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authorUwe Kleine-König2022-04-08 17:22:38 +0200
committerThierry Reding2022-04-22 18:42:53 +0200
commit5e3b07ca5cc78cd4a987e78446849e41288d87cb (patch)
tree5267329a50f30417a3cca03a7a519b0e1037216a
parentb3c4af8507a052c231084d7e2c1cc5fa5a8c245a (diff)
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>
-rw-r--r--drivers/pwm/pwm-lp3943.c1
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);