From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Fri, 12 Mar 2021 08:59:16 +0000 (+0100)
Subject: pwm: sprd: Refuse requests with unsupported polarity
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=09081c9ba6c22bd63b6ce681e60d71a95acbc115;p=linux.git

pwm: sprd: Refuse requests with unsupported polarity

The driver only supports normal polarity and so should refuse requests
for inversed polarity.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
---

diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c
index 108cbec88667b..98c479dfae318 100644
--- a/drivers/pwm/pwm-sprd.c
+++ b/drivers/pwm/pwm-sprd.c
@@ -164,6 +164,9 @@ static int sprd_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct pwm_state *cstate = &pwm->state;
 	int ret;
 
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
 	if (state->enabled) {
 		if (!cstate->enabled) {
 			/*