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regulator: palmas: Fix calculating selector in palmas_map_voltage_ldo

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This patch fixes below issues when choosing selector:

1. Current code returns negative selector if min_uV < 900000 which is wrong.
   For example, it is possible to satisfy the request with selector = 1 if
   the requested min_uV is 850000.
2. Current code may select a voltage lower than requested min_uV.
   For example, if the requested min_uV is 945000, current code chooses
   selector = 1 which is lower than requested min_uV.
   DIV_ROUND_UP to avoid this case.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-07-18 12:30:11 +08:00 committed by Mark Brown
parent 0d7614f09c
commit a5f8ae2154
1 changed files with 6 additions and 3 deletions
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9
drivers/regulator/palmas-regulator.c
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@ -486,9 +486,12 @@ static int palmas_map_voltage_ldo(struct regulator_dev *rdev,
{
int ret, voltage;
ret = ((min_uV - 900000) / 50000) + 1;
if (ret < 0)
return ret;
if (min_uV == 0)
return 0;
if (min_uV < 900000)
min_uV = 900000;
ret = DIV_ROUND_UP(min_uV - 900000, 50000) + 1;
/* Map back into a voltage to verify we're still in bounds */
voltage = palmas_list_voltage_ldo(rdev, ret);