| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.17 018/298] pwm: lp3943: Fix duty calculation in case period was clamped | Date | Mon, 13 Jun 2022 12:08:32 +0200 |
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From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[ Upstream commit 5e3b07ca5cc78cd4a987e78446849e41288d87cb ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/pwm/pwm-lp3943.c | 1 + 1 file changed, 1 insertion(+)
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); -- 2.35.1
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