linux-kernel - Re: [PATCH v2 4/7] gpio: brcmstb: switch to handle_level

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Date:   Tue, 31 Oct 2017 10:30:20 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Doug Berger <opendmb@...il.com>
Cc:     Gregory Fong <gregory.0xf0@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 4/7] gpio: brcmstb: switch to handle_level_irq flow

On Tue, Oct 24, 2017 at 9:54 PM, Doug Berger <opendmb@...il.com> wrote:

> Reading and writing the gpio bank status register each time a pending
> interrupt bit is serviced could cause new pending bits to be cleared
> without servicing the associated interrupts.
>
> By using the handle_level_irq flow instead of the handle_simple_irq
> flow we get proper handling of interrupt masking as well as acking
> of interrupts.  The irq_ack method is added to support this.
>
> Fixes: 19a7b6940b78 ("gpio: brcmstb: Add interrupt and wakeup source support")
> Signed-off-by: Doug Berger <opendmb@...il.com>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> Acked-by: Gregory Fong <gregory.0xf0@...il.com>

Patch applied.

Yours,
Linus Walleij