diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/pwm-atmel.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index 0e4bd4e8e582..f3df529737f2 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -271,6 +271,16 @@ static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) mutex_unlock(&atmel_pwm->isr_lock); atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm); + /* + * Wait for the PWM channel disable operation to be effective before + * stopping the clock. + */ + timeout = jiffies + 2 * HZ; + + while ((atmel_pwm_readl(atmel_pwm, PWM_SR) & (1 << pwm->hwpwm)) && + time_before(jiffies, timeout)) + usleep_range(10, 100); + clk_disable(atmel_pwm->clk); } |