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authorWill Deacon <will.deacon@arm.com>2011-09-15 11:45:15 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-03 11:41:06 -0700
commit85fd323003d5fe4d5c798688f016ab0eda0c9dcf (patch)
tree4917cc663c26b87a79413f3607efe29eb9b14d9a /arch/arm/Kconfig
parent017a4b549759497c802c12c5982cf06f93806e60 (diff)
ARM: 7091/1: errata: D-cache line maintenance operation by MVA may not succeed
commit f630c1bdfbf8fe423325beaf60027cfc7fd7c610 upstream. This patch implements a workaround for erratum 764369 affecting Cortex-A9 MPCore with two or more processors (all current revisions). Under certain timing circumstances, a data cache line maintenance operation by MVA targeting an Inner Shareable memory region may fail to proceed up to either the Point of Coherency or to the Point of Unification of the system. This workaround adds a DSB instruction before the relevant cache maintenance functions and sets a specific bit in the diagnostic control register of the SCU. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/arm/Kconfig')
-rw-r--r--arch/arm/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9adc278a22ab..91c84cbefcf2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1298,6 +1298,20 @@ source "drivers/pci/Kconfig"
source "drivers/pcmcia/Kconfig"
+config ARM_ERRATA_764369
+ bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
+ depends on CPU_V7 && SMP
+ help
+ This option enables the workaround for erratum 764369
+ affecting Cortex-A9 MPCore with two or more processors (all
+ current revisions). Under certain timing circumstances, a data
+ cache line maintenance operation by MVA targeting an Inner
+ Shareable memory region may fail to proceed up to either the
+ Point of Coherency or to the Point of Unification of the
+ system. This workaround adds a DSB instruction before the
+ relevant cache maintenance functions and sets a specific bit
+ in the diagnostic control register of the SCU.
+
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