regulator: core: Allow regulator_set_voltage for fixed regulators

Make it okay to call regulator_set_voltage on regulators with fixed
voltage if the requested range overlaps the current/configured voltage.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b38a6b669e8c..0cd1a3b8e589 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2395,6 +2395,7 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
         struct regulator_dev *rdev = regulator->rdev;
         int ret = 0;
         int old_min_uV, old_max_uV;
+        int current_uV;
 
         mutex_lock(&rdev->mutex);
 
@@ -2405,6 +2406,19 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
                 goto out;
 
+        /* If we're trying to set a range that overlaps the current voltage,
+         * return succesfully even though the regulator does not support
+         * changing the voltage.
+         */
+        if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
+                current_uV = _regulator_get_voltage(rdev);
+                if (min_uV <= current_uV && current_uV <= max_uV) {
+                        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) {