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From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Claudiu Beznea <claudiu.beznea@microchip.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Lee Jones <lee.jones@linaro.org>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	linux-arm-kernel@lists.infradead.org, linux-pwm@vger.kernel.org
Subject: [PATCH] pwm: atmel: Fix duty cycle calculation in .get_state()
Date: Sun, 18 Apr 2021 22:57:47 +0200	[thread overview]
Message-ID: <20210418205747.1488248-1-uwe@kleine-koenig.org> (raw)

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 <uwe@kleine-koenig.org>
---
 drivers/pwm/pwm-atmel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index d49da708337f..c30a0dac4b2d 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)(cdty - cprd) * NSEC_PER_SEC;
 		tmp <<= pres;
 		state->duty_cycle = DIV64_U64_ROUND_UP(tmp, rate);
 
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Claudiu Beznea <claudiu.beznea@microchip.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Lee Jones <lee.jones@linaro.org>
Cc: linux-pwm@vger.kernel.org,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] pwm: atmel: Fix duty cycle calculation in .get_state()
Date: Sun, 18 Apr 2021 22:57:47 +0200	[thread overview]
Message-ID: <20210418205747.1488248-1-uwe@kleine-koenig.org> (raw)

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 <uwe@kleine-koenig.org>
---
 drivers/pwm/pwm-atmel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index d49da708337f..c30a0dac4b2d 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)(cdty - cprd) * NSEC_PER_SEC;
 		tmp <<= pres;
 		state->duty_cycle = DIV64_U64_ROUND_UP(tmp, rate);
 
-- 
2.30.2


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             reply	other threads:[~2021-04-18 20:57 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-18 20:57 Uwe Kleine-König [this message]
2021-04-18 20:57 ` [PATCH] pwm: atmel: Fix duty cycle calculation in .get_state() Uwe Kleine-König
2021-04-19 19:29 ` Uwe Kleine-König
2021-04-19 19:29   ` Uwe Kleine-König

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