linux-kernel - [PATCH v8 05/11] ARM: Enable erratum 798181 for Broadcom Brahma-B15

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Date:	Mon, 21 Jul 2014 14:08:00 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
Cc:	Matt Porter <mporter@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Russell King <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Brian Norris <computersforpeace@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Will Deacon <will.deacon@....com>
Subject: [PATCH v8 05/11] ARM: Enable erratum 798181 for Broadcom Brahma-B15

From: Gregory Fong <gregory.0xf0@...il.com>

Broadcom Brahma-B15 (r0p0..r0p2) is also affected by Cortex-A15
erratum 798181, so enable the workaround for Brahma-B15.

Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
Acked-by: Marc Carino <marc.ceeeee@...il.com>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Will Deacon <will.deacon@....com>
---
 arch/arm/kernel/smp_tlb.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
index 95d063620b76..2e72be4f623e 100644
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -92,15 +92,19 @@ void erratum_a15_798181_init(void)
 	unsigned int midr = read_cpuid_id();
 	unsigned int revidr = read_cpuid(CPUID_REVIDR);
 
-	/* Cortex-A15 r0p0..r3p2 w/o ECO fix affected */
-	if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2 ||
-	    (revidr & 0x210) == 0x210) {
-		return;
-	}
-	if (revidr & 0x10)
-		erratum_a15_798181_handler = erratum_a15_798181_partial;
-	else
+	/* Brahma-B15 r0p0..r0p2 affected
+	 * Cortex-A15 r0p0..r3p2 w/o ECO fix affected */
+	if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2)
 		erratum_a15_798181_handler = erratum_a15_798181_broadcast;
+	else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr <= 0x413fc0f2 &&
+		 (revidr & 0x210) != 0x210) {
+		if (revidr & 0x10)
+			erratum_a15_798181_handler =
+				erratum_a15_798181_partial;
+		else
+			erratum_a15_798181_handler =
+				erratum_a15_798181_broadcast;
+	}
 }
 #endif
 
-- 
1.9.1

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