linux-kernel - Re: [PATCH v2 3/3] drm/panel: sony-acx565akm: Use backlight helpers

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Message-ID: <20220617100841.dk2txmttdi5iccvi@mercury.elektranox.org>
Date:   Fri, 17 Jun 2022 12:08:41 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Stephen Kitt <steve@....org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] drm/panel: sony-acx565akm: Use backlight helpers

Hi,

On Thu, Jun 16, 2022 at 07:23:15PM +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.
> 
> Instead of manually checking the power state in struct
> backlight_properties, use backlight_is_blank().
> 
> While we're at it, drop .fb_blank from the initialisation function; it
> is deprecated, and this helps make progress towards enabling its
> removal. This change makes no functional difference since
> FB_BLANK_UNBLANK is the default value.
> 
> Signed-off-by: Stephen Kitt <steve@....org>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org
> ---
> Changes since v1: removed the last remaining .fb_blank reference
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

>  drivers/gpu/drm/panel/panel-sony-acx565akm.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sony-acx565akm.c b/drivers/gpu/drm/panel/panel-sony-acx565akm.c
> index 0d7541a33f87..3d6a286056a0 100644
> --- a/drivers/gpu/drm/panel/panel-sony-acx565akm.c
> +++ b/drivers/gpu/drm/panel/panel-sony-acx565akm.c
> @@ -298,13 +298,7 @@ static void acx565akm_set_brightness(struct acx565akm_panel *lcd, int level)
>  static int acx565akm_bl_update_status_locked(struct backlight_device *dev)
>  {
>  	struct acx565akm_panel *lcd = dev_get_drvdata(&dev->dev);
> -	int level;
> -
> -	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
> -	    dev->props.power == FB_BLANK_UNBLANK)
> -		level = dev->props.brightness;
> -	else
> -		level = 0;
> +	int level = backlight_get_brightness(dev);
>  
>  	acx565akm_set_brightness(lcd, level);
>  
> @@ -330,8 +324,7 @@ static int acx565akm_bl_get_intensity(struct backlight_device *dev)
>  
>  	mutex_lock(&lcd->mutex);
>  
> -	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
> -	    dev->props.power == FB_BLANK_UNBLANK)
> +	if (!backlight_is_blank(dev))
>  		intensity = acx565akm_get_actual_brightness(lcd);
>  	else
>  		intensity = 0;
> @@ -349,7 +342,6 @@ static const struct backlight_ops acx565akm_bl_ops = {
>  static int acx565akm_backlight_init(struct acx565akm_panel *lcd)
>  {
>  	struct backlight_properties props = {
> -		.fb_blank = FB_BLANK_UNBLANK,
>  		.power = FB_BLANK_UNBLANK,
>  		.type = BACKLIGHT_RAW,
>  	};
> -- 
> 2.30.2
> 

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