[U-Boot] [PATCH] video: backlight: fix pwm invertation

[Marc Dietrich]

Fixes: 57e7775413 ("video: backlight: Parse PWM polarity cell")

set_pwm will always fail if pwm_set_invert is not implemented, leaving the
backlight dark. Fix this by calling pwm_set_invert only if pwm is inverted.

Signed-off-by: Marc Dietrich <marvin24 at gmx.de>
---
 drivers/video/pwm_backlight.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c
index a587977c22..26bcbeb42b 100644
--- a/drivers/video/pwm_backlight.c
+++ b/drivers/video/pwm_backlight.c
@@ -61,12 +61,13 @@ static int set_pwm(struct pwm_backlight_priv *priv)

 	duty_cycle = priv->period_ns * (priv->cur_level - priv->min_level) /
 		(priv->max_level - priv->min_level + 1);
+
 	ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,
 			     duty_cycle);
-	if (ret)
-		return log_ret(ret);

-	ret = pwm_set_invert(priv->pwm, priv->channel, priv->polarity);
+	if (!ret && priv->polarity)
+		ret = pwm_set_invert(priv->pwm, priv->channel, priv->polarity);
+
 	return log_ret(ret);
 }

--
2.17.1