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authorFelix Fietkau <nbd@nbd.name>2016-05-22 12:33:39 +0200
committerFelix Fietkau <nbd@nbd.name>2016-05-22 12:34:06 +0200
commit848cacb21db4e977635087d1fa2691b7c67eb79d (patch)
tree8ef36ee89ffe5e2573687b4ed78b2813087856f5
parent638a5682e1e66697649f89cb594b58a4ab0161b1 (diff)
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mvebu: fix device I/O coherency issues
Signed-off-by: Felix Fietkau <nbd@nbd.name>
-rw-r--r--target/linux/mvebu/patches-4.4/024-mvebu-make-device-IO-strongly-ordered.patch47
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.4/024-mvebu-make-device-IO-strongly-ordered.patch b/target/linux/mvebu/patches-4.4/024-mvebu-make-device-IO-strongly-ordered.patch
new file mode 100644
index 0000000..dc66997
--- /dev/null
+++ b/target/linux/mvebu/patches-4.4/024-mvebu-make-device-IO-strongly-ordered.patch
@@ -0,0 +1,47 @@
+On Cortex-A9 based Marvell SoCs, when HW I/O coherency is enabled, all
+non-RAM space needs to be mapped strongly ordered.
+In upstream this was added for PCIe I/O only, this change expands it
+to cover all device memory. Fixes issues with CESA.
+Based on patch from Thomas Petazzoni.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+
+--- a/arch/arm/mach-mvebu/coherency.c
++++ b/arch/arm/mach-mvebu/coherency.c
+@@ -162,22 +162,16 @@ exit:
+ }
+
+ /*
+- * This ioremap hook is used on Armada 375/38x to ensure that PCIe
++ * This ioremap hook is used on Armada 375/38x to ensure that all non-RAM
+ * memory areas are mapped as MT_UNCACHED instead of MT_DEVICE. This
+- * is needed as a workaround for a deadlock issue between the PCIe
++ * is needed as a workaround for a deadlock issue between the bus
+ * interface and the cache controller.
+ */
+ static void __iomem *
+-armada_pcie_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
+- unsigned int mtype, void *caller)
++armada_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
++ unsigned int mtype, void *caller)
+ {
+- struct resource pcie_mem;
+-
+- mvebu_mbus_get_pcie_mem_aperture(&pcie_mem);
+-
+- if (pcie_mem.start <= phys_addr && (phys_addr + size) <= pcie_mem.end)
+- mtype = MT_UNCACHED;
+-
++ mtype = MT_UNCACHED;
+ return __arm_ioremap_caller(phys_addr, size, mtype, caller);
+ }
+
+@@ -186,7 +180,7 @@ static void __init armada_375_380_cohere
+ struct device_node *cache_dn;
+
+ coherency_cpu_base = of_iomap(np, 0);
+- arch_ioremap_caller = armada_pcie_wa_ioremap_caller;
++ arch_ioremap_caller = armada_wa_ioremap_caller;
+
+ /*
+ * We should switch the PL310 to I/O coherency mode only if