From 05fda3b1abc23d832144e9497fb218870927d645 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Fri, 3 Dec 2010 11:31:07 +0100 Subject: regulator: Take into account the requirements of all consumers Extend the regulator_set_voltage() function to take into account the voltage requirements of all consumers of the regulator being changed, in order to set the voltage to the minimum voltage acceptable to all consumers. The existing behaviour was that the latest regulator_set_voltage() call would win over previous regulator_set_voltage() calls even if setting the voltage to a non-acceptable level from other consumers. Signed-off-by: Thomas Petazzoni Cc: Liam Girdwood Cc: Mark Brown Cc: Kevin Hilman Acked-by: Mark Brown Signed-off-by: Liam Girdwood --- drivers/regulator/core.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/regulator') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e63366f826f..a1b12379b09 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -142,6 +142,27 @@ static int regulator_check_voltage(struct regulator_dev *rdev, return 0; } +/* Make sure we select a voltage that suits the needs of all + * regulator consumers + */ +static int regulator_check_consumers(struct regulator_dev *rdev, + int *min_uV, int *max_uV) +{ + struct regulator *regulator; + + list_for_each_entry(regulator, &rdev->consumer_list, list) { + if (*max_uV > regulator->max_uV) + *max_uV = regulator->max_uV; + if (*min_uV < regulator->min_uV) + *min_uV = regulator->min_uV; + } + + if (*min_uV > *max_uV) + return -EINVAL; + + return 0; +} + /* current constraint check */ static int regulator_check_current_limit(struct regulator_dev *rdev, int *min_uA, int *max_uA) @@ -1637,6 +1658,10 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) regulator->min_uV = min_uV; regulator->max_uV = max_uV; + ret = regulator_check_consumers(rdev, &min_uV, &max_uV); + if (ret < 0) + goto out; + trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector); -- cgit v1.2.3-70-g09d2