gpio: tegra: Fix tegra_gpio_irq_set_type()

Commit 36b312792b97 ("gpiolib: Respect error code of ->get_direction()")
broke tegra_gpio_irq_set_type() because requesting of GPIO direction must
be done after enabling GPIO function for a pin.

This patch fixes drivers probe failure like this:

 gpio gpiochip0: (tegra-gpio): gpiochip_lock_as_irq: cannot get GPIO direction
 tegra-gpio 6000d000.gpio: unable to lock Tegra GPIO 144 as IRQ

Fixes: 36b312792b97 ("gpiolib: Respect error code of ->get_direction()")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 94396ca..22e7c99 100644 (file)
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -323,13 +323,6 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
                return -EINVAL;
        }
 
-       ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
-       if (ret) {
-               dev_err(tgi->dev,
-                       "unable to lock Tegra GPIO %u as IRQ\n", gpio);
-               return ret;
-       }
-
        spin_lock_irqsave(&bank->lvl_lock[port], flags);
 
        val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
@@ -342,6 +335,14 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
        tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
        tegra_gpio_enable(tgi, gpio);
 
+       ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
+       if (ret) {
+               dev_err(tgi->dev,
+                       "unable to lock Tegra GPIO %u as IRQ\n", gpio);
+               tegra_gpio_disable(tgi, gpio);
+               return ret;
+       }
+
        if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
                irq_set_handler_locked(d, handle_level_irq);
        else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))