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authorSimon Horman <horms@verge.net.au>2012-09-28 02:12:45 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-09-28 21:11:49 +0100
commit7253b85cc62d6ff84143d96fe6cd54f73736f4d7 (patch)
tree9950244b1b69fa27bee5ebcded6ff3ca49b4a28b /arch/arm/mm/cache-v7.S
parent63994137eb53bb0fc42ad180c0ce509d3eb3bdc9 (diff)
downloadblackbird-op-linux-7253b85cc62d6ff84143d96fe6cd54f73736f4d7.tar.gz
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ARM: 7541/1: Add ARM ERRATA 775420 workaround
arm: Add ARM ERRATA 775420 workaround Workaround for the 775420 Cortex-A9 (r2p2, r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance operation aborts with MMU exception, it might cause the processor to deadlock. This workaround puts DSB before executing ISB if an abort may occur on cache maintenance. Based on work by Kouei Abe and feedback from Catalin Marinas. Signed-off-by: Kouei Abe <kouei.abe.cp@rms.renesas.com> [ horms@verge.net.au: Changed to implementation suggested by catalin.marinas@arm.com ] Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/cache-v7.S')
-rw-r--r--arch/arm/mm/cache-v7.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
index 39e3fb3db801..3b172275262e 100644
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@@ -211,6 +211,9 @@ ENTRY(v7_coherent_user_range)
* isn't mapped, fail with -EFAULT.
*/
9001:
+#ifdef CONFIG_ARM_ERRATA_775420
+ dsb
+#endif
mov r0, #-EFAULT
mov pc, lr
UNWIND(.fnend )
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