linux-kernel - [PATCH 1/2] irqchip/armada-370-xp: Do not touch Performance Counter Overflow on A375, A38x, A39x

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Message-Id: <20220425113706.29310-1-pali@kernel.org>
Date:   Mon, 25 Apr 2022 13:37:05 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] irqchip/armada-370-xp: Do not touch Performance Counter Overflow on A375, A38x, A39x

Register ARMADA_370_XP_INT_FABRIC_MASK_OFFS is Armada 370 and XP specific
and on new Armada platforms it has different meaning. It does not configure
Performance Counter Overflow interrupt masking. So do not touch this
register on non-A370/XP platforms (A375, A38x and A39x).

Signed-off-by: Pali Rohár <pali@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/irqchip/irq-armada-370-xp.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 5b8d571c041d..1120084cba09 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -308,7 +308,16 @@ static inline int armada_370_xp_msi_init(struct device_node *node,
 
 static void armada_xp_mpic_perf_init(void)
 {
-	unsigned long cpuid = cpu_logical_map(smp_processor_id());
+	unsigned long cpuid;
+
+	/*
+	 * This Performance Counter Overflow interrupt is specific for
+	 * Armada 370 and XP. It is not available on Armada 375, 38x and 39x.
+	 */
+	if (!of_machine_is_compatible("marvell,armada-370-xp"))
+		return;
+
+	cpuid = cpu_logical_map(smp_processor_id());
 
 	/* Enable Performance Counter Overflow interrupts */
 	writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid),
-- 
2.20.1