opp: Add dev_pm_opp_get_required_pstate()

Add dev_pm_opp_get_required_pstate() which allows OPP users to retrieve
required performance state of a given OPP.

Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index b29f311467700c52ca6b9621e23a2ccd206638ea..64a95aaa90eb74c6da146ee60b098cad55c736dc 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -145,6 +145,28 @@ unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
 
+/**
+ * dev_pm_opp_get_required_pstate() - Gets the required performance state
+ *                                    corresponding to an available opp
+ * @opp:       opp for which performance state has to be returned for
+ * @index:     index of the required opp
+ *
+ * Return: performance state read from device tree corresponding to the
+ * required opp, else return 0.
+ */
+unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
+                                           unsigned int index)
+{
+       if (IS_ERR_OR_NULL(opp) || !opp->available ||
+           index >= opp->opp_table->required_opp_count) {
+               pr_err("%s: Invalid parameters\n", __func__);
+               return 0;
+       }
+
+       return opp->required_opps[index]->pstate;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
+
 /**
  * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
  * @opp: opp for which turbo mode is being verified

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 2b3030cb2ed20c4d86ee40122ed5f188c4ac430e..8f926815bad97b4ddb01dba484680d3db9b90c12 100644 (file)
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -98,6 +98,9 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
 unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp);
 
+unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
+                                           unsigned int index);
+
 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
 
 int dev_pm_opp_get_opp_count(struct device *dev);
@@ -186,6 +189,13 @@ static inline unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
        return 0;
 }
 
+static inline
+unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
+                                           unsigned int index)
+{
+       return 0;
+}
+
 static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
 {
        return false;