linux-kernel - [PATCH] gpio: sprd: Clear interrupt when setting the type as edge

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Date:   Wed, 29 Jul 2020 17:34:50 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Taiping Lai <taiping.lai@...soc.com>
Subject: [PATCH] gpio: sprd: Clear interrupt when setting the type as edge

From: Taiping Lai <taiping.lai@...soc.com>

The raw interrupt status of GPIO maybe set before the interrupt is enabled,
which would trigger the interrupt event once enabled it from user side.
This is the case for edge interrupts only. Adding a clear operation when
setting interrupt type can avoid that.

Fixes: 9a3821c2bb47 ("gpio: Add GPIO driver for Spreadtrum SC9860 platform")
Signed-off-by: Taiping Lai <taiping.lai@...soc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 drivers/gpio/gpio-sprd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-sprd.c b/drivers/gpio/gpio-sprd.c
index d7314d39ab65..36ea8a3bd451 100644
--- a/drivers/gpio/gpio-sprd.c
+++ b/drivers/gpio/gpio-sprd.c
@@ -149,17 +149,20 @@ static int sprd_gpio_irq_set_type(struct irq_data *data,
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1);
+		sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
 		irq_set_handler_locked(data, handle_edge_irq);
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0);
+		sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
 		irq_set_handler_locked(data, handle_edge_irq);
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
 		sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 1);
+		sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
 		irq_set_handler_locked(data, handle_edge_irq);
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
-- 
2.20.1