[PATCH v2 1/7] opp: add dev_pm_opp_get_turbo_mode_setting() helper

[Bartlomiej Zolnierkiewicz]

Add dev_pm_opp_get_turbo_mode_setting() helper for getting turbo
mode setting for a given opp.

Cc: Tomasz Figa <tomasz.figa at gmail.com>
Cc: Michael Turquette <mturquette at baylibre.com>
Cc: Javier Martinez Canillas <javier at dowhile0.org>
Cc: Thomas Abraham <thomas.ab at samsung.com>
Cc: Viresh Kumar <viresh.kumar at linaro.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie at samsung.com>
---
 drivers/base/power/opp.c | 31 +++++++++++++++++++++++++++++++
 include/linux/pm_opp.h   |  7 +++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index e24502a2..6b34b2a 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -287,6 +287,37 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
 
 /**
+ * dev_pm_opp_get_turbo_mode_setting() - Gets the turbo setting
+ * @opp:	opp for which turbo mode setting has to be returned for
+ *
+ * Return: turbo mode setting corresponding to the opp (true or false)
+ *
+ * Locking: This function must be called under rcu_read_lock(). opp is a rcu
+ * protected pointer. This means that opp which could have been fetched by
+ * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are
+ * under RCU lock. The pointer returned by the opp_find_freq family must be
+ * used in the same section as the usage of this function with the pointer
+ * prior to unlocking with rcu_read_unlock() to maintain the integrity of the
+ * pointer.
+ */
+bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp)
+{
+	struct dev_pm_opp *tmp_opp;
+	bool f = false;
+
+	opp_rcu_lockdep_assert();
+
+	tmp_opp = rcu_dereference(opp);
+	if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
+		pr_err("%s: Invalid parameters\n", __func__);
+	else
+		f = tmp_opp->turbo;
+
+	return f;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_turbo_mode_setting);
+
+/**
  * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
  * @dev:	device for which we do this operation
  *
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index bb52fae..7856baf 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -30,6 +30,8 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
+bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp);
+
 int dev_pm_opp_get_opp_count(struct device *dev);
 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
 
@@ -63,6 +65,11 @@ static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 	return 0;
 }
 
+static inline bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp)
+{
+	return false;
+}
+
 static inline int dev_pm_opp_get_opp_count(struct device *dev)
 {
 	return 0;
-- 
1.9.1