linux-kernel - [RFT][PATCH v2 2/2] pwm: lpc32xx: Don't change PWM_ENABLE bit in lpc32xx_pwm

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Message-ID: <1364660697.17470.1.camel@phoenix>
Date:	Sun, 31 Mar 2013 00:24:57 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	Alexandre Pereira da Silva <aletes.xgr@...il.com>,
	Roland Stigge <stigge@...com.de>, linux-kernel@...r.kernel.org
Subject: [RFT][PATCH v2 2/2] pwm: lpc32xx: Don't change PWM_ENABLE bit in
 lpc32xx_pwm_config

lpc32xx_pwm_config() is supposed to set duty_ns and period_ns,
it should not change PWM_ENABLE and other bits.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/pwm/pwm-lpc32xx.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index 1a5075e..e936202 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -37,6 +37,7 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct lpc32xx_pwm_chip *lpc32xx = to_lpc32xx_pwm_chip(chip);
 	unsigned long long c;
 	int period_cycles, duty_cycles;
+	u32 val;
 
 	c = clk_get_rate(lpc32xx->clk) / 256;
 	c = c * period_ns;
@@ -68,8 +69,10 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		c = 255;
 	duty_cycles = 256 - c;
 
-	writel(PWM_ENABLE | PWM_RELOADV(period_cycles) | PWM_DUTY(duty_cycles),
-		lpc32xx->base + (pwm->hwpwm << 2));
+	val = readl(lpc32xx->base + (pwm->hwpwm << 2));
+	val &= ~0xFFFF;
+	val |= PWM_RELOADV(period_cycles) | PWM_DUTY(duty_cycles);
+	writel(val, lpc32xx->base + (pwm->hwpwm << 2));
 
 	return 0;
 }
-- 
1.7.10.4



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