linux-kernel - Re: [PATCH 6/6] hwmon: pwm-fan: Update the duty cycle inorder to control the pwm-fan

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Date:	Wed, 08 Apr 2015 10:44:15 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Anand Moon <linux.amoon@...il.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 6/6] hwmon: pwm-fan: Update the duty cycle inorder to
 control the pwm-fan

Hi Anand,

> Below changes depend on following patch.
> https://patchwork.kernel.org/patch/5944061/
> 
> Update the pwm_config with duty then update the pwm_disable
> to poweroff the cpu fan.
> 
> Tested on OdroidXU3 board.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>  drivers/hwmon/pwm-fan.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> index 7c83dc4..f25c841 100644
> --- a/drivers/hwmon/pwm-fan.c
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -44,26 +44,24 @@ static int  __set_pwm(struct pwm_fan_ctx *ctx,
> unsigned long pwm) int ret = 0;
>  
>  	mutex_lock(&ctx->lock);
> +
>  	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);

Reviewed-by: Lukasz Majewski <l.majewski@...sung.com>

BTW: I've added Guenter to CC.

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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