diff options
| author | Axel Lin <axel.lin@ingics.com> | 2013-04-10 14:46:20 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-16 12:23:27 +0100 |
| commit | 241896ce8d112f10dae5538be41fad9eeb9e5e46 (patch) | |
| tree | 153ba7a7da953356171e09eb0cd37a9477d61c01 /drivers/regulator/ab8500.c | |
| parent | 375dc9c141b4d62b92bb171817039ef764c61d9f (diff) | |
| download | linux-241896ce8d112f10dae5538be41fad9eeb9e5e46.tar.bz2 | |
regulator: ab8500: Optimize ab8540_aux3_regulator_get_voltage_sel
We can save a register read operation in some case if read
expand_register first.
If info->expand_register.voltage_mask bit is set, no need to read
voltage_reg.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/ab8500.c')
| -rw-r--r-- | drivers/regulator/ab8500.c | 42 |
1 files changed, 18 insertions, 24 deletions
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c index 0a62ef942cfb..29a727ca399b 100644 --- a/drivers/regulator/ab8500.c +++ b/drivers/regulator/ab8500.c @@ -521,7 +521,7 @@ static int ab8500_regulator_get_voltage_sel(struct regulator_dev *rdev) static int ab8540_aux3_regulator_get_voltage_sel(struct regulator_dev *rdev) { - int ret, val; + int ret; struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); u8 regval, regval_expand; @@ -531,18 +531,25 @@ static int ab8540_aux3_regulator_get_voltage_sel(struct regulator_dev *rdev) } ret = abx500_get_register_interruptible(info->dev, - info->voltage_bank, info->voltage_reg, ®val); - + info->expand_register.voltage_bank, + info->expand_register.voltage_reg, ®val_expand); if (ret < 0) { dev_err(rdev_get_dev(rdev), - "couldn't read voltage reg for regulator\n"); + "couldn't read voltage expand reg for regulator\n"); return ret; } - ret = abx500_get_register_interruptible(info->dev, - info->expand_register.voltage_bank, - info->expand_register.voltage_reg, ®val_expand); + dev_vdbg(rdev_get_dev(rdev), + "%s-get_voltage expand (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n", + info->desc.name, info->expand_register.voltage_bank, + info->expand_register.voltage_reg, + info->expand_register.voltage_mask, regval_expand); + if (regval_expand & info->expand_register.voltage_mask) + return info->expand_register.voltage_limit; + + ret = abx500_get_register_interruptible(info->dev, + info->voltage_bank, info->voltage_reg, ®val); if (ret < 0) { dev_err(rdev_get_dev(rdev), "couldn't read voltage reg for regulator\n"); @@ -550,24 +557,11 @@ static int ab8540_aux3_regulator_get_voltage_sel(struct regulator_dev *rdev) } dev_vdbg(rdev_get_dev(rdev), - "%s-get_voltage (bank, reg, mask, value): 0x%x, 0x%x, 0x%x," - " 0x%x\n", - info->desc.name, info->voltage_bank, info->voltage_reg, - info->voltage_mask, regval); - dev_vdbg(rdev_get_dev(rdev), - "%s-get_voltage expand (bank, reg, mask, value): 0x%x, 0x%x, 0x%x," - " 0x%x\n", - info->desc.name, info->expand_register.voltage_bank, - info->expand_register.voltage_reg, - info->expand_register.voltage_mask, regval_expand); - - if (regval_expand&(info->expand_register.voltage_mask)) - /* Vaux3 has a different layout */ - val = info->expand_register.voltage_limit; - else - val = (regval & info->voltage_mask) >> info->voltage_shift; + "%s-get_voltage (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n", + info->desc.name, info->voltage_bank, info->voltage_reg, + info->voltage_mask, regval); - return val; + return (regval & info->voltage_mask) >> info->voltage_shift; } static int ab8500_regulator_set_voltage_sel(struct regulator_dev *rdev, |