提交 732063b9 编写于 作者: T Thomas Gleixner 提交者: Grant Likely

gpio/langwell: Simplify demux loop

Use __ffs() to find the pending interrupt source instead of looping 32
times.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Alek Du <alek.du@intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
上级 674db906
......@@ -191,19 +191,20 @@ static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data);
struct irq_chip *chip = irq_data_get_irq_chip(data);
u32 base, gpio, gedr_v;
unsigned long pending;
void __iomem *gedr;
/* check GPIO controller to check which pin triggered the interrupt */
for (base = 0; base < lnw->chip.ngpio; base += 32) {
gedr = gpio_reg(&lnw->chip, base, GEDR);
gedr_v = readl(gedr);
gedr_v = pending = readl(gedr);
if (!gedr_v)
continue;
for (gpio = base; gpio < base + 32; gpio++)
if (gedr_v & BIT(gpio % 32)) {
pr_debug("pin %d triggered\n", gpio);
generic_handle_irq(lnw->irq_base + gpio);
}
while (pending) {
gpio = __ffs(pending) - 1;
pending &= ~BIT(gpio);
generic_handle_irq(lnw->irq_base + base + gpio);
}
/* clear the edge detect status bit */
writel(gedr_v, gedr);
}
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册