ARM: 7541/1: Add ARM ERRATA 775420 workaround
authorSimon Horman <horms@verge.net.au>
Fri, 28 Sep 2012 01:12:45 +0000 (02:12 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 21 Oct 2012 16:27:58 +0000 (09:27 -0700)
commit90e4ed1b7de612e4ed18029e61134ab2fea6233e
tree3e796aa4bb46f3f647b19685305a99fdae7e566c
parent023f18fee60cd9ef86c8299dd9debccad1f93351
ARM: 7541/1: Add ARM ERRATA 775420 workaround

commit 7253b85cc62d6ff84143d96fe6cd54f73736f4d7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm/Kconfig
arch/arm/mm/cache-v7.S