Hello, Thanks for your answer.
I'm seeing the problem with the version 3.10-at91. I tried with the newer version of the driver which add the 916030db4399 commit and I have the same bug. 2014-06-04 16:46 GMT+02:00 Thierry Reding <[email protected]>: > Adding in the linux-pwm mailing list. > > On Wed, Jun 04, 2014 at 02:56:13PM +0200, Raphaël Poggi wrote: >> Hello, >> >> I'm using the pwm-atmel driver to control led, but i'm facing a problem. >> >> When writing "echo 0 > /sys/class/leds/d1/brightness" (to switch off >> the led) sometimes the led stayed active. >> >> After investigation I think this problem is due to this function: >> >> 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); >> >> clk_disable(atmel_pwm->clk); >> } >> >> By disable the pwm channel, I think the duty cycle "0" has not been >> update, and the channel is disable and stayed in active state (high or >> low depending of polarity). > > This sounds like a bug that could be fixed by this commit: > > 916030db4399 pwm: atmel: correct CDTY calculation > > What version of the kernel are you seeing this problem with? The above > commit was first added in v3.15-rc1, so maybe try that or any later > version to see if that fixes it. > > Thierry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
