[PATCH v2] backlight: led_bl: fix initial power state

[PATCH v2] backlight: led_bl: fix initial power state

[Mans Rullgard]

The condition for the initial power state based on the default
brightness value is reversed.  Fix it.

Furthermore, use the actual state of the LEDs rather than the default
brightness specified in the devicetree as the latter should not cause
the backlight to be automatically turned on.

If the backlight device is not linked to any display, set the initial
power to on unconditionally.

Fixes: ae232e45acf9 ("backlight: add led-backlight driver")
Signed-off-by: Mans Rullgard <mans@mansr.com>
---
Changes in v2:
- Use the reported LED state to set initial power state
- Always power on if no phandle in DT
---
 drivers/video/backlight/led_bl.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index 3259292fda76..bbf1673b1fb0 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -176,6 +176,7 @@ static int led_bl_probe(struct platform_device *pdev)
 {
 	struct backlight_properties props;
 	struct led_bl_data *priv;
+	int init_brightness;
 	int ret, i;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -190,6 +191,8 @@ static int led_bl_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	init_brightness = priv->default_brightness;
+
 	ret = led_bl_parse_levels(&pdev->dev, priv);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to parse DT data\n");
@@ -200,8 +203,8 @@ static int led_bl_probe(struct platform_device *pdev)
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = priv->max_brightness;
 	props.brightness = priv->default_brightness;
-	props.power = (priv->default_brightness > 0) ? FB_BLANK_POWERDOWN :
-		      FB_BLANK_UNBLANK;
+	props.power = (init_brightness || !pdev->dev.of_node->phandle) ?
+		FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 	priv->bl_dev = backlight_device_register(dev_name(&pdev->dev),
 			&pdev->dev, priv, &led_bl_ops, &props);
 	if (IS_ERR(priv->bl_dev)) {
-- 
2.41.0

Re: [PATCH v2] backlight: led_bl: fix initial power state

[Daniel Thompson]

On Tue, Jul 04, 2023 at 05:19:52PM +0100, Mans Rullgard wrote:
> The condition for the initial power state based on the default
> brightness value is reversed.  Fix it.
>
> Furthermore, use the actual state of the LEDs rather than the default
> brightness specified in the devicetree as the latter should not cause
> the backlight to be automatically turned on.
>
> If the backlight device is not linked to any display, set the initial
> power to on unconditionally.
>
> Fixes: ae232e45acf9 ("backlight: add led-backlight driver")
> Signed-off-by: Mans Rullgard <mans@mansr.com>
> ---
> Changes in v2:
> - Use the reported LED state to set initial power state
> - Always power on if no phandle in DT
> ---
>  drivers/video/backlight/led_bl.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> index 3259292fda76..bbf1673b1fb0 100644
> --- a/drivers/video/backlight/led_bl.c
> +++ b/drivers/video/backlight/led_bl.c
> @@ -176,6 +176,7 @@ static int led_bl_probe(struct platform_device *pdev)
>  {
>  	struct backlight_properties props;
>  	struct led_bl_data *priv;
> +	int init_brightness;
>  	int ret, i;
>
>  	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> @@ -190,6 +191,8 @@ static int led_bl_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>
> +	init_brightness = priv->default_brightness;
> +
>  	ret = led_bl_parse_levels(&pdev->dev, priv);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "Failed to parse DT data\n");
> @@ -200,8 +203,8 @@ static int led_bl_probe(struct platform_device *pdev)
>  	props.type = BACKLIGHT_RAW;
>  	props.max_brightness = priv->max_brightness;
>  	props.brightness = priv->default_brightness;
> -	props.power = (priv->default_brightness > 0) ? FB_BLANK_POWERDOWN :
> -		      FB_BLANK_UNBLANK;
> +	props.power = (init_brightness || !pdev->dev.of_node->phandle) ?
> +		FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;

I was rather expecting to see a comment in the code here... it's super
hard to figure out the purpose of the phandle check otherwise.


Daniel.