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| author | Axel Lin <axel.lin@gmail.com> | 2012-07-18 12:30:11 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-08-07 18:10:25 +0100 |
| commit | a5f8ae2154eeb7ed18c6e3dbf6ac095ea4c3d5cf (patch) | |
| tree | ae494cdcc5ed2594f5caf9675e403365ad12b19b /drivers/regulator | |
| parent | 0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (diff) | |
| download | blackbird-op-linux-a5f8ae2154eeb7ed18c6e3dbf6ac095ea4c3d5cf.tar.gz blackbird-op-linux-a5f8ae2154eeb7ed18c6e3dbf6ac095ea4c3d5cf.zip | |
regulator: palmas: Fix calculating selector in palmas_map_voltage_ldo
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>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/palmas-regulator.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c index 17d19fbbc490..0fcf3550f65d 100644 --- a/drivers/regulator/palmas-regulator.c +++ b/drivers/regulator/palmas-regulator.c @@ -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); |
