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@xxxxxxxxx>
Tested-by: Markus Hofstaetter <markus.hofstaetter@xxxxxxxxx>
---
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 1d07e3e..3149dbe 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);
--
1.9.1
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