From: Markus Hofstaetter markus.hofstaetter@ait.ac.at
commit f16703360da7731a057df2ffa902306819c22398 upstream.
Some PWMs are disabled by default or the default pin setting does not match the LED_OFF state (e.g., active-low leds). Hence, the driver may end up reporting 0 brightness, but the leds are actually on using full brightness, because it never enforces its default configuration. So enforce it by calling led_pwm_set() after successfully registering the device.
Tested on a Phytec phyFLEX i.MX6Q board based on kernel v3.19.5.
Signed-off-by: Markus Hofstaetter markus.hofstaetter@ait.ac.at Tested-by: Markus Hofstaetter markus.hofstaetter@ait.ac.at Signed-off-by: Jacek Anaszewski j.anaszewski@samsung.com Signed-off-by: Krzysztof Kozlowski krzk@kernel.org --- drivers/leds/leds-pwm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 1d07e3e83d29..3149dbece146 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -132,6 +132,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, ret = led_classdev_register(dev, &led_data->cdev); if (ret == 0) { priv->num_leds++; + led_pwm_set(&led_data->cdev, led_data->cdev.brightness); } else { dev_err(dev, "failed to register PWM led for %s: %d\n", led->name, ret);