diff options
| author | Axel Lin <axel.lin@ingics.com> | 2012-11-24 00:53:22 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-11-27 20:25:18 +0000 |
| commit | 7a4beda0c6a87af26b7e2144842a0205fa9fd674 (patch) | |
| tree | 2e237837116ca706e6ef114379c8cb483986e34a /drivers | |
| parent | 16ed9f0701d2bb06d96754ba1d3edbf9aa5faeef (diff) | |
regulator: as3711: Fix the logic in as3711_sel_check
Below equation means the "voltage" is the "smallest" voltage within specific
range.
ret = DIV_ROUND_UP(min - bottom) / step;
voltage = ret * step + bottom;
If we do try 1 down when (voltage > max), new voltage is then less than min
voltage. Which means the new voltage is not in the requested voltage range.
This patch also includes below cleanups:
- Use DIV_ROUND_UP
- rename variable 'ret' to 'sel' for better readability because as3711_sel_check
returns the selector.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/as3711-regulator.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/regulator/as3711-regulator.c b/drivers/regulator/as3711-regulator.c index 5e813b9059e..2f1341db38a 100644 --- a/drivers/regulator/as3711-regulator.c +++ b/drivers/regulator/as3711-regulator.c @@ -93,24 +93,17 @@ static int as3711_bound_check(struct regulator_dev *rdev, static int as3711_sel_check(int min, int max, int bottom, int step) { - int ret, voltage; + int sel, voltage; /* Round up min, when dividing: keeps us within the range */ - ret = (min - bottom + step - 1) / step; - voltage = ret * step + bottom; + sel = DIV_ROUND_UP(min - bottom, step); + voltage = sel * step + bottom; pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__, - min, max, bottom, step, ret); - if (voltage > max) { - /* - * Try 1 down. It will take us below min, but as long we stay - * above bottom, we're fine. - */ - ret--; - voltage = ret * step + bottom; - if (voltage < bottom) - return -EINVAL; - } - return ret; + min, max, bottom, step, sel); + if (voltage > max) + return -EINVAL; + + return sel; } static int as3711_map_voltage_sd(struct regulator_dev *rdev, |