linux-kernel - Re: [PATCH v4 3/5] platform/x86: acer-wmi: Improve error handling when reading gaming system information

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Message-ID: <i4jcyhqxfugfykbtvrwba4udln4l2cgk7zgj3sy7iqncf47a4q@exk6jk7rmmvk>
Date: Mon, 9 Dec 2024 23:06:49 -0300
From: Kurt Borja <kuurtb@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: jlee@...e.com, farhan.anwar8@...il.com, rayanmargham4@...il.com, 
	hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com, 
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/5] platform/x86: acer-wmi: Improve error handling
 when reading gaming system information

On Tue, Dec 10, 2024 at 01:16:55AM +0100, Armin Wolf wrote:
> If a call to ACER_WMID_GET_GAMING_SYS_INFO_METHODID fails, the lower
> 8 bits will be non-zero. Introduce a helper function to check this and
> use it when reading gaming system information.
> 
> Tested-by: Rayan Margham <rayanmargham4@...il.com>
> Signed-off-by: Armin Wolf <W_Armin@....de>
> ---
>  drivers/platform/x86/acer-wmi.c | 55 +++++++++++++++++++++------------
>  1 file changed, 36 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> index dd57787466b9..ac4500f33b8c 100644
> --- a/drivers/platform/x86/acer-wmi.c
> +++ b/drivers/platform/x86/acer-wmi.c
> @@ -70,6 +70,7 @@ MODULE_LICENSE("GPL");
> 
>  #define ACER_PREDATOR_V4_THERMAL_PROFILE_EC_OFFSET 0x54
> 
> +#define ACER_PREDATOR_V4_RETURN_STATUS_BIT_MASK GENMASK_ULL(7, 0)
>  #define ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK GENMASK(20, 8)
> 
>  /*
> @@ -1513,6 +1514,24 @@ static acpi_status WMID_gaming_get_u64(u64 *value, u32 cap)
>  	return status;
>  }
> 
> +static int WMID_gaming_get_sys_info(u32 command, u64 *out)
> +{
> +	acpi_status status;
> +	u64 result;
> +
> +	status = WMI_gaming_execute_u64(ACER_WMID_GET_GAMING_SYS_INFO_METHODID, command, &result);
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	/* The return status must be zero for the operation to have succeeded */
> +	if (FIELD_GET(ACER_PREDATOR_V4_RETURN_STATUS_BIT_MASK, result))
> +		return -EIO;
> +
> +	*out = result;
> +
> +	return 0;
> +}
> +
>  static void WMID_gaming_set_fan_mode(u8 fan_mode)
>  {
>  	/* fan_mode = 1 is used for auto, fan_mode = 2 used for turbo*/
> @@ -1762,22 +1781,23 @@ static int acer_gsensor_event(void)
> 
>  static int acer_get_fan_speed(int fan)
>  {
> -	if (quirks->predator_v4) {
> -		acpi_status status;
> -		u64 fanspeed;
> +	u64 fanspeed;
> +	u32 command;
> +	int ret;
> 
> -		status = WMI_gaming_execute_u64(
> -			ACER_WMID_GET_GAMING_SYS_INFO_METHODID,
> -			fan == 0 ? ACER_WMID_CMD_GET_PREDATOR_V4_CPU_FAN_SPEED :
> -				   ACER_WMID_CMD_GET_PREDATOR_V4_GPU_FAN_SPEED,
> -			&fanspeed);
> +	if (!quirks->predator_v4)
> +		return -EOPNOTSUPP;
> 
> -		if (ACPI_FAILURE(status))
> -			return -EIO;
> +	if (fan == 0)
> +		command = ACER_WMID_CMD_GET_PREDATOR_V4_CPU_FAN_SPEED;
> +	else
> +		command = ACER_WMID_CMD_GET_PREDATOR_V4_GPU_FAN_SPEED;
> 
> -		return FIELD_GET(ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK, fanspeed);
> -	}
> -	return -EOPNOTSUPP;
> +	ret = WMID_gaming_get_sys_info(command, &fanspeed);
> +	if (ret < 0)
> +		return ret;
> +
> +	return FIELD_GET(ACER_PREDATOR_V4_FAN_SPEED_READ_BIT_MASK, fanspeed);
>  }

I wonder if it's necessary to refactor this function if you are going to
drop it on Patch 4.

> 
>  /*
> @@ -1942,12 +1962,9 @@ static int acer_thermal_profile_change(void)
>  			return err;
> 
>  		/* Check power source */
> -		status = WMI_gaming_execute_u64(
> -			ACER_WMID_GET_GAMING_SYS_INFO_METHODID,
> -			ACER_WMID_CMD_GET_PREDATOR_V4_BAT_STATUS, &on_AC);
> -
> -		if (ACPI_FAILURE(status))
> -			return -EIO;
> +		err = WMID_gaming_get_sys_info(ACER_WMID_CMD_GET_PREDATOR_V4_BAT_STATUS, &on_AC);
> +		if (err < 0)
> +			return err;
> 
>  		switch (current_tp) {
>  		case ACER_PREDATOR_V4_THERMAL_PROFILE_TURBO:
> --
> 2.39.5
>