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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH 4.9 092/167] irqchip: irq-xtensa-mx: fix initial IRQ affinity
Date:   Mon, 13 Jun 2022 12:09:26 +0200
Message-Id: <20220613094902.511252942@linuxfoundation.org>
In-Reply-To: <20220613094840.720778945@linuxfoundation.org>
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From: Max Filippov <jcmvbkbc@gmail.com>

commit a255ee29252066d621df5d6b420bf534c6ba5bc0 upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/irqchip/irq-xtensa-mx.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

--- a/drivers/irqchip/irq-xtensa-mx.c
+++ b/drivers/irqchip/irq-xtensa-mx.c
@@ -139,14 +139,25 @@ static struct irq_chip xtensa_mx_irq_chi
 	.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;
 }
 
@@ -156,8 +167,7 @@ static int __init xtensa_mx_init(struct
 	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);