From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Wed, 11 May 2022 07:58:56 +0000 (+0200)
Subject: gpio: mvebu/pwm: Refuse requests with inverted polarity
X-Git-Tag: v4.19.245~10
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=bc27956777f7e1c1050d19c3a5d76f52bb931399;p=thirdparty%2Fkernel%2Fstable.git

gpio: mvebu/pwm: Refuse requests with inverted polarity

[ 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: 757642f9a584 ("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>
---

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index 874caed723905..199b96967ca20 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -690,6 +690,9 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	unsigned long flags;
 	unsigned int on, off;
 
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
 	val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
 	do_div(val, NSEC_PER_SEC);
 	if (val > UINT_MAX)