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genirq: Introduce irq_chip_get/set_parent_state calls

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On certain QTI chipsets some GPIOs are direct-connect interrupts
to the GIC.

Even when GPIOs are not used for interrupt generation and interrupt
line is disabled, it does not prevent interrupt to get pending at
GIC_ISPEND. When drivers call enable_irq unwanted interrupt occures.

Introduce irq_chip_get/set_parent_state calls to clear pending irq
which can get called within irq_enable of child irq chip to clear
any pending irq before enabling.

Change-Id: Ie8559657bd8da926cc741514809ffe9adbd73a80
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
This commit is contained in:
Maulik Shah 2019-06-14 16:14:09 +05:30
parent 1041824b37
commit d923314622
2 changed files with 50 additions and 0 deletions
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6
include/linux/irq.h
View file

@ -599,6 +599,12 @@ extern int irq_chip_pm_put(struct irq_data *data);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
extern void handle_fasteoi_ack_irq(struct irq_desc *desc);
extern void handle_fasteoi_mask_irq(struct irq_desc *desc);
extern int irq_chip_set_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool val);
extern int irq_chip_get_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool *state);
extern void irq_chip_enable_parent(struct irq_data *data);
extern void irq_chip_disable_parent(struct irq_data *data);
extern void irq_chip_ack_parent(struct irq_data *data);

44
kernel/irq/chip.c
View file

@ -1233,6 +1233,50 @@ EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
#endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
/**
* irq_chip_set_parent_state - set the state of a parent interrupt.
* @data: Pointer to interrupt specific data
* @which: State to be restored (one of IRQCHIP_STATE_*)
* @val: Value corresponding to @which
*
*/
int irq_chip_set_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool val)
{
data = data->parent_data;
if (!data)
return 0;
if (data->chip->irq_set_irqchip_state)
return data->chip->irq_set_irqchip_state(data, which, val);
return 0;
}
EXPORT_SYMBOL(irq_chip_set_parent_state);
/**
* irq_chip_get_parent_state - get the state of a parent interrupt.
* @data: Pointer to interrupt specific data
* @which: one of IRQCHIP_STATE_* the caller wants to know
* @state: a pointer to a boolean where the state is to be stored
*
*/
int irq_chip_get_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool *state)
{
data = data->parent_data;
if (!data)
return 0;
if (data->chip->irq_get_irqchip_state)
return data->chip->irq_get_irqchip_state(data, which, state);
return 0;
}
EXPORT_SYMBOL(irq_chip_get_parent_state);
/**
* irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
* NULL)