[PATCH v2] gpio: mxc: Always set GPIOs used as interrupt source to INPUT mode

[Marek Vasut <marex@xxxxxxx>]

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

Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Loic Poulain <loic.poulain@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
---
V2: Actually update and clear bits in GDIR register
---
 drivers/gpio/gpio-mxc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index c871602fc5ba9..ed58441627d92 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -147,7 +147,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct mxc_gpio_port *port = gc->private;
-	u32 bit, val;
+	u32 bit, val, dir;
 	u32 gpio_idx = d->hwirq;
 	int edge;
 	void __iomem *reg = port->base;
@@ -204,6 +204,10 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 
 	writel(1 << gpio_idx, port->base + GPIO_ISR);
 
+	dir = readl(port->base + GPIO_GDIR);
+	dir &= ~BIT(gpio_idx);
+	writel(dir, port->base + GPIO_GDIR);
+
 	return 0;
 }
 
-- 
2.35.1