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authorAxel Lin <axel.lin@gmail.com>2012-07-18 12:30:11 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-08-07 18:10:25 +0100
commita5f8ae2154eeb7ed18c6e3dbf6ac095ea4c3d5cf (patch)
treeae494cdcc5ed2594f5caf9675e403365ad12b19b /drivers/regulator
parent0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (diff)
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.c9
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);