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

Bartlomiej Zolnierkiewicz
2015-07-09T15:44:46Z

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

Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Javier Martinez Canillas <javier@dowhile0.org>
Cc: Thomas Abraham <thomas.ab@samsung.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@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