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-rw-r--r--arch/arm/mach-mvebu/coherency.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/mach-mvebu/coherency.c b/arch/arm/mach-mvebu/coherency.c
index 3585cb394e9b..ccef8806bb58 100644
--- a/arch/arm/mach-mvebu/coherency.c
+++ b/arch/arm/mach-mvebu/coherency.c
@@ -190,6 +190,13 @@ static void __init armada_375_380_coherency_init(struct device_node *np)
arch_ioremap_caller = armada_pcie_wa_ioremap_caller;
/*
+ * We should switch the PL310 to I/O coherency mode only if
+ * I/O coherency is actually enabled.
+ */
+ if (!coherency_available())
+ return;
+
+ /*
* Add the PL310 property "arm,io-coherent". This makes sure the
* outer sync operation is not used, which allows to
* workaround the system erratum that causes deadlocks when
@@ -246,9 +253,14 @@ static int coherency_type(void)
return type;
}
+/*
+ * As a precaution, we currently completely disable hardware I/O
+ * coherency, until enough testing is done with automatic I/O
+ * synchronization barriers to validate that it is a proper solution.
+ */
int coherency_available(void)
{
- return coherency_type() != COHERENCY_FABRIC_TYPE_NONE;
+ return false;
}
int __init coherency_init(void)