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pinctrl: at91: choose appropriate handler for level interrupts

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The current implementation handle both edge and level interrupts with the
'handle_simple_irq' handler.

Level interrupts are active as long as the pin stays at the configured
level (low or high). In this case we have to use 'handle_level_irq' which
mask the interrupt until the handle has treated it.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Boris BREZILLON 2013-07-20 16:51:33 +02:00 committed by Linus Walleij
parent ef75bfd5d1
commit 99fce0295e
1 changed files with 14 additions and 2 deletions
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16
drivers/pinctrl/pinctrl-at91.c
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@ -1241,18 +1241,22 @@ static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
switch (type) {
case IRQ_TYPE_EDGE_RISING:
irq_set_handler(d->irq, handle_simple_irq);
writel_relaxed(mask, pio + PIO_ESR);
writel_relaxed(mask, pio + PIO_REHLSR);
break;
case IRQ_TYPE_EDGE_FALLING:
irq_set_handler(d->irq, handle_simple_irq);
writel_relaxed(mask, pio + PIO_ESR);
writel_relaxed(mask, pio + PIO_FELLSR);
break;
case IRQ_TYPE_LEVEL_LOW:
irq_set_handler(d->irq, handle_level_irq);
writel_relaxed(mask, pio + PIO_LSR);
writel_relaxed(mask, pio + PIO_FELLSR);
break;
case IRQ_TYPE_LEVEL_HIGH:
irq_set_handler(d->irq, handle_level_irq);
writel_relaxed(mask, pio + PIO_LSR);
writel_relaxed(mask, pio + PIO_REHLSR);
break;
@ -1261,6 +1265,7 @@ static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
* disable additional interrupt modes:
* fall back to default behavior
*/
irq_set_handler(d->irq, handle_simple_irq);
writel_relaxed(mask, pio + PIO_AIMDR);
return 0;
case IRQ_TYPE_NONE:
@ -1402,6 +1407,8 @@ static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct at91_gpio_chip *at91_gpio = h->host_data;
void __iomem *pio = at91_gpio->regbase;
u32 mask = 1 << hw;
irq_set_lockdep_class(virq, &gpio_lock_class);
@ -1409,8 +1416,13 @@ static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
* Can use the "simple" and not "edge" handler since it's
* shorter, and the AIC handles interrupts sanely.
*/
irq_set_chip_and_handler(virq, &gpio_irqchip,
handle_simple_irq);
irq_set_chip(virq, &gpio_irqchip);
if ((at91_gpio->ops == &at91sam9x5_ops) &&
(readl_relaxed(pio + PIO_AIMMR) & mask) &&
(readl_relaxed(pio + PIO_ELSR) & mask))
irq_set_handler(virq, handle_level_irq);
else
irq_set_handler(virq, handle_simple_irq);
set_irq_flags(virq, IRQF_VALID);
irq_set_chip_data(virq, at91_gpio);