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>

diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index a8ac545..b877d76 100644 (file)
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -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;
@@ -180,19 +181,21 @@ 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);
 
-       spin_unlock_irqrestore(&nmk_chip->lock, flags);
+       if (enabled)
+               __nmk_gpio_irq_modify(nmk_chip, gpio, true);
 
-       nmk_gpio_irq_unmask(irq);
+       spin_unlock_irqrestore(&nmk_chip->lock, flags);
 
        return 0;
 }