[PATCH v2] irqchip/meson-gpio: Allow the GPIO interrupts to wake the system

[Igor Velkov via B4 Relay]

From: Igor Velkov <iav at iav.lv>

meson_gpio_irq_chip has neither .irq_set_wake nor IRQCHIP_SKIP_SET_WAKE,
so enable_irq_wake() fails with -ENXIO for every interrupt routed through
it, and such an interrupt never gets IRQD_WAKEUP_STATE.

That matters for suspend-to-idle. suspend_device_irqs() keeps only the
wakeup interrupts enabled; the rest are suspended and masked by the flow
handler when they first fire. A GPIO interrupt that fires during s2idle
therefore brings a CPU out of idle once, gets masked, and the system
sleeps on. For mem the firmware chooses the wakeup sources, and this
flag changes nothing there.

Set IRQCHIP_SKIP_SET_WAKE, like the other hierarchical irqchips with a
GIC parent. The GIC sets the same flag, so irq_chip_set_wake_parent()
would end there anyway.

Tested on ODROID-HC4 with the PCF8563 alarm interrupt routed through this
controller: with the flag the alarm wakes the board from s2idle 4/4, and
/sys/power/pm_wakeup_irq names it; without the flag the board stayed in
s2idle past the alarm until a power cycle (0/5).

Assisted-by: LLM
Signed-off-by: Igor Velkov <iav at iav.lv>
---
Changes in v2:
- Reworded, as Neil asked: say that the test and the effect are for
  suspend-to-idle, describe how genirq handles the interrupt there, and
  note that for mem the firmware picks the wakeup sources.
- Repeated the run without the flag: 0/5 (v1 said 0/1).
- Link to v1: https://lore.kernel.org/r/20261008-meson-gpio-wake-v1-1-b0af1598d469@iav.lv
---
 drivers/irqchip/irq-meson-gpio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-meson-gpio.c b/drivers/irqchip/irq-meson-gpio.c
index 91a9c337fe6d..e0329ef5e4a2 100644
--- a/drivers/irqchip/irq-meson-gpio.c
+++ b/drivers/irqchip/irq-meson-gpio.c
@@ -538,7 +538,7 @@ static struct irq_chip meson_gpio_irq_chip = {
 #ifdef CONFIG_SMP
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 #endif
-	.flags			= IRQCHIP_SET_TYPE_MASKED,
+	.flags			= IRQCHIP_SET_TYPE_MASKED | IRQCHIP_SKIP_SET_WAKE,
 };
 
 static int meson_gpio_irq_domain_translate(struct irq_domain *domain,

---
base-commit: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a
change-id: 20261008-meson-gpio-wake-f3bfa3bb2e5a

Best regards,
-- 
Igor Velkov <iav at iav.lv>