linux-kernel - Re: [PATCH v2 1/1] gpio: altera: Use handle_level_irq when configured as a level

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Message-ID: <CACRpkdYwqH3tP=VaVr9bv5ttaqfh-PGf1qCJKT+rhwBTKWaz5g@mail.gmail.com>
Date:   Thu, 23 Feb 2017 16:10:16 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Phil Reid <preid@...ctromag.com.au>
Cc:     Tien Hock Loh <thloh@...era.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2 1/1] gpio: altera: Use handle_level_irq when configured
 as a level_high

On Mon, Feb 20, 2017 at 2:41 AM, Phil Reid <preid@...ctromag.com.au> wrote:

> When a threaded irq handler is chained attached to one of the gpio
> pins when configure for level irq the altera_gpio_irq_leveL_high_handler
> does not mask the interrupt while being handled by the chained irq.
> This resulting in the threaded irq not getting enough cycles to complete
> quickly enough before the irq was disabled as faulty. handle_level_irq
> should be used in this situation instead of handle_simple_irq.
>
> In gpiochip_irqchip_add set default handler to handle_bad_irq as
> per Documentation/gpio/driver.txt. Then set the correct handler in
> the set_type callback.
>
> Signed-off-by: Phil Reid <preid@...ctromag.com.au>
> ---
>
> Notes:
>     Change from v1:
>     - As per hint from Andy.
>       Set handler to handle_bad_irq in gpiochip_irqchip_add
>       This is inline with documentation but not what most gpio drivers do.
>       So I'm guessing this is now the correct way to do things.

Heh I caught up on reviews and in the inbox is already this patch
that fixes my review comments before I even sent them...

Thanks and patch applied for fixes.

Yours,
Linus Walleij