linux-kernel - [PATCH v3 4/4] irqchip/sifive-plic: Fix T-HEAD PLIC edge trigger handling

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Date:   Thu, 30 Jun 2022 05:02:41 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>
Cc:     Guo Ren <guoren@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Samuel Holland <samuel@...lland.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH v3 4/4] 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@...renesas.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---

Changes in v3:
 - Rebased on top of the RZ/Five patches

 drivers/irqchip/irq-sifive-plic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 90e44367bee9..b3a36dca7f1b 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -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);
-- 
2.35.1