From: Stephen Warren <swarren@xxxxxxxxxx>
Whenever an IRQ is claimed or freed, call gpio_lock_as_irq() or
gpio_unlock_as_irq() on the associated GPIO, to prevent that GPIO from
being configured in a manner incompatible with an interrupt.
Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
---
drivers/gpio/gpio-tegra.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 9a62672..cfd3b90 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -75,6 +75,7 @@ struct tegra_gpio_bank {
#endif
};
+static struct device *dev;
static struct irq_domain *irq_domain;
static void __iomem *regs;
static u32 tegra_gpio_bank_count;
@@ -205,6 +206,7 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
int lvl_type;
int val;
unsigned long flags;
+ int ret;
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
@@ -231,6 +233,12 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
return -EINVAL;
}
+ ret = gpio_lock_as_irq(&tegra_gpio_chip, gpio);
+ if (ret) {
+ dev_err(dev, "unable to lock Tegra GPIO %d as IRQ\n", gpio);
+ return ret;
+ }
+
spin_lock_irqsave(&bank->lvl_lock[port], flags);
val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
@@ -251,6 +259,13 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
return 0;
}
+static void tegra_gpio_irq_shutdown(struct irq_data *d)
+{
+ int gpio = d->hwirq;
+
+ gpio_unlock_as_irq(&tegra_gpio_chip, gpio);
+}
+
static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct tegra_gpio_bank *bank;
@@ -368,6 +383,7 @@ static struct irq_chip tegra_gpio_irq_chip = {
.irq_mask = tegra_gpio_irq_mask,
.irq_unmask = tegra_gpio_irq_unmask,
.irq_set_type = tegra_gpio_irq_set_type,
+ .irq_shutdown = tegra_gpio_irq_shutdown,
#ifdef CONFIG_PM_SLEEP
.irq_set_wake = tegra_gpio_irq_set_wake,
#endif
@@ -413,6 +429,8 @@ static int tegra_gpio_probe(struct platform_device *pdev)
int i;
int j;
+ dev = &pdev->dev;
+
match = of_match_device(tegra_gpio_of_match, &pdev->dev);
if (!match) {
dev_err(&pdev->dev, "Error: No device match found\n");
--
1.8.1.5
--
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