pinctrl/nomadik: MASK_ON_SUSPEND

ux500 machines performs pins (GPIO) reconfiguration when entering
in the suspended mode. This reconfiguration aims at reaching an ultra
low power HW configuration.

Due to this HW reconfiguration, some HW devices can change of HW state
and have their output signals at level that could generate IRQs.

If the non-wakeup IRQs are disabled but not yet masked (delayed interrupt
disable feature from the generic irq layer), effective interrupts reach
the system only because the system attempt to enter the suspended mode.

To prevent such IRQs to trig, all irq chips embedded in ux500 platform
should enable their IRQCHIP_MASK_ON_SUSPEND flag.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index 46db2d77ae104469db055a4ed5e71d7f29c50223..0e3d1131113a35d7ea20c552702ff85c09e434f0 100644 (file)
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -819,6 +819,7 @@ static struct irq_chip nmk_gpio_irq_chip = {
        .irq_set_wake   = nmk_gpio_irq_set_wake,
        .irq_startup    = nmk_gpio_irq_startup,
        .irq_shutdown   = nmk_gpio_irq_shutdown,
+       .flags          = IRQCHIP_MASK_ON_SUSPEND,
 };
 
 static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,