The continuous PWM voltage regulator is caching the voltage value in the ->volt_uV field. While most of the time this value should reflect the real voltage, sometime it can be sightly different if the PWM device rounded the set_duty_cycle request. Moreover, this value is not valid until someone has modified the regulator output.
Remove the ->volt_uV field and always rely on the PWM state to calculate the regulator output.
Signed-off-by: Boris Brezillon boris.brezillon@free-electrons.com --- drivers/regulator/pwm-regulator.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 9374796..77f42d8 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -35,9 +35,6 @@ struct pwm_regulator_data { struct regulator_ops ops;
int state; - - /* Continuous voltage */ - int volt_uV; };
struct pwm_voltages { @@ -167,11 +164,27 @@ static int pwm_voltage_to_duty_cycle_percentage(struct regulator_dev *rdev, int return ((req_uV * 100) - (min_uV * 100)) / diff; }
+static int pwm_duty_cycle_percentage_to_voltage(struct regulator_dev *rdev, + int dutycycle) +{ + int min_uV = rdev->constraints->min_uV; + int max_uV = rdev->constraints->max_uV; + int diff = max_uV - min_uV; + + return min_uV + ((diff * dutycycle) / 100); +} + static int pwm_regulator_get_voltage(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pstate; + u64 dutycycle;
- return drvdata->volt_uV; + pwm_get_state(drvdata->pwm, &pstate); + dutycycle = pstate.duty_cycle * 100; + do_div(dutycycle, pstate.period); + + return pwm_duty_cycle_percentage_to_voltage(rdev, dutycycle); }
static int pwm_regulator_set_voltage(struct regulator_dev *rdev, @@ -196,8 +209,6 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, return ret; }
- drvdata->volt_uV = min_uV; - /* Delay required by PWM regulator to settle to the new voltage */ usleep_range(ramp_delay, ramp_delay + 1000);