[PATCH] Enable backlight when trigger is activated

From: Pavel Machek <pavel@ucw.cz>
To: kernel list <linux-kernel@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-omap@vger.kernel.org, tony@atomide.com, sre@kernel.org,
	nekit1000@gmail.com, mpartap@gmx.net, merlijn@wizzup.org,
	jacek.anaszewski@gmail.com, linux-leds@vger.kernel.org,
	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org
Subject: [PATCH] Enable backlight when trigger is activated
Date: Thu, 18 Jul 2019 21:08:49 +0200	[thread overview]
Message-ID: <20190718190849.GA11409@amd> (raw)

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Configuring backlight trigger from dts results in backlight off during
boot. Machine looks dead upon boot, which is not good.

Fix that by enabling LED on trigger activation.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
index 487577d..6e6bc78 100644
--- a/drivers/leds/trigger/ledtrig-backlight.c
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -114,6 +114,8 @@ static int bl_trig_activate(struct led_classdev *led)
 	n->old_status = UNBLANK;
 	n->notifier.notifier_call = fb_notifier_callback;
 
+	led_set_brightness(led, LED_ON);
+
 	ret = fb_register_client(&n->notifier);
 	if (ret)
 		dev_err(led->dev, "unable to register backlight trigger\n");
@@ -126,6 +128,7 @@ static void bl_trig_deactivate(struct led_classdev *led)
 	struct bl_trig_notifier *n = led_get_trigger_data(led);
 
 	fb_unregister_client(&n->notifier);
+	led_set_brightness(led, LED_OFF);
 	kfree(n);
 }
 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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