linux-kernel - Re: [PATCH] pinctrl: rockchip: Enhance support for IRQ_TYPE_EDGE

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Date:   Tue, 23 Aug 2022 12:00:34 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     João H. Spies <jhlspies@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Jianqun Xu <jay.xu@...k-chips.com>,
        Maya Matuszczyk <maccraft123mc@...il.com>,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: rockchip: Enhance support for IRQ_TYPE_EDGE_BOTH

Am Montag, 22. August 2022, 11:03:08 CEST schrieb Linus Walleij:
> On Mon, Aug 8, 2022 at 4:53 AM João H. Spies <jhlspies@...il.com> wrote:
> 
> > Switching between falling/rising edges for IRQ_TYPE_EDGE_BOTH on pins that
> > require debounce can cause the device to lose events due to a desync
> > between pin state and irq type.
> >
> > This problem is resolved by switching between IRQ_TYPE_LEVEL_LOW and
> > IRQ_TYPE_LEVEL_HIGH instead.
> >
> > Fixes: 936ee26 ("gpio/rockchip: add driver for rockchip gpio")
> > Signed-off-by: João H. Spies <jhlspies@...il.com>
> 
> No reaction from maintainers so I'm just gonna assume this fix is
> correct and applied for fixes.

This plays with behavioral peculiarities of the gpio controller
(using the level setting to hopefully prevent missing edge irqs),
so doesn't follow

So I guess it really is more of a wait-and-see. And I guess as João
seems to have experienced that issue, that will hopefully work
for others too.

Heiko