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Subject[PATCH] ARM: keystone: add bus notifier to set dma_pfn_offset for pci devices
When PCI device driver such as that for e1000e tries to set dma mask
using dma_set_mask_and_coherent(), it fails because the dma_pfn_offset
is incorrect on a Keystone SoC. This patch fix this by adding a bus
notifier to set this correctly for PCI devices.

Signed-off-by: Murali Karicheri <>
arch/arm/mach-keystone/keystone.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index 7f352de..13afe95 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -15,6 +15,7 @@
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/memblock.h>
+#include <linux/pci.h>

#include <asm/setup.h>
#include <asm/mach/map.h>
@@ -54,6 +55,8 @@ static void __init keystone_init(void)
if (platform_nb.notifier_call)
bus_register_notifier(&platform_bus_type, &platform_nb);
+ if (platform_nb.notifier_call)
+ bus_register_notifier(&pci_bus_type, &platform_nb);
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);


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