diff options
| author | Bengt Jonsson <bengt.g.jonsson@stericsson.com> | 2010-11-10 11:06:22 +0100 |
|---|---|---|
| committer | Liam Girdwood <lrg@slimlogic.co.uk> | 2011-01-12 14:33:00 +0000 |
| commit | acaf6ffefdf65188071f88664435b86651d70e7c (patch) | |
| tree | ba026426b30b242a3070a93c513b7563f2bc1280 | |
| parent | 02fa3ec01a0df7a8ccc356d8e245a9a1423b3596 (diff) | |
regulator: enable supply regulator only when use count is zero
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>
| -rw-r--r-- | drivers/regulator/core.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 8a5d0ae191b..a48cf582dcd 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -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; + } } } |