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authorAxel Lin <axel.lin@ingics.com>2013-02-06 11:09:48 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-02-08 11:26:03 +0000
commitc66a566afbe6e2c94b1ae70f70cc1e3d4c73639b (patch)
tree8f1b8621037193da762fc1a4b52c2561b3733bdb /drivers
parent92d7a55879c01b30349045501108e775655a4b92 (diff)
regulator: core: Optimize _regulator_do_set_voltage if voltage does not change
Optimize _regulator_do_set_voltage() for the case selector is equal to old_selector. Since the voltage does not change, we don't need to call set_voltage_sel() and set_voltage_time_sel() in this case. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/regulator/core.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c347fd03b727..7ec2ed6a1d7b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2185,8 +2185,11 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
best_val = rdev->desc->ops->list_voltage(rdev, ret);
if (min_uV <= best_val && max_uV >= best_val) {
selector = ret;
- ret = rdev->desc->ops->set_voltage_sel(rdev,
- ret);
+ if (old_selector == selector)
+ ret = 0;
+ else
+ ret = rdev->desc->ops->set_voltage_sel(
+ rdev, ret);
} else {
ret = -EINVAL;
}
@@ -2197,7 +2200,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
/* Call set_voltage_time_sel if successfully obtained old_selector */
if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
- rdev->desc->ops->set_voltage_time_sel) {
+ old_selector != selector && rdev->desc->ops->set_voltage_time_sel) {
delay = rdev->desc->ops->set_voltage_time_sel(rdev,
old_selector, selector);