[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: G. Liakhovetski <gl@dsa-ac.de>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 539b596..d9635ff 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -88,8 +88,8 @@
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)))