On 04/12/2015 07:54 AM, Anand Moon wrote:
In order to disable the PWM we need to update using following sequence. pwm_config(pwm, 0, period); pwm_disable(pwm); pwm_config() with a zero duty cycle to make it clear the timer and update the PWM registers. pwm_disable will clear the TCON_AUTORELOAD(tcon_chan) and update the PWM register.
There is no TCON_AUTORELOAD in this driver. Future developers will have no idea what you are talking about here. Please provide a generic comment.
Next change in state will get trigger unless a new PWM cycle happened.
That sentence is difficult to parse. Actually, I have no idea what it is supposed to mean.
pwm_config(pwm, duty, period); pwm_enable(pwm); Through pwm_config we update the duty cycle and period and update the PWM register. pwm_enable will update the state to TCON_MANUALUPDATE(tcon_chan) and TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan) and update the PWM register.
This sentence does not make sense in the context of the pwm-fan driver.
Reported-by: Markus Reichl <m.reichl@xxxxxxxxxxxxx> Tested-by: Markus Reichl <m.reichl@xxxxxxxxxxxxx> Reviewed-by: Lukasz Majewski <l.majewski@xxxxxxxxxxx> Reviewed-by: Sjoerd Simons <sjoerd.simons@xxxxxxxxxxxxxxx> Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx> --- drivers/hwmon/pwm-fan.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 7c83dc4..f25c841 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -44,26 +44,24 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) int ret = 0; mutex_lock(&ctx->lock); +
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