Re: [PATCH 4/4] backlight: tosa: Use backlight helper

[Daniel Thompson <daniel.thompson@linaro.org>]

On Tue, Jun 07, 2022 at 09:09:25PM +0200, Stephen Kitt wrote:
> Instead of retrieving the backlight brightness in struct
> backlight_properties manually, and then checking whether the backlight
> should be on at all, use backlight_get_brightness() which does all
> this and insulates this from future changes.
> 
> Signed-off-by: Stephen Kitt <steve@sk2.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Helge Deller <deller@gmx.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-fbdev@vger.kernel.org

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>

... and, wowzer, the code before your change wasn't much fun to read!


>  static int tosa_bl_update_status(struct backlight_device *dev)
>  {
> -	struct backlight_properties *props = &dev->props;
>  	struct tosa_bl_data *data = bl_get_data(dev);
> -	int power = max(props->power, props->fb_blank);
> -	int brightness = props->brightness;
> -
> -	if (power)
> -		brightness = 0;
> +	int brightness = backlight_get_brightness(dev);
>  
>  	tosa_bl_set_backlight(data, brightness);


Daniel.