KumiSystems/openwrtv4
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

mvebu: fix device I/O coherency issues

Browse source 
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-05-22 12:33:39 +02:00
parent 638a5682e1
commit 848cacb21d
1 changed files with 47 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
target/linux/mvebu/patches-4.4/024-mvebu-make-device-IO-strongly-ordered.patch Normal file
View file

@ -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