On Tue, 21 Sep 2021, Marek Vasut wrote:

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 noralf@tronnes.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org Cc: stable@vger.kernel.org # 5.4+ Cc: stable@vger.kernel.org # 4.19.x: ec665b756e6f7: backlight: gpio-backlight: Correct initial power state handling Signed-off-by: Marek Vasut marex@denx.de Cc: Daniel Thompson daniel.thompson@linaro.org Cc: Lee Jones lee.jones@linaro.org Cc: Meghana Madhyastha meghana.madhyastha@gmail.com Cc: Noralf Trønnes noralf@tronnes.org Cc: Sean Paul seanpaul@chromium.org Cc: Thierry Reding treding@nvidia.com

---

V2: Add AB/RB, CC stable

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

Applied with some changes to the sign-off block, thanks.

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 537fe1b376ad7..fc990e576340b 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -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;
  

  } }