linux-kernel - Re: [PATCH v2 2/3] drm/panel: panel-dsi-cm: Use backlight helpers

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Message-ID: <20220617100658.6xnb6z6nsubhcm6q@mercury.elektranox.org>
Date:   Fri, 17 Jun 2022 12:06:58 +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 2/3] drm/panel: panel-dsi-cm: Use backlight helpers

Hi,

On Thu, Jun 16, 2022 at 07:23:14PM +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 setting the power state by manually updating fields in
> struct backlight_properties, use backlight_enable() and
> backlight_disable(). These also call backlight_update_status() so the
> separate call is no longer needed.
> 
> 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 unnecessary parentheses
> ---

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

-- Sebastian

>  drivers/gpu/drm/panel/panel-dsi-cm.c | 29 ++++++----------------------
>  1 file changed, 6 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-dsi-cm.c b/drivers/gpu/drm/panel/panel-dsi-cm.c
> index b58cb064975f..b0213a518f9d 100644
> --- a/drivers/gpu/drm/panel/panel-dsi-cm.c
> +++ b/drivers/gpu/drm/panel/panel-dsi-cm.c
> @@ -85,17 +85,10 @@ static void dsicm_bl_power(struct panel_drv_data *ddata, bool enable)
>  	else
>  		return;
>  
> -	if (enable) {
> -		backlight->props.fb_blank = FB_BLANK_UNBLANK;
> -		backlight->props.state = ~(BL_CORE_FBBLANK | BL_CORE_SUSPENDED);
> -		backlight->props.power = FB_BLANK_UNBLANK;
> -	} else {
> -		backlight->props.fb_blank = FB_BLANK_NORMAL;
> -		backlight->props.power = FB_BLANK_POWERDOWN;
> -		backlight->props.state |= BL_CORE_FBBLANK | BL_CORE_SUSPENDED;
> -	}
> -
> -	backlight_update_status(backlight);
> +	if (enable)
> +		backlight_enable(backlight);
> +	else
> +		backlight_disable(backlight);
>  }
>  
>  static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
> @@ -196,13 +189,7 @@ static int dsicm_bl_update_status(struct backlight_device *dev)
>  {
>  	struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
>  	int r = 0;
> -	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);
>  
>  	dev_dbg(&ddata->dsi->dev, "update brightness to %d\n", level);
>  
> @@ -219,11 +206,7 @@ static int dsicm_bl_update_status(struct backlight_device *dev)
>  
>  static int dsicm_bl_get_intensity(struct backlight_device *dev)
>  {
> -	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
> -			dev->props.power == FB_BLANK_UNBLANK)
> -		return dev->props.brightness;
> -
> -	return 0;
> +	return backlight_get_brightness(dev);
>  }
>  
>  static const struct backlight_ops dsicm_bl_ops = {
> -- 
> 2.30.2
> 

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