linux-kernel - Re: [PATCH v3 2/2] hwmon: (nct6775) Fix fan speed set failure in automatic mode

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Date:   Tue, 21 Nov 2023 07:59:53 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Xing Tong Wu <xingtong_wu@....com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, xingtong.wu@...mens.com,
        tobias.schaffner@...mens.com, gerd.haeussler.ext@...mens.com
Subject: Re: [PATCH v3 2/2] hwmon: (nct6775) Fix fan speed set failure in
 automatic mode

On Tue, Nov 21, 2023 at 04:16:04PM +0800, Xing Tong Wu wrote:
> From: Xing Tong Wu <xingtong.wu@...mens.com>
> 
> Setting the fan speed is only valid in manual mode; it is not possible
> to set the fan's speed in automatic mode.
> Return error when attempting to set the fan speed in automatic mode.
> 
> Signed-off-by: Xing Tong Wu <xingtong.wu@...mens.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/nct6775-core.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
> index 88300fb99bb9..83f1da5acd22 100644
> --- a/drivers/hwmon/nct6775-core.c
> +++ b/drivers/hwmon/nct6775-core.c
> @@ -2553,6 +2553,13 @@ store_pwm(struct device *dev, struct device_attribute *attr, const char *buf,
>  	int err;
>  	u16 reg;
>  
> +	/*
> +	 * The fan control mode should be set to manual if the user wants to adjust
> +	 * the fan speed. Otherwise, it will fail to set.
> +	 */
> +	if (index == 0 && data->pwm_enable[nr] > manual)
> +		return -EBUSY;
> +
>  	err = kstrtoul(buf, 10, &val);
>  	if (err < 0)
>  		return err;