linux-kernel - Re: [PATCH RESEND 2/4] backlight: arcxcnn: Use backlight helper

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Date:   Fri, 6 Jan 2023 18:44:49 +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 2/4] backlight: arcxcnn: Use backlight helper

On Fri, Jan 06, 2023 at 05:48:53PM +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>
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
> ---
>  drivers/video/backlight/arcxcnn_bl.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/video/backlight/arcxcnn_bl.c b/drivers/video/backlight/arcxcnn_bl.c
> index 555b036643fb..e610d7a1d13d 100644
> --- a/drivers/video/backlight/arcxcnn_bl.c
> +++ b/drivers/video/backlight/arcxcnn_bl.c
> @@ -130,12 +130,9 @@ static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness)
>  static int arcxcnn_bl_update_status(struct backlight_device *bl)
>  {
>  	struct arcxcnn *lp = bl_get_data(bl);
> -	u32 brightness = bl->props.brightness;
> +	u32 brightness = backlight_get_brightness(bl);
>  	int ret;
>  
> -	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> -		brightness = 0;
> -
>  	ret = arcxcnn_set_brightness(lp, brightness);
>  	if (ret)
>  		return ret;
> -- 
> 2.30.2