linux-kernel - [PATCH] ARM: keystone: add bus notifier to set dma_pfn

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Date:	Fri, 10 Oct 2014 11:15:37 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <santosh.shilimkar@...com>
CC:	Murali Karicheri <m-karicheri2@...com>
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 <m-karicheri2@...com>
---
 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)
 	keystone_pm_runtime_init();
 	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);
 }
 
-- 
1.7.9.5

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