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-rw-r--r--drivers/opp/core.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 0420f7e8ad5b..0e7703fe733f 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -526,6 +526,60 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
+/**
+ * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
+ * target voltage.
+ * @dev: Device for which we do this operation.
+ * @u_volt: Target voltage.
+ *
+ * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
+ *
+ * Return: matching *opp, else returns ERR_PTR in case of error which should be
+ * handled using IS_ERR.
+ *
+ * Error return values can be:
+ * EINVAL: bad parameters
+ *
+ * The callers are required to call dev_pm_opp_put() for the returned OPP after
+ * use.
+ */
+struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
+ unsigned long u_volt)
+{
+ struct opp_table *opp_table;
+ struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+
+ if (!dev || !u_volt) {
+ dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
+ u_volt);
+ return ERR_PTR(-EINVAL);
+ }
+
+ opp_table = _find_opp_table(dev);
+ if (IS_ERR(opp_table))
+ return ERR_CAST(opp_table);
+
+ mutex_lock(&opp_table->lock);
+
+ list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
+ if (temp_opp->available) {
+ if (temp_opp->supplies[0].u_volt > u_volt)
+ break;
+ opp = temp_opp;
+ }
+ }
+
+ /* Increment the reference count of OPP */
+ if (!IS_ERR(opp))
+ dev_pm_opp_get(opp);
+
+ mutex_unlock(&opp_table->lock);
+ dev_pm_opp_put_opp_table(opp_table);
+
+ return opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
+
static int _set_opp_voltage(struct device *dev, struct regulator *reg,
struct dev_pm_opp_supply *supply)
{