diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2022-04-08 17:22:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 18:32:31 +0200 |
| commit | 572211d631d7665c6690b5a6cb80436f8c368dc1 (patch) | |
| tree | 29eb79dbe6529fc88a3ef751fd06a5c594c3df9e /drivers/pwm | |
| parent | f9782b26d6f1134923d7232c82f06999ad0a09c7 (diff) | |
pwm: lp3943: Fix duty calculation in case period was clamped
[ 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>
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 bf3f14fb5f24..05e4120fd702 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); |