[ARM] 3672/1: PXA: don't probe output GPIOs for interrupt

Patch from Guennadi Liakhovetski

Currently probe_irq_on() on PXA will silently reconfigure all output GPIOs, that are not configured as alternate functions, for input. Avoid that. Upon CPU reset all GPIOs are configured as inputs, so, if a GPIO is configured as output, it has been done so intentionally.
Signed-off-by: NG. Liakhovetski <gl@dsa-ac.de>
Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/irq.c

@@ -88,8 +88,8 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	if (type == IRQT_PROBE) {
 	    /* Don't mess with enabled GPIOs using preconfigured edges or
-	       GPIOs set to alternate function during probe */
-		if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx]) &
+	       GPIOs set to alternate function or to output during probe */
+		if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx] | GPDR(gpio)) &
 		    GPIO_bit(gpio))
 			return 0;
 		if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))