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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Mon, 29 Aug 2022 06:35:56 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     "Luke D. Jones" <luke@ljones.dev>
Cc:     hdegoede@redhat.com, linux-kernel@vger.kernel.org,
        linux-hwmon@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        markgross@kernel.org
Subject: Re: [PATCH] asus-wmi: Increase FAN_CURVE_BUF_LEN to 32
Message-ID: <20220829133556.GA3766826@roeck-us.net>
References: <20220828074638.5473-1-luke@ljones.dev>
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In-Reply-To: <20220828074638.5473-1-luke@ljones.dev>
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On Sun, Aug 28, 2022 at 07:46:38PM +1200, Luke D. Jones wrote:
> Fix for TUF laptops returning with an -ENOSPC on calling
> asus_wmi_evaluate_method_buf() when fetching default curves. The TUF method
> requires at least 32 bytes space.
> 
> This also moves and changes the pr_debug() in fan_curve_check_present() to
> pr_warn() in fan_curve_get_factory_default() so that there is at least some
> indication in logs of why it fails.
> 
> Signed-off-by: Luke D. Jones <luke@ljones.dev>
> ---
>  drivers/platform/x86/asus-wmi.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 3d9fd58573f9..11203213e00d 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -108,7 +108,7 @@ module_param(fnlock_default, bool, 0444);
>  #define WMI_EVENT_MASK			0xFFFF
>  
>  #define FAN_CURVE_POINTS		8
> -#define FAN_CURVE_BUF_LEN		(FAN_CURVE_POINTS * 2)
> +#define FAN_CURVE_BUF_LEN		32
>  #define FAN_CURVE_DEV_CPU		0x00
>  #define FAN_CURVE_DEV_GPU		0x01
>  /* Mask to determine if setting temperature or percentage */
> @@ -2383,8 +2383,10 @@ static int fan_curve_get_factory_default(struct asus_wmi *asus, u32 fan_dev)
>  	curves = &asus->custom_fan_curves[fan_idx];
>  	err = asus_wmi_evaluate_method_buf(asus->dsts_id, fan_dev, mode, buf,
>  					   FAN_CURVE_BUF_LEN);
> -	if (err)
> +	if (err) {
> +		pr_warn("%s (0x%08x) failed: %d\n", __func__, fan_dev, err);
>  		return err;
> +	}
>  
>  	fan_curve_copy_from_buf(curves, buf);
>  	curves->device_id = fan_dev;
> @@ -2402,9 +2404,6 @@ static int fan_curve_check_present(struct asus_wmi *asus, bool *available,
>  
>  	err = fan_curve_get_factory_default(asus, fan_dev);
>  	if (err) {
> -		pr_debug("fan_curve_get_factory_default(0x%08x) failed: %d\n",
> -			 fan_dev, err);
> -		/* Don't cause probe to fail on devices without fan-curves */

The pr_warn() should be here. If you want to have a message from the call
in fan_curve_enable_store(), add dev_err() there.

Guenter

>  		return 0;
>  	}
>