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ARM: 6201/1: RealView: Do not use outer_sync() on ARM11MPCore boards with L220

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RealView boards with certain revisions of the L220 cache controller (ARM11*
processors only) may have issues (hardware deadlock) with the recent changes to
the mb() barrier implementation (DSB followed by an L2 cache sync). The patch
redefines the RealView ARM11MPCore mandatory barriers without the outer_sync()
call.

Cc: <stable@kernel.org>
Tested-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2010-07-01 13:21:47 +01:00 committed by Russell King
parent 00952d8f14
commit 2503a5ecd8
2 changed files with 10 additions and 0 deletions
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2
arch/arm/mach-realview/Kconfig
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@ -18,6 +18,7 @@ config REALVIEW_EB_ARM11MP
bool "Support ARM11MPCore tile" bool "Support ARM11MPCore tile"
depends on MACH_REALVIEW_EB depends on MACH_REALVIEW_EB
select CPU_V6 select CPU_V6
select ARCH_HAS_BARRIERS if SMP
help help
Enable support for the ARM11MPCore tile on the Realview platform. Enable support for the ARM11MPCore tile on the Realview platform.
@ -35,6 +36,7 @@ config MACH_REALVIEW_PB11MP
select CPU_V6 select CPU_V6
select ARM_GIC select ARM_GIC
select HAVE_PATA_PLATFORM select HAVE_PATA_PLATFORM
select ARCH_HAS_BARRIERS if SMP
help help
Include support for the ARM(R) RealView MPCore Platform Baseboard. Include support for the ARM(R) RealView MPCore Platform Baseboard.
PB11MPCore is a platform with an on-board ARM11MPCore and has PB11MPCore is a platform with an on-board ARM11MPCore and has

8
arch/arm/mach-realview/include/mach/barriers.h Normal file
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@ -0,0 +1,8 @@
/*
* Barriers redefined for RealView ARM11MPCore platforms with L220 cache
* controller to work around hardware errata causing the outer_sync()
* operation to deadlock the system.
*/
#define mb() dsb()
#define rmb() dmb()
#define wmb() mb()