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regulator: enable supply regulator only when use count is zero

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Supply regulators are disabled only when the last
reference count is removed on the child regulator
(the use count goes from 1 to 0). This patch changes
the behaviour of enable so the supply regulator is
enabled only when the use count of the child
regulator goes from 0 to 1.

Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Bengt Jonsson 2010-11-10 11:06:22 +01:00 committed by Liam Girdwood
parent 02fa3ec01a
commit acaf6ffefd
1 changed files with 11 additions and 9 deletions
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20
drivers/regulator/core.c
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@ -1273,15 +1273,17 @@ static int _regulator_enable(struct regulator_dev *rdev)
{
int ret, delay;
/* do we need to enable the supply regulator first */
if (rdev->supply) {
mutex_lock(&rdev->supply->mutex);
ret = _regulator_enable(rdev->supply);
mutex_unlock(&rdev->supply->mutex);
if (ret < 0) {
printk(KERN_ERR "%s: failed to enable %s: %d\n",
__func__, rdev_get_name(rdev), ret);
return ret;
if (rdev->use_count == 0) {
/* do we need to enable the supply regulator first */
if (rdev->supply) {
mutex_lock(&rdev->supply->mutex);
ret = _regulator_enable(rdev->supply);
mutex_unlock(&rdev->supply->mutex);
if (ret < 0) {
printk(KERN_ERR "%s: failed to enable %s: %d\n",
__func__, rdev_get_name(rdev), ret);
return ret;
}
}
}