diff options
| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-06-14 11:13:20 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-07-11 08:44:29 +0200 |
| commit | d9070fdbe40a04b61262bac0f7ff0c7c29a68015 (patch) | |
| tree | 06eb17c64d51968825b97a9ed43e7aa2a159e1d9 /drivers | |
| parent | regulator: pwm: Properly initialize the ->state field (diff) | |
| download | linux-d9070fdbe40a04b61262bac0f7ff0c7c29a68015.tar.xz linux-d9070fdbe40a04b61262bac0f7ff0c7c29a68015.zip | |
regulator: pwm: Retrieve correct voltage
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>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/pwm-regulator.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 7d26d3b0eed6..ae0bebbfda9d 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -37,9 +37,6 @@ struct pwm_regulator_data { int state; - /* Continuous voltage */ - int volt_uV; - /* Enable GPIO */ struct gpio_desc *enb_gpio; }; @@ -148,8 +145,13 @@ static int pwm_regulator_is_enabled(struct regulator_dev *dev) static int pwm_regulator_get_voltage(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + int min_uV = rdev->constraints->min_uV; + int diff = rdev->constraints->max_uV - min_uV; + struct pwm_state pstate; - return drvdata->volt_uV; + pwm_get_state(drvdata->pwm, &pstate); + + return min_uV + pwm_get_relative_duty_cycle(&pstate, diff); } static int pwm_regulator_set_voltage(struct regulator_dev *rdev, @@ -176,8 +178,6 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, return ret; } - drvdata->volt_uV = min_uV; - if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev)) return 0; |