pinctrl: rockchip: Enhance support for IRQ_TYPE_EDGE_BOTH

Switching between falling/rising edges for IRQ_TYPE_EDGE_BOTH on pins that
require debounce can cause the device to lose events due to a desync
between pin state and irq type.

This problem is resolved by switching between IRQ_TYPE_LEVEL_LOW and
IRQ_TYPE_LEVEL_HIGH instead.

Fixes: 936ee26 ("gpio/rockchip: add driver for rockchip gpio")
Signed-off-by: João H. Spies <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: JohnnyonFlame

drivers/gpio/gpio-rockchip.c

@@ -419,11 +419,11 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 			goto out;
 		} else {
 			bank->toggle_edge_mode |= mask;
-			level |= mask;
+			level &= ~mask;
 
 			/*
 			 * Determine gpio state. If 1 next interrupt should be
-			 * falling otherwise rising.
+			 * low otherwise high.
 			 */
 			data = readl(bank->reg_base + bank->gpio_regs->ext_port);
 			if (data & mask)