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>
(cherry picked from commit c00dc359e5e0b10de993651d8e73e60c41bf29cd)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit d5c3595331d512c6af6b636cef687421c2ba11e3)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index afca1bc..bac485a 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2399,6 +2399,7 @@ 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);
 
@@ -2409,6 +2410,19 @@ 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) {