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Date:   Wed, 04 May 2022 16:15:13 -0000
From:   "irqchip-bot for Max Filippov" <tip-bot2@linutronix.de>
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To:     linux-kernel@vger.kernel.org
Subject: [irqchip: irq/irqchip-next] irqchip/xtensa-mx: Fix initial IRQ
 affinity in non-SMP setup
Cc:     stable@vger.kernel.org, Max Filippov <jcmvbkbc@gmail.com>,
        Marc Zyngier <maz@kernel.org>, tglx@linutronix.de
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The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     168f633b1722597673e5aa5a6c7721191a9d221f
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/168f633b1722597673e5aa5a6c7721191a9d221f
Author:        Max Filippov <jcmvbkbc@gmail.com>
AuthorDate:    Tue, 26 Apr 2022 09:19:12 -07:00
Committer:     Marc Zyngier <maz@kernel.org>
CommitterDate: Wed, 04 May 2022 16:35:38 +01:00

irqchip/xtensa-mx: Fix initial IRQ affinity in non-SMP setup

When irq-xtensa-mx chip is used in non-SMP configuration its
irq_set_affinity callback is not called leaving IRQ affinity set empty.
As a result IRQ delivery does not work in that configuration.
Initialize IRQ affinity of the xtensa MX interrupt distributor to CPU 0
for all external IRQ lines.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220426161912.1113784-1-jcmvbkbc@gmail.com
---
 drivers/irqchip/irq-xtensa-mx.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-xtensa-mx.c b/drivers/irqchip/irq-xtensa-mx.c
index 2793333..8c581c9 100644
--- a/drivers/irqchip/irq-xtensa-mx.c
+++ b/drivers/irqchip/irq-xtensa-mx.c
@@ -151,14 +151,25 @@ static struct irq_chip xtensa_mx_irq_chip = {
 	.irq_set_affinity = xtensa_mx_irq_set_affinity,
 };
 
+static void __init xtensa_mx_init_common(struct irq_domain *root_domain)
+{
+	unsigned int i;
+
+	irq_set_default_host(root_domain);
+	secondary_init_irq();
+
+	/* Initialize default IRQ routing to CPU 0 */
+	for (i = 0; i < XCHAL_NUM_EXTINTERRUPTS; ++i)
+		set_er(1, MIROUT(i));
+}
+
 int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent)
 {
 	struct irq_domain *root_domain =
 		irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
 				&xtensa_mx_irq_domain_ops,
 				&xtensa_mx_irq_chip);
-	irq_set_default_host(root_domain);
-	secondary_init_irq();
+	xtensa_mx_init_common(root_domain);
 	return 0;
 }
 
@@ -168,8 +179,7 @@ static int __init xtensa_mx_init(struct device_node *np,
 	struct irq_domain *root_domain =
 		irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops,
 				&xtensa_mx_irq_chip);
-	irq_set_default_host(root_domain);
-	secondary_init_irq();
+	xtensa_mx_init_common(root_domain);
 	return 0;
 }
 IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init);