hwmon: (pwm-fan) Update the duty cycle inorder to control the pwm-fan

pwm_config() must be called with a duty cycle of 0 prior to calling
pwm_disable() to ensure that the pwm signal is set to low.

Reported-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Reviewed-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 31d793b..2d9a712 100644 (file)
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -47,23 +47,20 @@ static int  __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
        if (ctx->pwm_value == pwm)
                goto exit_set_pwm_err;
 
-       if (pwm == 0) {
-               pwm_disable(ctx->pwm);
-               goto exit_set_pwm;
-       }
-
        duty = DIV_ROUND_UP(pwm * (ctx->pwm->period - 1), MAX_PWM);
        ret = pwm_config(ctx->pwm, duty, ctx->pwm->period);
        if (ret)
                goto exit_set_pwm_err;
 
+       if (pwm == 0)
+               pwm_disable(ctx->pwm);
+
        if (ctx->pwm_value == 0) {
                ret = pwm_enable(ctx->pwm);
                if (ret)
                        goto exit_set_pwm_err;
        }
 
-exit_set_pwm:
        ctx->pwm_value = pwm;
 exit_set_pwm_err:
        mutex_unlock(&ctx->lock);