linux-kernel - Re: [PATCH RESEND 1/4] backlight: aat2870: Use backlight helper

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Message-ID: <Y7hd91mh91B5bpyv@ravnborg.org>
Date:   Fri, 6 Jan 2023 18:44:23 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Stephen Kitt <steve@....org>
Cc:     Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, linux-fbdev@...r.kernel.org,
        Helge Deller <deller@....de>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH RESEND 1/4] backlight: aat2870: Use backlight helper

Hi Stephen,

On Fri, Jan 06, 2023 at 05:48:52PM +0100, 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@....org>
Nice cleanup.
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
> ---
>  drivers/video/backlight/aat2870_bl.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/video/backlight/aat2870_bl.c b/drivers/video/backlight/aat2870_bl.c
> index a7af9adafad6..1cbb303e9c88 100644
> --- a/drivers/video/backlight/aat2870_bl.c
> +++ b/drivers/video/backlight/aat2870_bl.c
> @@ -59,7 +59,7 @@ static int aat2870_bl_update_status(struct backlight_device *bd)
>  	struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd);
>  	struct aat2870_data *aat2870 =
>  			dev_get_drvdata(aat2870_bl->pdev->dev.parent);
> -	int brightness = bd->props.brightness;
> +	int brightness = backlight_get_brightness(bd);
>  	int ret;
>  
>  	if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
> @@ -70,11 +70,6 @@ static int aat2870_bl_update_status(struct backlight_device *bd)
>  	dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
>  		 bd->props.brightness, bd->props.power, bd->props.state);
>  
> -	if ((bd->props.power != FB_BLANK_UNBLANK) ||
> -			(bd->props.state & BL_CORE_FBBLANK) ||
> -			(bd->props.state & BL_CORE_SUSPENDED))
> -		brightness = 0;
> -
>  	ret = aat2870->write(aat2870, AAT2870_BLM,
>  			     (u8)aat2870_brightness(aat2870_bl, brightness));
>  	if (ret < 0)
> -- 
> 2.30.2