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 06:11:33 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lukasz Majewski <l.majewski@...sung.com>,
	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
Subject: Re: [PATCH 6/6] hwmon: pwm-fan: Update the duty cycle inorder to
 control the pwm-fan

On 04/08/2015 01:44 AM, Lukasz Majewski wrote:
> 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.
>
I don't have a copy of the original patch, so I can't apply it.

Guenter

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