regulator: core: Ensure we are at least in bounds for our constraints
Currently we only attempt to set the voltage during constraints
application if an exact voltage is specified. Extend this so that if
the currently set voltage for the regulator is outside the bounds set in
constraints we will move the voltage to the nearest constraint, raising
to the minimum or lowering to the maximum as needed. This ensures that
drivers can probe without the hardware being driven out of spec.
Reported-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Tested-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e0b7642..881c37e 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -906,7 +906,8 @@
/* do we need to apply the constraint voltage */
if (rdev->constraints->apply_uV &&
- rdev->constraints->min_uV == rdev->constraints->max_uV) {
+ rdev->constraints->min_uV && rdev->constraints->max_uV) {
+ int target_min, target_max;
int current_uV = _regulator_get_voltage(rdev);
if (current_uV < 0) {
rdev_err(rdev,
@@ -914,15 +915,32 @@
current_uV);
return current_uV;
}
- if (current_uV < rdev->constraints->min_uV ||
- current_uV > rdev->constraints->max_uV) {
+
+ /*
+ * If we're below the minimum voltage move up to the
+ * minimum voltage, if we're above the maximum voltage
+ * then move down to the maximum.
+ */
+ target_min = current_uV;
+ target_max = current_uV;
+
+ if (current_uV < rdev->constraints->min_uV) {
+ target_min = rdev->constraints->min_uV;
+ target_max = rdev->constraints->min_uV;
+ }
+
+ if (current_uV > rdev->constraints->max_uV) {
+ target_min = rdev->constraints->max_uV;
+ target_max = rdev->constraints->max_uV;
+ }
+
+ if (target_min != current_uV || target_max != current_uV) {
ret = _regulator_do_set_voltage(
- rdev, rdev->constraints->min_uV,
- rdev->constraints->max_uV);
+ rdev, target_min, target_max);
if (ret < 0) {
rdev_err(rdev,
- "failed to apply %duV constraint(%d)\n",
- rdev->constraints->min_uV, ret);
+ "failed to apply %d-%duV constraint(%d)\n",
+ target_min, target_max, ret);
return ret;
}
}