diff options
| author | Anand Moon <linux.amoon@gmail.com> | 2015-04-13 04:14:11 +0930 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-04-12 15:59:11 -0700 |
| commit | f354169e0f7dcd1b2c82cf1f98f6d976e85f74c3 (patch) | |
| tree | d92d428a3eb79be2fd1049ff5b5c2966faa73434 /drivers/hwmon | |
| parent | f83a9cb6228472a464c2ab4abb9bd1e83939aec2 (diff) | |
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>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/pwm-fan.c | 9 |
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); |