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From patchwork Sat Mar 21 13:38:42 2020
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
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X-Patchwork-Submitter: Sungbo Eo <mans0n@gorani.run>
X-Patchwork-Id: 11451163
From: Sungbo Eo <mans0n@gorani.run>
To: linux-oxnas@groups.io, Linus Walleij <linus.walleij@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>, Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <maz@kernel.org>, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] irqchip/versatile-fpga: Apply clear-mask earlier
Date: Sat, 21 Mar 2020 22:38:42 +0900
Message-Id: <20200321133842.2408823-1-mans0n@gorani.run>
MIME-Version: 1.0
Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org>
Clear its own IRQs before the parent IRQ get enabled, so that the
remaining IRQs do not accidentally interrupt the parent IRQ controller.
This patch also fixes a reboot bug on OX820 SoC, where the remaining
rps-timer IRQ raises a GIC interrupt that is left pending. After that,
the rps-timer IRQ is cleared during driver initialization, and there's
no IRQ left in rps-irq when local_irq_enable() is called, which evokes
an error message "unexpected IRQ trap".
Fixes: bdd272cbb97a ("irqchip: versatile FPGA: support cascaded interrupts from DT")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Daniel Golle <daniel@makrotopia.org>
---
drivers/irqchip/irq-versatile-fpga.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c
index 70e2cfff8175..f1386733d3bc 100644
--- a/drivers/irqchip/irq-versatile-fpga.c
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -212,6 +212,9 @@ int __init fpga_irq_of_init(struct device_node *node,
if (of_property_read_u32(node, "valid-mask", &valid_mask))
valid_mask = 0;
+ writel(clear_mask, base + IRQ_ENABLE_CLEAR);
+ writel(clear_mask, base + FIQ_ENABLE_CLEAR);
+
/* Some chips are cascaded from a parent IRQ */
parent_irq = irq_of_parse_and_map(node, 0);
if (!parent_irq) {
@@ -221,9 +224,6 @@ int __init fpga_irq_of_init(struct device_node *node,
fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node);
- writel(clear_mask, base + IRQ_ENABLE_CLEAR);
- writel(clear_mask, base + FIQ_ENABLE_CLEAR);
-
/*
* On Versatile AB/PB, some secondary interrupts have a direct
* pass-thru to the primary controller for IRQs 20 and 22-31 which need
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