linux-kernel - Re: [PATCH v2 2/3] ACPI: PMIC: Replace open coded be16_to

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Date:   Wed, 31 Aug 2022 13:27:53 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Mika Westerberg' <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v2 2/3] ACPI: PMIC: Replace open coded be16_to_cpu()

On Wed, Aug 31, 2022 at 10:06:09AM +0000, David Laight wrote:
> From: Mika Westerberg
> > Sent: 31 August 2022 10:49
> > On Wed, Aug 31, 2022 at 11:37:21AM +0200, Hans de Goede wrote:
> > > On 8/31/22 11:34, Andy Shevchenko wrote:
> > > > On Wed, Aug 31, 2022 at 08:43:54AM +0300, Mika Westerberg wrote:
> > > >> On Tue, Aug 30, 2022 at 08:11:54PM +0300, Andy Shevchenko wrote:
> > > >>> -#define VR_MODE_DISABLED        0
> > > >>> -#define VR_MODE_AUTO            BIT(0)
> > > >>> -#define VR_MODE_NORMAL          BIT(1)
> > > >>> -#define VR_MODE_SWITCH          BIT(2)
> > > >>> -#define VR_MODE_ECO             (BIT(0)|BIT(1))
> > > >>> +#define PMIC_REG_MASK		GENMASK(11, 0)
> > > >>> +
> > > >>> +#define VR_MODE_DISABLED        (0 << 0)
> > > >>> +#define VR_MODE_AUTO            (1 << 0)
> > > >>> +#define VR_MODE_NORMAL          (2 << 0)
> > > >>> +#define VR_MODE_ECO             (3 << 0)
> > > >>> +#define VR_MODE_SWITCH          (4 << 0)
> > > >>
> > > >> IMHO this one is worse than what it was.
> > > >
> > > > I'm not sure why. Here is obvious wrong use of BIT() macro against
> > > > plain numbers. I can split it into a separate change with an explanation
> > > > of why it's better. But I think it doesn't worth the churn.
> > >
> > > FWIW I'm with Andy here, the VR_MODE_ECO clearly is trying
> > > to just say 3, so this is just a plain enum for values 0-4 and
> > > as such should not use the BIT macros.
> > 
> > Yeah, enum would look better but the << 0 just makes me confused ;-)
> 
> No idea what that code is doing.
> The values are all used to initialise a .bit structure member.
> So maybe BIT() is right.
> The _ECO value isn't used at all.
> 
> Deeper analysis may be needed.

So, can you do that since you already started?

-- 
With Best Regards,
Andy Shevchenko