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gpio: mvebu/pwm: Refuse requests with inverted polarity

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[ Upstream commit 3ecb10175b1f776f076553c24e2689e42953fef5 ]

The driver doesn't take struct pwm_state::polarity into account when
configuring the hardware, so refuse requests for inverted polarity.

Fixes: 757642f9a5 ("gpio: mvebu: Add limited PWM support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2022-05-11 09:58:56 +02:00 committed by Greg Kroah-Hartman
parent 30d4721fec
commit 210ea7da5c
1 changed files with 3 additions and 0 deletions
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3
drivers/gpio/gpio-mvebu.c
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@ -700,6 +700,9 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long flags; unsigned long flags;
unsigned int on, off; unsigned int on, off;
if (state->polarity != PWM_POLARITY_NORMAL)
return -EINVAL;
val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle; val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
do_div(val, NSEC_PER_SEC); do_div(val, NSEC_PER_SEC);
if (val > UINT_MAX) if (val > UINT_MAX)