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authorAxel Lin <axel.lin@gmail.com>2012-04-10 10:21:01 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-04-10 13:14:01 +0400
commit2e42a7dc407163dd99ab5741b6fd167877708623 (patch)
tree0d25b62ca62fc39cdb29b731ffdf91e93ff3f996 /drivers/regulator/max8998.c
parent2358b7763ee6673c0d08ddf9dcfe96e982e9b26f (diff)
downloadlinux-2e42a7dc407163dd99ab5741b6fd167877708623.tar.xz
regulator: max8998: 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>
Diffstat (limited to 'drivers/regulator/max8998.c')
-rw-r--r--drivers/regulator/max8998.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 74b0b0c94120..7e831a94bf84 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -306,8 +306,7 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
const struct voltage_map_desc *desc;
int ldo = rdev_get_id(rdev);
- int reg, shift = 0, mask, ret;
- int i = 0;
+ int reg, shift = 0, mask, ret, i;
if (ldo >= ARRAY_SIZE(ldo_voltage_map))
return -EINVAL;
@@ -319,9 +318,10 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
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;
@@ -359,7 +359,7 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
const struct voltage_map_desc *desc;
int buck = rdev_get_id(rdev);
int reg, shift = 0, mask, ret;
- int difference = 0, i = 0, j = 0, previous_vol = 0;
+ int difference = 0, i, j = 0, previous_vol = 0;
u8 val = 0;
static u8 buck1_last_val;
@@ -374,9 +374,10 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
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;