linux-kernel - [PATCH 5.12 3/7] gpio: mxc: Fix disabled interrupt wake-up support

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Date:   Mon,  5 Jul 2021 06:59:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Michal Koziel <michal.koziel@...ogic.no>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 3/7] gpio: mxc: Fix disabled interrupt wake-up support

From: Loic Poulain <loic.poulain@...aro.org>

[ Upstream commit 3093e6cca3ba7d47848068cb256c489675125181 ]

A disabled/masked interrupt marked as wakeup source must be re-enable
and unmasked in order to be able to wake-up the host. That can be done
by flaging the irqchip with IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND.

Note: It 'sometimes' works without that change, but only thanks to the
lazy generic interrupt disabling (keeping interrupt unmasked).

Reported-by: Michal Koziel <michal.koziel@...ogic.no>
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-mxc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 157106e1e438..b9fdf05d7669 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -334,7 +334,7 @@ static int mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base)
 	ct->chip.irq_unmask = irq_gc_mask_set_bit;
 	ct->chip.irq_set_type = gpio_set_irq_type;
 	ct->chip.irq_set_wake = gpio_set_wake_irq;
-	ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND;
+	ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND;
 	ct->regs.ack = GPIO_ISR;
 	ct->regs.mask = GPIO_IMR;
 
-- 
2.30.2