linux-kernel - [PATCH v1 1/2] gpio: tegra: Fix wake interrupt

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Date:   Tue, 12 Jan 2021 16:30:09 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-tegra@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] gpio: tegra: Fix wake interrupt

The GPIO bank wake interrupt setting was erroneously removed after
conversion to gpio_irq_chip, thus the wake interrupt programming is
broken now. Secondly, the wake_enb of the GPIO driver should be changed
only after the successful toggling of the IRQ wake-state. Restore the wake
interrupt setting and the programming order.

Fixes: efcdca286eef ("gpio: tegra: Convert to gpio_irq_chip")
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpio/gpio-tegra.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index b8a4fd07c559..6c79e9d2f932 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -541,6 +541,7 @@ static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
 	struct tegra_gpio_bank *bank;
 	unsigned int gpio = d->hwirq;
 	u32 port, bit, mask;
+	int err;
 
 	bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
 
@@ -548,14 +549,23 @@ static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
 	bit = GPIO_BIT(gpio);
 	mask = BIT(bit);
 
+	err = irq_set_irq_wake(tgi->irqs[bank->bank], enable);
+	if (err)
+		return err;
+
+	if (d->parent_data) {
+		err = irq_chip_set_wake_parent(d, enable);
+		if (err) {
+			irq_set_irq_wake(tgi->irqs[bank->bank], !enable);
+			return err;
+		}
+	}
+
 	if (enable)
 		bank->wake_enb[port] |= mask;
 	else
 		bank->wake_enb[port] &= ~mask;
 
-	if (d->parent_data)
-		return irq_chip_set_wake_parent(d, enable);
-
 	return 0;
 }
 #endif
-- 
2.29.2