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irqchip/sifive-plic: Fix T-HEAD PLIC edge trigger handling 

The T-HEAD PLIC ignores additional edges seen while an edge-triggered
interrupt is being handled. Because of this behavior, the driver needs
to complete edge-triggered interrupts in the .irq_ack callback before
handling them, instead of in the .irq_eoi callback afterward. Otherwise,
it could miss some interrupts.

Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220630100241.35233-5-samuel@sholland.org
This commit is contained in:
Samuel Holland 2022-06-30 05:02:41 -05:00 committed by Marc Zyngier
parent d60df7fd22
commit 5873ba5591
1 changed files with 1 additions and 1 deletions
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2
drivers/irqchip/irq-sifive-plic.c
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@ -474,7 +474,6 @@ static int __init plic_init(struct device_node *node,
IRQCHIP_DECLARE(sifive_plic, "sifive,plic-1.0.0", plic_init);
IRQCHIP_DECLARE(riscv_plic0, "riscv,plic0", plic_init); /* for legacy systems */
IRQCHIP_DECLARE(thead_c900_plic, "thead,c900-plic", plic_init); /* for firmware driver */
static int __init plic_edge_init(struct device_node *node,
struct device_node *parent)
@ -483,3 +482,4 @@ static int __init plic_edge_init(struct device_node *node,
}
IRQCHIP_DECLARE(andestech_nceplic100, "andestech,nceplic100", plic_edge_init);
IRQCHIP_DECLARE(thead_c900_plic, "thead,c900-plic", plic_edge_init);