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From: Marek Vasut <marex@denx.de>
To: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org, "Marek Vasut" <marex@denx.de>,
	"Noralf Trønnes" <noralf@tronnes.org>,
	"Daniel Thompson" <daniel.thompson@linaro.org>,
	stable@vger.kernel.org,
	"Meghana Madhyastha" <meghana.madhyastha@gmail.com>,
	"Sean Paul" <seanpaul@chromium.org>,
	"Thierry Reding" <treding@nvidia.com>
Subject: [PATCH V2] video: backlight: Drop maximum brightness override for brightness zero
Date: Tue, 13 Jul 2021 21:16:33 +0200	[thread overview]
Message-ID: <20210713191633.121317-1-marex@denx.de> (raw)

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: 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(-)

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;
 		}
 	}
 
-- 
2.30.2


             reply	other threads:[~2021-07-13 19:16 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 19:16 Marek Vasut [this message]
2021-09-11 18:40 ` Marek Vasut
2021-09-21 13:33   ` Lee Jones
2021-09-21 17:31     ` Marek Vasut

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