Messages in this thread Patch in this message | | | From | robert yang <> | Subject | [PATCH 1/1] Atmel-PWM: Fixed the PWM channel enable/disable issue which will cause the PWM output stop working after reenable. THe PWM channel status register is read to ensure the PWM channel is really enabled or disabled. | Date | Wed, 1 Oct 2014 15:08:30 -0600 |
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From: ryang <ryang@hach.com>
Signed-off-by: ryang <ryang@hach.com> --- drivers/pwm/pwm-atmel.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index 6e700a5..bab933a 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -237,7 +237,10 @@ static int atmel_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) } atmel_pwm_writel(atmel_pwm, PWM_ENA, 1 << pwm->hwpwm); - + while (!(atmel_pwm_readl(atmel_pwm, PWM_SR) & (1 << pwm->hwpwm))) { + atmel_pwm_writel(atmel_pwm, PWM_ENA, 1 << pwm->hwpwm); + cpu_relax(); + } return 0; } @@ -246,7 +249,10 @@ static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip); atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm); - + while (atmel_pwm_readl(atmel_pwm, PWM_SR) & (1 << pwm->hwpwm)) { + atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm); + cpu_relax(); + } clk_disable(atmel_pwm->clk); } -- 1.9.1
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