Commit 5fcface6 authored by Taiping Lai's avatar Taiping Lai Committed by Bartosz Golaszewski

gpio: sprd: Clear interrupt when setting the type as edge

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.

There're a few considerations for the solution:
1) This issue is for edge interrupt only; The interrupts requested by users
   are IRQ_TYPE_LEVEL_HIGH as default, so clearing interrupt when request
   is useless.
2) The interrupt type can be set to edge when request and following up
   with clearing it though, but the problem is still there once users set
   the interrupt type to level trggier.
3) We can add a clear operation after each time of setting interrupt
   enable bit, but it is redundant for level trigger interrupt.

Therefore, the solution is this patch seems the best for now.

Fixes: 9a3821c2 ("gpio: Add GPIO driver for Spreadtrum SC9860 platform")
Signed-off-by: default avatarTaiping Lai <taiping.lai@unisoc.com>
Signed-off-by: default avatarChunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: default avatarBaolin Wang <baolin.wang7@gmail.com>
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
parent d3f99f91
......@@ -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:
......
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