This is a note to let you know that I've just added the patch titled
video: backlight: Drop maximum brightness override for brightness zero
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
video-backlight-drop-maximum-brightness-override-for-brightness-zero.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 33a5471f8da976bf271a1ebbd6b9d163cb0cb6aa Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@xxxxxxx>
Date: Tue, 21 Sep 2021 19:35:06 +0200
Subject: video: backlight: Drop maximum brightness override for brightness zero
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From: Marek Vasut <marex@xxxxxxx>
commit 33a5471f8da976bf271a1ebbd6b9d163cb0cb6aa upstream.
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")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.4+
Cc: <stable@xxxxxxxxxxxxxxx> # 4.19.x: ec665b756e6f7: backlight: gpio-backlight: Correct initial power state handling
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Acked-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
Reviewed-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/video/backlight/backlight.c | 6 ------
1 file changed, 6 deletions(-)
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -688,12 +688,6 @@ static struct backlight_device *of_find_
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;
}
}
Patches currently in stable-queue which might be from marex@xxxxxxx are
queue-5.15/rsi-fix-module-dev_oper_mode-parameter-description.patch
queue-5.15/arm-dts-stm32-reduce-dhcor-spi-nor-frequency-to-50-m.patch
queue-5.15/arm-dts-stm32-fix-av96-board-sai2-pin-muxing-on-stm3.patch
queue-5.15/video-backlight-drop-maximum-brightness-override-for-brightness-zero.patch
