OMAP2/3: GPIO: do not attempt to wake-enable

The GPIO IRQ enable/disable path attempts to also enable IRQ wake
support for the parent GPIO bank IRQ as well.  However, since there is
no 'set_wake' hook for the bank IRQs, these calls will always fail.
Also, since the enable will fail on the suspend path, the disable on
the resume path will trigger unbalanced enable/disable warnings.

This was discovered in the suspend/resume path on OMAP3/Beagle using
the gpio-keys driver which disables/re-enables GPIO IRQ wakeups in the
suspend/resume path.
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/gpio.c

@@ -837,13 +837,10 @@ static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 	case METHOD_MPUIO:
 	case METHOD_GPIO_1610:
 		spin_lock_irqsave(&bank->lock, flags);
-		if (enable) {
+		if (enable)
 			bank->suspend_wakeup |= (1 << gpio);
-			enable_irq_wake(bank->irq);
-		} else {
-			disable_irq_wake(bank->irq);
+		else
 			bank->suspend_wakeup &= ~(1 << gpio);
-		}
 		spin_unlock_irqrestore(&bank->lock, flags);
 		return 0;
 #endif
@@ -856,13 +853,10 @@ static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 			return -EINVAL;
 		}
 		spin_lock_irqsave(&bank->lock, flags);
-		if (enable) {
+		if (enable)
 			bank->suspend_wakeup |= (1 << gpio);
-			enable_irq_wake(bank->irq);
-		} else {
-			disable_irq_wake(bank->irq);
+		else
 			bank->suspend_wakeup &= ~(1 << gpio);
-		}
 		spin_unlock_irqrestore(&bank->lock, flags);
 		return 0;
 #endif