[PATCH v2 12/48] opp: Add dev_pm_opp_get_required_pstate()

From: Dmitry Osipenko
Date: Thu Dec 17 2020 - 13:13:21 EST


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

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/opp/core.c | 22 ++++++++++++++++++++++
include/linux/pm_opp.h | 10 ++++++++++
2 files changed, 32 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 0783a4ac819a..4774701ec82d 100644
--- 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 a17d92d923cc..0298b426fba3 100644
--- 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);
@@ -188,6 +191,13 @@ 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;
--
2.29.2