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>
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
index 0a62ef9..29a727c 100644
--- a/drivers/regulator/ab8500.c
+++ b/drivers/regulator/ab8500.c
@@ -521,7 +521,7 @@
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 @@
}
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");
- return ret;
- }
-
- ret = abx500_get_register_interruptible(info->dev,
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 expand reg for regulator\n");
+ return ret;
+ }
+ 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 @@
}
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);
+ "%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);
- 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;
-
- return val;
+ return (regval & info->voltage_mask) >> info->voltage_shift;
}
static int ab8500_regulator_set_voltage_sel(struct regulator_dev *rdev,