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gpio: gpiolib: Allow GPIO IRQs to lazy disable

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With 'commit 461c1a7d47 ("gpiolib: override irq_enable/disable")' gpiolib
overrides irqchip's irq_enable and irq_disable callbacks. If irq_disable
callback is implemented then genirq takes unlazy path to disable irq.

Underlying irqchip may not want to implement irq_disable callback to lazy
disable irq when client drivers invokes disable_irq(). By overriding
irq_disable callback, gpiolib ends up always unlazy disabling IRQ.

Allow gpiolib to lazy disable IRQs by overriding irq_disable callback only
if irqchip implemented irq_disable. In cases where irq_disable is not
implemented irq_mask is overridden. Similarly override irq_enable callback
only if irqchip implemented irq_enable otherwise irq_unmask is overridden.

Fixes: 461c1a7d47 ("gpiolib: override irq_enable/disable")
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Link: https://lore.kernel.org/r/1590253873-11556-2-git-send-email-mkshah@codeaurora.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Maulik Shah
2020-05-23 22:41:10 +05:30
committed by Linus Walleij
parent a34d5e5631
commit a8173820f4
2 changed files with 49 additions and 19 deletions
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13
include/linux/gpio/driver.h
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@@ -253,6 +253,19 @@ struct gpio_irq_chip {
* Store old irq_chip irq_disable callback
*/
void (*irq_disable)(struct irq_data *data);
/**
* @irq_unmask:
*
* Store old irq_chip irq_unmask callback
*/
void (*irq_unmask)(struct irq_data *data);
/**
* @irq_mask:
*
* Store old irq_chip irq_mask callback
*/
void (*irq_mask)(struct irq_data *data);
};
/**