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>
diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 89c93d8..db09244 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -415,7 +415,7 @@
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 @@
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;