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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 bit.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Axel Lin 2013-04-23 14:02:49 +08:00 committed by Thierry Reding
parent 08ee77b5a5
commit affb923df9
1 changed files with 5 additions and 2 deletions
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7
drivers/pwm/pwm-lpc32xx.c
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@ -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;
}