regulator: max8997: Use simple equation to get selector

It's more efficient to get the best selector by simple equation.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 89c93d891140..db09244bb3ed 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -415,7 +415,7 @@ static inline int max8997_get_voltage_proper_val(
                 const struct voltage_map_desc *desc,
                 int min_vol, int max_vol)
 {
-        int i = 0;
+        int i;
 
         if (desc == NULL)
                 return -EINVAL;
@@ -423,9 +423,10 @@ static inline int max8997_get_voltage_proper_val(
         if (max_vol < desc->min || min_vol > desc->max)
                 return -EINVAL;
 
-        while (desc->min + desc->step * i < min_vol &&
-                        desc->min + desc->step * i < desc->max)
-                i++;
+        if (min_vol < desc->min)
+                min_vol = desc->min;
+
+        i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 
         if (desc->min + desc->step * i > max_vol)
                 return -EINVAL;