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authorAxel Lin <axel.lin@ingics.com>2013-04-10 14:46:20 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-16 12:23:27 +0100
commit241896ce8d112f10dae5538be41fad9eeb9e5e46 (patch)
tree153ba7a7da953356171e09eb0cd37a9477d61c01 /drivers/regulator/ab8500.c
parent375dc9c141b4d62b92bb171817039ef764c61d9f (diff)
downloadlinux-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.c42
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, &regval);
-
+ info->expand_register.voltage_bank,
+ info->expand_register.voltage_reg, &regval_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, &regval_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, &regval);
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,