linux-kernel - Re: [PATCH 17/49] regmap-irq: Add broken_mask

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Message-ID: <CAHp75VcN0hf5_AVB-aRBhyvwuojuDC=FbBUqWpUWQR=r=zSRPA@mail.gmail.com>
Date:   Tue, 21 Jun 2022 11:33:35 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
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Subject: Re: [PATCH 17/49] regmap-irq: Add broken_mask_unmask flag

On Mon, Jun 20, 2022 at 10:08 PM Aidan MacDonald
<aidanmacdonald.0x0@...il.com> wrote:
>
> This flag is necessary to prepare for fixing the behavior of unmask
> registers. Existing chips that set mask_base and unmask_base must
> set broken_mask_unmask=1 to declare that they expect the mask bits

Boolean should take true/false.

> will be inverted in both registers, contrary to the usual behavior
> of mask registers.

> diff --git a/include/linux/regmap.h b/include/linux/regmap.h
> index ee2567a0465c..21a70fd99493 100644
> --- a/include/linux/regmap.h
> +++ b/include/linux/regmap.h
> @@ -1523,6 +1523,7 @@ struct regmap_irq_chip {
>         bool clear_on_unmask:1;
>         bool not_fixed_stride:1;
>         bool status_invert:1;
> +       bool broken_mask_unmask:1;

Looking at the given context, I would group it with clean_on_unmask above.

The above is weird enough on its own. Can you prepare a precursor
patch that either drops the bit fields of booleans or moves them to
unsigned int?

Note, bit fields in C are beasts when it goes to concurrent access. It
would be nice to ensure these are not the cases of a such.

-- 
With Best Regards,
Andy Shevchenko