufreq/cpufreq.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 2817c3c..96bc302 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1181,6 +1181,13 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
 	unsigned int ret_freq = 0;
 
+	if (cpufreq_driver && cpufreq_driver->setpolicy &&
+		cpufreq_driver->get) {
+		ret_freq = cpufreq_driver->get(cpu);
+		cpufreq_cpu_put(policy);
+		return ret_freq;
+	}
+
 	if (policy) {
 		ret_freq = policy->cur;
 		cpufreq_cpu_put(policy);
-- 
1.7.7.6

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