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

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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>
This commit is contained in:
Anand Moon 2015-04-13 04:14:11 +09:30 committed by Guenter Roeck
parent f83a9cb622
commit f354169e0f
1 changed files with 3 additions and 6 deletions
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9
drivers/hwmon/pwm-fan.c
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@ -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);