From: "Li, Ning" <[email protected]> Disable falling/rising edge detection during irq shutdown operation.
Signed-off-by: David Cohen <[email protected]> Signed-off-by: Li, Ning <[email protected]> --- drivers/gpio/gpio-langwell.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c index 2be69fe..10cc520 100644 --- a/drivers/gpio/gpio-langwell.c +++ b/drivers/gpio/gpio-langwell.c @@ -225,11 +225,32 @@ static void lnw_irq_mask(struct irq_data *d) { } +static void lnw_irq_shutdown(struct irq_data *d) +{ + struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d); + u32 gpio = irqd_to_hwirq(d); + unsigned long flags; + u32 value; + void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER); + void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER); + + spin_lock_irqsave(&lnw->lock, flags); + + /* Disable falling/rising edge detection */ + value = readl(grer) & ~BIT(gpio % 32); + writel(value, grer); + value = readl(gfer) & ~BIT(gpio % 32); + writel(value, gfer); + + spin_unlock_irqrestore(&lnw->lock, flags); +}; + static struct irq_chip lnw_irqchip = { .name = "LNW-GPIO", .irq_mask = lnw_irq_mask, .irq_unmask = lnw_irq_unmask, .irq_set_type = lnw_irq_type, + .irq_shutdown = lnw_irq_shutdown, }; static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = { /* pin number */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
