diff options
| author | Axel Lin <axel.lin@gmail.com> | 2012-04-10 06:21:01 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-10 09:14:01 (GMT) |
| commit | 2e42a7dc407163dd99ab5741b6fd167877708623 (patch) | |
| tree | 0d25b62ca62fc39cdb29b731ffdf91e93ff3f996 | |
| parent | 2358b7763ee6673c0d08ddf9dcfe96e982e9b26f (diff) | |
| download | linux-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>
| -rw-r--r-- | drivers/regulator/max8998.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c index 74b0b0c..7e831a9 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; |