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pwm: lp3943: Fix duty calculation in case period was clamped
[ Upstream commit5e3b07ca5c
] 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:af66b3c093
("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>
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@ -128,6 +128,7 @@ static int lp3943_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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if (err)
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return err;
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duty_ns = min(duty_ns, period_ns);
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val = (u8)(duty_ns * LP3943_MAX_DUTY / period_ns);
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return lp3943_write_byte(lp3943, reg_duty, val);
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