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regulator: Optimise out noop voltage changes 

If a consumer sets the same voltage range as is currently configured
for that consumer there's no need to run through setting the voltage
again. This pattern may occur with some CPUfreq implementations where
the same voltage range is used for multiple frequencies.

Reported-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-12-16 15:49:37 +00:00 committed by Liam Girdwood
parent 606a256281
commit 95a3c23ae6
1 changed files with 8 additions and 1 deletions
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9
drivers/regulator/core.c
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@ -1697,10 +1697,17 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
struct regulator_dev *rdev = regulator->rdev;
int ret;
int ret = 0;
mutex_lock(&rdev->mutex);
/* If we're setting the same range as last time the change
* should be a noop (some cpufreq implementations use the same
* voltage for multiple frequencies, for example).
*/
if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
goto out;
/* sanity check */
if (!rdev->desc->ops->set_voltage &&
!rdev->desc->ops->set_voltage_sel) {