diff options
| author | Doug Brown <doug@schmorgal.com> | 2022-12-02 21:35:21 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2022-12-06 14:46:13 +0300 |
| commit | 152f2d1def5e4b974947877126ff292a68a8c521 (patch) | |
| tree | d4c2be676ea7464f4d2578d88a6347ee2b8e4ba5 /drivers/pwm | |
| parent | f956b838934ab06deeee2ce9d5c8dfe64e4beb24 (diff) | |
| download | linux-152f2d1def5e4b974947877126ff292a68a8c521.tar.xz | |
pwm: pxa: Set duty cycle to 0 when disabling PWM
When disabling PWM, the duty cycle needs to be set to 0. This prevents
the previous duty cycle from showing up momentarily when the clock is
re-enabled next time.
Because the clock has to be running in order to configure the duty
cycle, unconditionally enable it early in pxa_pwm_apply and account for
the correct enable count at the end.
Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Doug Brown <doug@schmorgal.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221113233639.24244-3-doug@schmorgal.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-pxa.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c index 0ac052652c62..9ee9b41d62b8 100644 --- a/drivers/pwm/pwm-pxa.c +++ b/drivers/pwm/pwm-pxa.c @@ -105,24 +105,31 @@ static int pxa_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip); + u64 duty_cycle; int err; if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; - if (!state->enabled) { - if (pwm->state.enabled) - clk_disable_unprepare(pc->clk); + err = clk_prepare_enable(pc->clk); + if (err) + return err; - return 0; - } + duty_cycle = state->enabled ? state->duty_cycle : 0; - err = pxa_pwm_config(chip, pwm, state->duty_cycle, state->period); - if (err) + err = pxa_pwm_config(chip, pwm, duty_cycle, state->period); + if (err) { + clk_disable_unprepare(pc->clk); return err; + } + + if (state->enabled && !pwm->state.enabled) + return 0; + + clk_disable_unprepare(pc->clk); - if (!pwm->state.enabled) - return clk_prepare_enable(pc->clk); + if (!state->enabled && pwm->state.enabled) + clk_disable_unprepare(pc->clk); return 0; } |