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| author | Axel Lin <axel.lin@gmail.com> | 2012-04-10 23:07:52 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-10 17:28:52 +0100 |
| commit | 0cb2f1239dd7acf72fb60adb53c1fdaa65b719a2 (patch) | |
| tree | 8226f9e3054e927dc50c38e8fabb3cb0ff82e4f4 /drivers/regulator/twl-regulator.c | |
| parent | 19a8da2187249c02574ccffaf72637eb224d11c4 (diff) | |
| download | lwn-0cb2f1239dd7acf72fb60adb53c1fdaa65b719a2.tar.gz lwn-0cb2f1239dd7acf72fb60adb53c1fdaa65b719a2.zip | |
regulator: twl-regulator: Fix off-by-one vsel setting in twl6030smps_set_voltage
commit 268a1 "regulator: twl-regulator: Use DIV_ROUND_UP at appropriate places"
introduced an off-by-one bug for setting vsel.
The linear calculation code in twl6030smps_list_voltage() does subtract index
by 1 so we need the vsel++ after DIV_ROUND_UP.
The original code use this trick to differentiate if we are going to set the
voltage to 0 or the voltage falls within the linear calculation range.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/twl-regulator.c')
| -rw-r--r-- | drivers/regulator/twl-regulator.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c index 7384d277ef40..68d9a7b6e1f7 100644 --- a/drivers/regulator/twl-regulator.c +++ b/drivers/regulator/twl-regulator.c @@ -788,6 +788,7 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, else if ((min_uV >= 600000) && (min_uV <= 1300000)) { int calc_uV; vsel = DIV_ROUND_UP(min_uV - 600000, 12500); + vsel++; calc_uV = twl6030smps_list_voltage(rdev, vsel); if (calc_uV > max_uV) return -EINVAL; @@ -814,6 +815,7 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, else if ((min_uV >= 700000) && (min_uV <= 1420000)) { int calc_uV; vsel = DIV_ROUND_UP(min_uV - 700000, 12500); + vsel++; calc_uV = twl6030smps_list_voltage(rdev, vsel); if (calc_uV > max_uV) return -EINVAL; @@ -835,16 +837,20 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, return -EINVAL; break; case SMPS_EXTENDED_EN: - if (min_uV == 0) + if (min_uV == 0) { vsel = 0; - else if ((min_uV >= 1852000) && (max_uV <= 4013600)) + } else if ((min_uV >= 1852000) && (max_uV <= 4013600)) { vsel = DIV_ROUND_UP(min_uV - 1852000, 38600); + vsel++; + } break; case SMPS_OFFSET_EN|SMPS_EXTENDED_EN: - if (min_uV == 0) + if (min_uV == 0) { vsel = 0; - else if ((min_uV >= 2161000) && (max_uV <= 4321000)) + } else if ((min_uV >= 2161000) && (max_uV <= 4321000)) { vsel = DIV_ROUND_UP(min_uV - 2161000, 38600); + vsel++; + } break; } |