[PATCH v6 2/2] gpio: mxc: Always set GPIOs used as interrupt source to INPUT mode

[Marek Vasut <marex@denx.de>]

Always configure GPIO pins which are used as interrupt source as INPUTs.
In case the default pin configuration is OUTPUT, or the prior stage does
configure the pins as OUTPUT, then Linux will not reconfigure the pin as
INPUT and no interrupts are received.

Always configure the interrupt source GPIO pin as input to fix the above case.

Fixes: 07bd1a6cc7cbb ("MXC arch: Add gpio support for the whole platform")
Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Loic Poulain <loic.poulain@linaro.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
---
V2: Actually update and clear bits in GDIR register
V3: Rebase on top of new patch 1/2, expand CC list, add Fixes tag
V4: No change
V5: No change
V6: - Call gc->direction_input() to set direction, instead of GDIR register
      poking. The bgpio (gpio-mmio) may cache the content of direction
      register, so updating the HW GDIR register is not enough. Calling
      the gc->direction() assures the cache is updated.
    - Drop RBs since this is updated patch.
---
 drivers/gpio/gpio-mxc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 6cc98a5684ae1..dd91908c72f19 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -210,7 +210,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 
 	raw_spin_unlock_irqrestore(&port->gc.bgpio_lock, flags);
 
-	return 0;
+	return port->gc.direction_input(&port->gc, gpio_idx);
 }
 
 static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
-- 
2.35.1