1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a12cba32460e..ab419f8b2a84 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1697,10 +1697,17 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
 {
         struct regulator_dev *rdev = regulator->rdev;
-        int ret;
+        int ret = 0;
 
         mutex_lock(&rdev->mutex);
 
+        /* If we're setting the same range as last time the change
+         * should be a noop (some cpufreq implementations use the same
+         * voltage for multiple frequencies, for example).
+         */
+        if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
+                goto out;
+
         /* sanity check */
         if (!rdev->desc->ops->set_voltage &&
             !rdev->desc->ops->set_voltage_sel) {