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-rw-r--r--drivers/regulator/pwm-regulator.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 90f8b7fd0437..666bc3bb52ef 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -145,6 +145,7 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
unsigned int duty_pulse;
u64 req_period;
u32 rem;
+ int old_uV = pwm_regulator_get_voltage(rdev);
int ret;
pwm_get_args(drvdata->pwm, &pargs);
@@ -174,8 +175,12 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
drvdata->volt_uV = min_uV;
- /* Delay required by PWM regulator to settle to the new voltage */
- usleep_range(ramp_delay, ramp_delay + 1000);
+ if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev))
+ return 0;
+
+ /* Ramp delay is in uV/uS. Adjust to uS and delay */
+ ramp_delay = DIV_ROUND_UP(abs(min_uV - old_uV), ramp_delay);
+ usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));
return 0;
}