File 0016-Revert-video-backlight-fix-pwm-s-du.patch of Package u-boot.37698

From 30b758689c60de57a3e55276a78a37974f43047a Mon Sep 17 00:00:00 2001
From: Guillaume Gardet <guillaume.gardet@arm.com>
Date: Thu, 21 Oct 2021 15:20:10 +0200
Subject: [PATCH] Revert "video: backlight: fix pwm's duty cycle calculation"

This reverts commit 76c2ff3e5fd8068b433acbb0e76d33fa5116dade.

This fixes backlight on Chromebook snow - boo#1187573
---
 drivers/video/pwm_backlight.c |  2 +-
 test/dm/panel.c               | 12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c
index d7c096923b..2f3a68ba87 100644
--- a/drivers/video/pwm_backlight.c
+++ b/drivers/video/pwm_backlight.c
@@ -64,7 +64,7 @@ static int set_pwm(struct pwm_backlight_priv *priv)
 
 	if (priv->period_ns) {
 		duty_cycle = priv->period_ns * (priv->cur_level - priv->min_level) /
-			(priv->max_level - priv->min_level);
+			(priv->max_level - priv->min_level + 1);
 		ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,
 				     duty_cycle);
 	} else {
diff --git a/test/dm/panel.c b/test/dm/panel.c
index 4d435a0d25..9229c7f4ea 100644
--- a/test/dm/panel.c
+++ b/test/dm/panel.c
@@ -40,7 +40,7 @@ static int dm_test_panel(struct unit_test_state *uts)
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
 	ut_asserteq(1000, period_ns);
-	ut_asserteq(170 * 1000 / 255, duty_ns);
+	ut_asserteq(170 * 1000 / 256, duty_ns);
 	ut_asserteq(true, enable);
 	ut_asserteq(false, polarity);
 	ut_asserteq(1, sandbox_gpio_get_value(gpio, 1));
@@ -49,29 +49,29 @@ static int dm_test_panel(struct unit_test_state *uts)
 	ut_assertok(panel_set_backlight(dev, 40));
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
-	ut_asserteq(64 * 1000 / 255, duty_ns);
+	ut_asserteq(64 * 1000 / 256, duty_ns);
 
 	ut_assertok(panel_set_backlight(dev, BACKLIGHT_MAX));
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
-	ut_asserteq(255 * 1000 / 255, duty_ns);
+	ut_asserteq(255 * 1000 / 256, duty_ns);
 
 	ut_assertok(panel_set_backlight(dev, BACKLIGHT_MIN));
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
-	ut_asserteq(0 * 1000 / 255, duty_ns);
+	ut_asserteq(0 * 1000 / 256, duty_ns);
 	ut_asserteq(1, sandbox_gpio_get_value(gpio, 1));
 
 	ut_assertok(panel_set_backlight(dev, BACKLIGHT_DEFAULT));
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
 	ut_asserteq(true, enable);
-	ut_asserteq(170 * 1000 / 255, duty_ns);
+	ut_asserteq(170 * 1000 / 256, duty_ns);
 
 	ut_assertok(panel_set_backlight(dev, BACKLIGHT_OFF));
 	ut_assertok(sandbox_pwm_get_config(pwm, 0, &period_ns, &duty_ns,
 					   &enable, &polarity));
-	ut_asserteq(0 * 1000 / 255, duty_ns);
+	ut_asserteq(0 * 1000 / 256, duty_ns);
 	ut_asserteq(0, sandbox_gpio_get_value(gpio, 1));
 	ut_asserteq(false, regulator_get_enable(reg));