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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2022-04-08 18:22:38 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2022-04-22 19:42:53 +0300 |
| commit | 5e3b07ca5cc78cd4a987e78446849e41288d87cb (patch) | |
| tree | 5267329a50f30417a3cca03a7a519b0e1037216a /drivers/pwm | |
| parent | b3c4af8507a052c231084d7e2c1cc5fa5a8c245a (diff) | |
| download | linux-5e3b07ca5cc78cd4a987e78446849e41288d87cb.tar.xz | |
pwm: lp3943: Fix duty calculation in case period was clamped
The hardware only supports periods <= 1.6 ms and if a bigger period is
requested it is clamped to 1.6 ms. In this case duty_cycle might be bigger
than 1.6 ms and then the duty cycle register is written with a value
bigger than LP3943_MAX_DUTY. So clamp duty_cycle accordingly.
Fixes: af66b3c0934e ("pwm: Add LP3943 PWM driver")
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-lp3943.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c index ea17d446a627..2bd04ecb508c 100644 --- a/drivers/pwm/pwm-lp3943.c +++ b/drivers/pwm/pwm-lp3943.c @@ -125,6 +125,7 @@ static int lp3943_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, if (err) return err; + duty_ns = min(duty_ns, period_ns); val = (u8)(duty_ns * LP3943_MAX_DUTY / period_ns); return lp3943_write_byte(lp3943, reg_duty, val); |