linux-kernel - Re: [PATCH v2 1/3] platform/x86/intel/tpmi: Add defines to get version information

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Date:   Wed, 4 Oct 2023 15:59:57 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     hdegoede@...hat.com, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] platform/x86/intel/tpmi: Add defines to get
 version information

On Tue, Oct 03, 2023 at 11:49:14AM -0700, Srinivas Pandruvada wrote:
> Add defines to get major and minor version from a TPMI version field
> value. This will avoid code duplication to convert in every feature
> driver. Also add define for invalid version field.

...

> +#define TPMI_VERSION_INVALID	0xff

I would make it clearer with (GENMASK(7, 5) | GENMASK(4, 0))
or even with specific masks defined and used in both cases:
#def

#define TPMI_MINVER_MASK	GENMASK(4, 0)
#define TPMI_MAJVER_MASK	GENMASK(7, 5)

#define TPMI_VERSION_INVALID	(TPMI_MINVER_MASK | TPMI_MAJVER_MASK)

#define TPMI_MINOR_VERSION(val)	FIELD_GET(TPMI_MINVER_MASK, val)
#define TPMI_MAJOR_VERSION(val)	FIELD_GET(TPMI_MAJVER_MASK, val)

> +#define TPMI_MINOR_VERSION(val)	FIELD_GET(GENMASK(4, 0), val)
> +#define TPMI_MAJOR_VERSION(val)	FIELD_GET(GENMASK(7, 5), val)

-- 
With Best Regards,
Andy Shevchenko