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....@ingics.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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