D51589.diff
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	diff --git a/sys/dev/amdgpio/amdgpio.c b/sys/dev/amdgpio/amdgpio.c
	--- a/sys/dev/amdgpio/amdgpio.c
	+++ b/sys/dev/amdgpio/amdgpio.c
	@@ -536,11 +536,59 @@
	return (0);
	}

	+static int
	+amdgpio_suspend(device_t dev)
	+{
	+ struct amdgpio_softc *sc = device_get_softc(dev);
	+ uint32_t reg;
	+ size_t i;
	+ int pin, off;
	+
	+ AMDGPIO_LOCK(sc);
	+
	+ for (i = 0; i < AMD_GPIO_PINS_EXPOSED; i++) {
	+ pin = kernzp_pins[i].pin_num;
	+ off = AMDGPIO_PIN_REGISTER(pin);
	+
	+ reg = amdgpio_read_4(sc, off);
	+ if ((reg & UNSERVICED_INTERRUPT_MASK) != 0)
	+ device_printf(dev, "unserviced interrupt on pin %d!\n",
	+ pin);
	+ /*
	+ * "Service" interrupt and mask. In the future we should only
	+ * mask non-wake interrupts (see WAKE_CNTRL_OFF_S0I3 &c).
	+ *
	+ * (From BKDG) write 1 to interrupt & wake status registers to
	+ * clear them. We can do this by just writing back to them.
	+ */
	+ reg &= ~(1 << INTERRUPT_MASK_OFF);
	+ reg &= ~(1 << INTERRUPT_ENABLE_OFF);
	+ amdgpio_write_4(sc, off, reg);
	+ }
	+
	+ amdgpio_eoi_locked(sc);
	+ AMDGPIO_UNLOCK(sc);
	+
	+ return (0);
	+}
	+
	+static int
	+amdgpio_resume(device_t dev)
	+{
	+ /*
	+ * XXX Will have to resume properly once we're actually able to use
	+ * amdgpio for interrupts.
	+ */
	+ return (0);
	+}
	+
	static device_method_t amdgpio_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe, amdgpio_probe),
	DEVMETHOD(device_attach, amdgpio_attach),
	DEVMETHOD(device_detach, amdgpio_detach),
	+ DEVMETHOD(device_suspend, amdgpio_suspend),
	+ DEVMETHOD(device_resume, amdgpio_resume),

	/* GPIO protocol */
	DEVMETHOD(gpio_get_bus, amdgpio_get_bus),