gpio/omap4: Fix missing interrupts during device wakeup due to IOPAD.

If gpio pins from bank[2-5] are marked as wakeup enable and if the wake is
through gpio IO pad wakeup, then that wakeup gpio interrupt is lost.

In the current implementation, GPIO driver stores the context of DATAIN of
all the gpio in the bank. During GPIO resuming, it checks DATAIN with wakeup
enabled pins of gpio bank. If there is status change, then manually toggle
GPIO_LEVELDETECT to generate pseudo interrupt.

Reported-by: Philippe Mazet <p-mazet@ti.com>
Tested-by: Philippe Mazet <p-mazet@ti.com>
Signed-off-by: Ambresh K <ambresh@ti.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 01f74a8459d99e6b12a7d5bebe5820f17769a62d..35bebde23e835c7674aaaa5e6bbf0e998ab0fd32 100644 (file)
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -469,8 +469,9 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
                                        + OMAP24XX_GPIO_CLEARWKUENA);
                }
        }
-       /* This part needs to be executed always for OMAP34xx */
-       if (cpu_is_omap34xx() || (bank->non_wakeup_gpios & gpio_bit)) {
+       /* This part needs to be executed always for OMAP{34xx, 44xx} */
+       if (cpu_is_omap34xx() || cpu_is_omap44xx() ||
+                       (bank->non_wakeup_gpios & gpio_bit)) {
                /*
                 * Log the edge gpio and manually trigger the IRQ
                 * after resume if the input level changes