From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Tue, 20 Apr 2021 09:51:17 +0000 (+0200)
Subject: pwm: atmel: Fix duty cycle calculation in .get_state()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=453e8b3d8e36ddcb283b3d1698864a03ea45599a;p=linux.git

pwm: atmel: Fix duty cycle calculation in .get_state()

The CDTY register contains the number of inactive cycles. .apply() does
this correctly, however .get_state() got this wrong.

Fixes: 651b510a74d4 ("pwm: atmel: Implement .get_state()")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
---

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index d49da708337fa..ebaeb50dcfde2 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -319,7 +319,7 @@ static void atmel_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 
 		cdty = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm,
 					  atmel_pwm->data->regs.duty);
-		tmp = (u64)cdty * NSEC_PER_SEC;
+		tmp = (u64)(cprd - cdty) * NSEC_PER_SEC;
 		tmp <<= pres;
 		state->duty_cycle = DIV64_U64_ROUND_UP(tmp, rate);