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

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Date:   Fri, 17 Feb 2017 11:23:45 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Phil Reid <preid@...ctromag.com.au>
Cc:     thloh@...era.com, Linus Walleij <linus.walleij@...aro.org>,
        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>
Subject: Re: [PATCH 1/1] gpio: altera: Use handle_level_irq when configured as
 a level_high

On Fri, Feb 17, 2017 at 11:12 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.
> It looks like handle_level_irq should be used in this situation
> instead of handle_simple_irq.

> @@ -310,7 +310,8 @@ static int altera_gpio_probe(struct platform_device *pdev)
>         altera_gc->interrupt_trigger = reg;
>
>         ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0,
> -               handle_simple_irq, IRQ_TYPE_NONE);
> +               altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH ?
> +               handle_level_irq : handle_simple_irq, IRQ_TYPE_NONE);

AFAIK, handle_bad_irq() should be used here.

-- 
With Best Regards,
Andy Shevchenko