linux-kernel - Re: [PATCH v6 02/12] platform/x86: alienware-wmi-wmax: Refactor is_awcc_thermal

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Message-ID: <be5a2029-a00f-7ed1-fb90-af1122b6f127@linux.intel.com>
Date: Fri, 28 Mar 2025 16:17:17 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Kurt Borja <kuurtb@...il.com>
cc: Armin Wolf <W_Armin@....de>, Hans de Goede <hdegoede@...hat.com>, 
    platform-driver-x86@...r.kernel.org, Dell.Client.Kernel@...l.com, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 02/12] platform/x86: alienware-wmi-wmax: Refactor
 is_awcc_thermal_mode()

On Thu, 13 Mar 2025, Kurt Borja wrote:

> Refactor is_awcc_thermal_mode() to use FIELD_GET() instead of bitwise
> operations. Drop the check for BIT(8) sensor flag and rename it to
> is_awcc_thermal_profile_id().
> 
> Reviewed-by: Armin Wolf <W_Armin@....de>
> Signed-off-by: Kurt Borja <kuurtb@...il.com>
> ---
>  drivers/platform/x86/dell/alienware-wmi-wmax.c | 33 +++++++++++++-------------
>  1 file changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> index ed70e12d73d7fe5d89f3364c5367820bf47e3c1e..80aefba5b22d6b4ac18aeb2ca356f8c911150abd 100644
> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> @@ -34,7 +34,8 @@
>  #define AWCC_FAILURE_CODE			0xFFFFFFFF
>  #define AWCC_THERMAL_TABLE_MASK			GENMASK(7, 4)
>  #define AWCC_THERMAL_MODE_MASK			GENMASK(3, 0)
> -#define AWCC_SENSOR_ID_MASK			BIT(8)

I'd prefer leaving this in place even if it now becomes unused, or 
actually I suggest you move it before the GENMASKs to keep the values in 
order, and leave an empty row between failure code and these id related 
masks.

> +/* Some IDs have a BIT(8) flag that we ignore */
> +#define AWCC_RESOURCE_ID_MASK			GENMASK(7, 0)

(AWCC_THERMAL_TABLE_MASK | AWCC_THERMAL_MODE_MASK) ?
  
>  static bool force_platform_profile;
>  module_param_unsafe(force_platform_profile, bool, 0);
> @@ -168,8 +169,8 @@ enum AWCC_GAME_SHIFT_STATUS_OPERATIONS {
>  };
>  
>  enum AWCC_THERMAL_TABLES {
> -	AWCC_THERMAL_TABLE_LEGACY		= 0x90,
> -	AWCC_THERMAL_TABLE_USTT			= 0xA0,
> +	AWCC_THERMAL_TABLE_LEGACY		= 0x9,
> +	AWCC_THERMAL_TABLE_USTT			= 0xA,
>  };
>  
>  enum awcc_thermal_profile {
> @@ -445,20 +446,18 @@ const struct attribute_group wmax_deepsleep_attribute_group = {
>   * Thermal Profile control
>   *  - Provides thermal profile control through the Platform Profile API
>   */
> -static bool is_awcc_thermal_mode(u32 code)
> +static bool is_awcc_thermal_profile_id(u8 code)
>  {
> -	if (code & AWCC_SENSOR_ID_MASK)
> +	u8 table = FIELD_GET(AWCC_THERMAL_TABLE_MASK, code);
> +	u8 mode = FIELD_GET(AWCC_THERMAL_MODE_MASK, code);
> +
> +	if (mode >= AWCC_PROFILE_LAST)
>  		return false;
>  
> -	if ((code & AWCC_THERMAL_MODE_MASK) >= AWCC_PROFILE_LAST)
> -		return false;
> -
> -	if ((code & AWCC_THERMAL_TABLE_MASK) == AWCC_THERMAL_TABLE_LEGACY &&
> -	    (code & AWCC_THERMAL_MODE_MASK) >= AWCC_PROFILE_LEGACY_QUIET)
> +	if (table == AWCC_THERMAL_TABLE_LEGACY && mode >= AWCC_PROFILE_LEGACY_QUIET)
>  		return true;
>  
> -	if ((code & AWCC_THERMAL_TABLE_MASK) == AWCC_THERMAL_TABLE_USTT &&
> -	    (code & AWCC_THERMAL_MODE_MASK) <= AWCC_PROFILE_USTT_LOW_POWER)
> +	if (table == AWCC_THERMAL_TABLE_USTT && mode <= AWCC_PROFILE_USTT_LOW_POWER)
>  		return true;
>  
>  	return false;
> @@ -548,7 +547,7 @@ static int awcc_platform_profile_get(struct device *dev,
>  		return 0;
>  	}
>  
> -	if (!is_awcc_thermal_mode(out_data))
> +	if (!is_awcc_thermal_profile_id(out_data))
>  		return -ENODATA;
>  
>  	out_data &= AWCC_THERMAL_MODE_MASK;
> @@ -597,6 +596,7 @@ static int awcc_platform_profile_probe(void *drvdata, unsigned long *choices)
>  	u32 first_mode;
>  	u32 out_data;
>  	int ret;
> +	u8 id;
>  
>  	ret = awcc_thermal_information(priv->wdev, AWCC_OP_GET_SYSTEM_DESCRIPTION,
>  				       0, (u32 *) &sys_desc);
> @@ -615,12 +615,13 @@ static int awcc_platform_profile_probe(void *drvdata, unsigned long *choices)
>  		if (ret == -EBADRQC)
>  			break;
>  
> -		if (!is_awcc_thermal_mode(out_data))
> +		id = FIELD_GET(AWCC_RESOURCE_ID_MASK, out_data);
> +		if (!is_awcc_thermal_profile_id(id))
>  			continue;
>  
> -		mode = out_data & AWCC_THERMAL_MODE_MASK;
> +		mode = FIELD_GET(AWCC_THERMAL_MODE_MASK, id);
>  		profile = awcc_mode_to_platform_profile[mode];
> -		priv->supported_thermal_profiles[profile] = out_data;
> +		priv->supported_thermal_profiles[profile] = id;
>  
>  		set_bit(profile, choices);
>  	}

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.