diff options
| author | Axel Lin <axel.lin@ingics.com> | 2013-04-23 14:02:49 +0800 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@avionic-design.de> | 2013-04-23 10:58:47 +0200 |
| commit | affb923df96d6c927f9a3dfb0e6f4be940b185cd (patch) | |
| tree | 3f1c654c95946c04e465ab230fa5e61c30bb9dd8 /drivers | |
| parent | 08ee77b5a5de27ad63c92262ebcb4efe0da93b58 (diff) | |
| download | linux-affb923df96d6c927f9a3dfb0e6f4be940b185cd.tar.gz | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/pwm-lpc32xx.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c index 6b6272f61da5..8272883c0d05 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; } |