Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 48b9d5b4 authored by Kamil Debski's avatar Kamil Debski Committed by Guenter Roeck
Browse files

hwmon: (pwm-fan) Fix suspend/resume behavior 



The state of a PWM output is not clearly defined after resume. Some PWM
drivers do not restore the duty cycle upon resume, thus it is necessary to
manually restore the correct value.

Signed-off-by: default avatarKamil Debski <k.debski@samsung.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent aab18da4

drivers/hwmon/pwm-fan.c

+10 −3
Original line number Diff line number Diff line
@@ -161,10 +161,17 @@ static int pwm_fan_suspend(struct device *dev) 
static int pwm_fan_resume(struct device *dev)

{

	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);

	unsigned long duty;

	int ret;



	if (ctx->pwm_value)

		return pwm_enable(ctx->pwm);

	if (ctx->pwm_value == 0)

		return 0;



	duty = DIV_ROUND_UP(ctx->pwm_value * (ctx->pwm->period - 1), MAX_PWM);

	ret = pwm_config(ctx->pwm, duty, ctx->pwm->period);

	if (ret)

		return ret;

	return pwm_enable(ctx->pwm);

}

#endif