video: backlight: Drop maximum brightness override for brightness zero

The note in c2adda27d202f ("video: backlight: Add of_find_backlight helper in backlight.c") says that gpio-backlight uses brightness as power state. This has been fixed since in ec665b756e6f7 ("backlight: gpio-backlight:
Correct initial power state handling") and other backlight drivers do not require this workaround. Drop the workaround.

This fixes the case where e.g. pwm-backlight can perfectly well be set to brightness 0 on boot in DT, which without this patch leads to the display brightness to be max instead of off.

Fixes c2adda27d202f ("video: backlight: Add of_find_backlight helper in backlight.c")

Acked-by Noralf Trønnes <[email protected]>

Reviewed-by Daniel Thompson <[email protected]>

Cc <[email protected]> # 5.4+

Cc <[email protected]> # 4.19.x: ec665b756e6f7: backlight: gpio-backlight: Correct initial power state handling

Signed-off-by Marek Vasut <[email protected]>

Cc Daniel Thompson <[email protected]>

Cc Lee Jones <[email protected]>

Cc Meghana Madhyastha <[email protected]>

Cc Noralf Trønnes <[email protected]>

Cc Sean Paul <[email protected]>

Cc Thierry Reding <[email protected]>

---
V2: Add AB/RB, CC stable

---
 drivers/video/backlight/backlight.c | 6 ------
 1 file changed, 6 deletions(-)

drivers/video/backlight/backlight.c +0 -6

index 537fe1b376ad7..fc990e576340b 100644
@@ -688,12 +688,6 @@ static struct backlight_device *of_find_backlight(struct device *dev)
 			of_node_put(np);
 			if (!bd)
 				return ERR_PTR(-EPROBE_DEFER);
-			/*
-			 * Note: gpio_backlight uses brightness as
-			 * power state during probe
-			 */
-			if (!bd->props.brightness)
-				bd->props.brightness = bd->props.max_brightness;
 		}
 	}