linux-kernel - Re: [PATCH] gpio: vf610: handle level IRQ's properly

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Message-ID: <CACRpkdYmaOQ-N4yGXo3_95dTVhF6FC0C9O2w+811=xLTO7gm0g@mail.gmail.com>
Date:	Thu, 24 Sep 2015 16:03:28 -0700
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stefan Agner <stefan@...er.ch>, Tien Hock Loh <thloh@...era.com>,
	Markus Mayer <markus.mayer@...aro.org>,
	Markus Mayer <mmayer@...adcom.com>,
	Andreas Larsson <andreas@...sler.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>,
	Ulrich Hecht <ulrich.hecht+renesas@...il.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Richard Röjfors <richard.rojfors@...il.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: vf610: handle level IRQ's properly

On Wed, Aug 26, 2015 at 10:11 AM, Stefan Agner <stefan@...er.ch> wrote:
> On 2015-08-26 05:47, Linus Walleij wrote:
>> On Sat, Aug 22, 2015 at 12:56 AM, Stefan Agner <stefan@...er.ch> wrote:
>>
>>> The GPIO IRQ controller is able to generate level triggered
>>> interrupts, however, these were handled by handle_simple_irq so far
>>> which did not take care of IRQ masking. This lead to "nobody cared
>>> (try booting with the "irqpoll" option)" stack traces.
>>>
>>> Use the generic interrupt handlers depending on the IRQ type.
>>>
>>> Signed-off-by: Stefan Agner <stefan@...er.ch>
>>
>> Patch applied.
>
> Thx
>
>
>> Hm, this looks like a problem that could exist in a few more
>> GPIO drivers. Can you look around and see if there is something
>> immediately suspicious in drivers/gpio?
>
> Just looked a bit around. There are some which use handle_simple_irq but
> also run their handler in threaded/one-shot handler. I guess in that
> case it is fine to use the simple_irq handler.
>
> However, those GPIO drivers look suspicious:
>
> gpio-altera.c: Uses handle_simple_irq, supports edge and level
> gpio-bcm-kona.c: Uses handle_simple_irq, supports only edge
> gpio-grgpio.c: Uses handle_simple_irq, supports edge and level
> gpio-intel-mid.c: Uses handle_simple_irq, supports only edge
> gpio-lynxpoint.c: Uses handle_simple_irq, supports edge and level
> gpio-ml-ioh.c: Uses handle_simple_irq, supports edge and level
> gpio-pl061.c: Uses handle_simple_irq, supports edge and level
> gpio-rcar.c: Uses handle_level_irq, supports edge and level
> gpio-timberdale.c: Uses handle_simple_irq, supports edge and level

Thanks!

I'm gonna look at pl061 myself, for the rest I ping the maintainers,
(To-line) I suspect a lot of them have never really been tested with
level IRQs because most just use edge IRQs.

Yours,
Linus Walleij
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