Re: [PATCH] drm/bridge: parade-ps8622: Use backlight helper

[Stephen Kitt <steve@sk2.org>]

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On Tue,  7 Jun 2022 20:10:22 +0200, Stephen Kitt <steve@sk2.org> wrote:
> backlight_properties.fb_blank is deprecated. The states it represents
> are handled by other properties; but instead of accessing those
> properties directly, drivers should use the helpers provided by
> backlight.h.

Apologies for the misleading boilerplate, this patch came about as a result
of cleaning up fb_blank usage but doesn't involve fb_blank itself.

> 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: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Cc: Robert Foss <robert.foss@linaro.org>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: dri-devel@lists.freedesktop.org
> ---
>  drivers/gpu/drm/bridge/parade-ps8622.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c
> b/drivers/gpu/drm/bridge/parade-ps8622.c index 37b308850b4e..b5750e5f71d7
> 100644 --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> @@ -324,11 +324,7 @@ static int ps8622_send_config(struct ps8622_bridge
> *ps8622) static int ps8622_backlight_update(struct backlight_device *bl)
>  {
>  	struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
> -	int ret, brightness = bl->props.brightness;
> -
> -	if (bl->props.power != FB_BLANK_UNBLANK ||
> -	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
> -		brightness = 0;
> +	int ret, brightness = backlight_get_brightness(bl);
>  
>  	if (!ps8622->enabled)
>  		return -EINVAL;
> 
> base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56
> -- 
> 2.30.2
> 

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