| Message ID | 1435738921-25027-16-git-send-email-boris.brezillon@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Jul 01, 2015 at 10:22:01AM +0200, Boris Brezillon wrote: > The ->state field is currently initialized to 0, thus referencing the > voltage selector at index 0, which might not reflect the current voltage > value. This looks like it'll need reworking on top of Lee's recent changes to implement continuous voltage support for PWM regulators - we may be calculating the values to set dynamically at runtime.
On Tue, 14 Jul 2015 11:51:55 +0100 Mark Brown <broonie@kernel.org> wrote: > On Wed, Jul 01, 2015 at 10:22:01AM +0200, Boris Brezillon wrote: > > The ->state field is currently initialized to 0, thus referencing the > > voltage selector at index 0, which might not reflect the current voltage > > value. > > This looks like it'll need reworking on top of Lee's recent changes to > implement continuous voltage support for PWM regulators - we may be > calculating the values to set dynamically at runtime. Yep, I was planning on doing that in the next iteration, but I'd like to have Thierry's feedback before sending a new version.
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 8159518..4e29717 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -31,10 +31,35 @@ struct pwm_voltages { unsigned int dutycycle; }; +static void pwm_regulator_init_state(struct regulator_dev *rdev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pwm_state; + unsigned int dutycycle; + int i; + + pwm_get_state(drvdata->pwm, &pwm_state); + + if (!pwm_state.period) + return; + + dutycycle = (pwm_state.duty_cycle * 100) / pwm_state.period; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) { + drvdata->state = i; + return; + } + } +} + static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + if (drvdata->state < 0) + pwm_regulator_init_state(rdev); + return drvdata->state; } @@ -170,6 +195,7 @@ static int pwm_regulator_probe(struct platform_device *pdev) config.of_node = np; config.dev = &pdev->dev; config.driver_data = drvdata; + drvdata->state = -EINVAL; drvdata->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(drvdata->pwm)) {
The ->state field is currently initialized to 0, thus referencing the voltage selector at index 0, which might not reflect the current voltage value. If possible, retrieve the current voltage selector from the PWM state, else return -EINVAL. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> --- drivers/regulator/pwm-regulator.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)