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>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 31d793bd7b12..2d9a712699ff 100644
--- 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);