From: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Date: Tue, 11 Mar 2025 22:11:47 +0000 (+0100)
Subject: pwm: tegra: fix pulse_width calculation
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2fcb08a2b477667741f194b8b8a8a08a711dc974;p=thirdparty%2Fu-boot.git

pwm: tegra: fix pulse_width calculation

The pulse_width is expressed as N/256. A 100% duty cycle is only possible
when multiplied by 256 instead of 255.

Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---

diff --git a/drivers/pwm/tegra_pwm.c b/drivers/pwm/tegra_pwm.c
index 4b57751f73f..4bbfeba8d98 100644
--- a/drivers/pwm/tegra_pwm.c
+++ b/drivers/pwm/tegra_pwm.c
@@ -40,7 +40,7 @@ static int tegra_pwm_set_config(struct udevice *dev, uint channel,
 		return -EINVAL;
 	debug("%s: Configure '%s' channel %u\n", __func__, dev->name, channel);
 
-	pulse_width = duty_ns * 255 / period_ns;
+	pulse_width = duty_ns * 256 / period_ns;
 
 	if (priv->polarity & BIT(channel))
 		pulse_width = 256 - pulse_width;