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ARM: 6101/1: nomadik-gpio: don't enable in set_type 

On this peripheral, setting the trigger type enables the interrupt, and
the current set_type() implementation unconditionally enables the
interrupt, even if it is called when the interrupt is disabled.  Fix
set_type() to:

 - if the interrupt is disabled, defer the actual trigger setting to
   when it is unmasked

 - if the interrupt is enabled, change the type immediately by clearing
   the old type and then re-enabling with the new type.

Acked-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2010-05-06 10:43:55 +01:00 committed by Russell King
parent 040e5ecdda
commit 7a852d8060
1 changed files with 7 additions and 4 deletions
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11
arch/arm/plat-nomadik/gpio.c
View File

@ -162,6 +162,7 @@ static void nmk_gpio_irq_unmask(unsigned int irq)
static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
{
bool enabled = !(irq_to_desc(irq)->status & IRQ_DISABLED);
int gpio;
struct nmk_gpio_chip *nmk_chip;
unsigned long flags;
@ -180,20 +181,22 @@ static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
spin_lock_irqsave(&nmk_chip->lock, flags);
if (enabled)
__nmk_gpio_irq_modify(nmk_chip, gpio, false);
nmk_chip->edge_rising &= ~bitmask;
if (type & IRQ_TYPE_EDGE_RISING)
nmk_chip->edge_rising |= bitmask;
writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);
nmk_chip->edge_falling &= ~bitmask;
if (type & IRQ_TYPE_EDGE_FALLING)
nmk_chip->edge_falling |= bitmask;
writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);
if (enabled)
__nmk_gpio_irq_modify(nmk_chip, gpio, true);
spin_unlock_irqrestore(&nmk_chip->lock, flags);
nmk_gpio_irq_unmask(irq);
return 0;
}