From: Uwe Kleine-König Date: Fri, 8 Apr 2022 15:22:38 +0000 (+0200) Subject: pwm: lp3943: Fix duty calculation in case period was clamped X-Git-Tag: v6.1-rc5~1195^2~32 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5e3b07ca5cc78cd4a987e78446849e41288d87cb;p=platform%2Fkernel%2Flinux-starfive.git 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 Signed-off-by: Thierry Reding --- diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c index ea17d446..2bd04ec 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);