From a2c4ef097774e70f0afc4ab25f53b769c6da3397 Mon Sep 17 00:00:00 2001
From: Marc Dietrich <marvin24@gmx.de>
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 <marvin24@gmx.de>
---
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