linux-kernel - Re: [PATCH v2 2/2] pinctrl: rockchip: Fix enable/disable/mask/unmask

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Date:	Fri, 28 Nov 2014 09:06:59 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Sonny Rao <sonnyrao@...omium.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Chris Zhong <zyw@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] pinctrl: rockchip: Fix enable/disable/mask/unmask

On Wed, Nov 19, 2014 at 11:51 PM, Doug Anderson <dianders@...omium.org> wrote:

> The Rockchip pinctrl driver was only implementing the "mask" and
> "unmask" operations though the hardware actually has two distinct
> things: enable/disable and mask/unmask.  It was implementing the
> "mask" operations as a hardware enable/disable and always leaving all
> interrupts unmasked.
>
> I believe that the old system had some downsides, specifically:
> - (Untested) if an interrupt went off while interrupts were "masked"
>   it would be lost.  Now it will be kept track of.
> - If someone wanted to change an interrupt back into a GPIO (is such a
>   thing sensible?) by calling irq_disable() it wouldn't actually take
>   effect.  That's because Linux does some extra optimizations when
>   there's no true "disable" function: it does a lazy mask.
>
> Let's actually implement enable/disable/mask/unmask properly.
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> ---
> Changes in v2:
> - Spread out code (heiko)

Patch applied.

Yours,
Linus Walleij
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