From a2c4ef097774e70f0afc4ab25f53b769c6da3397 Mon Sep 17 00:00:00 2001 From: Marc Dietrich Date: Tue, 2 Jul 2019 22:08:33 +0200 Subject: [PATCH] video: backlight: fix pwm inversion set_pwm() will always fail with -ENOSYS if pwm_ops set_invert() is not implemented, leaving the backlight dark. Fix this by returning no error if set_invert() is not implemented and no polarity change is requested. Fixes: 57e7775413 ("video: backlight: Parse PWM polarity cell") Signed-off-by: Marc Dietrich --- drivers/video/pwm_backlight.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c index a587977c22..ad20bf2441 100644 --- a/drivers/video/pwm_backlight.c +++ b/drivers/video/pwm_backlight.c @@ -67,6 +67,9 @@ static int set_pwm(struct pwm_backlight_priv *priv) return log_ret(ret); ret = pwm_set_invert(priv->pwm, priv->channel, priv->polarity); + if (ret == -ENOSYS && !priv->polarity) + ret = 0; + return log_ret(ret); } -- 2.39.5