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authorStanislaw Gruszka <sgruszka@redhat.com>2010-10-05 18:11:40 -0400
committerDavid S. Miller <davem@davemloft.net>2010-10-05 18:11:40 -0400
commit392bd0cb000d4aac9e88e4f50823db85e7220688 (patch)
tree56611b32ae54dd751008c0144dc35a371b4fda9a /drivers/net/skge.c
parent0d164401354011e771c850ba1f04a6ae883f82ab (diff)
skge: add quirk to limit DMA
Skge devices installed on some Gigabyte motherboards are not able to perform 64 dma correctly due to board PCI implementation, so limit DMA to 32bit if such boards are detected. Bug was reported here: https://bugzilla.redhat.com/show_bug.cgi?id=447489 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Tested-by: Luya Tshimbalanga <luya@fedoraproject.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/skge.c')
-rw-r--r--drivers/net/skge.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 40e5c46e7571..465ae7e84507 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -43,6 +43,7 @@
43#include <linux/seq_file.h> 43#include <linux/seq_file.h>
44#include <linux/mii.h> 44#include <linux/mii.h>
45#include <linux/slab.h> 45#include <linux/slab.h>
46#include <linux/dmi.h>
46#include <asm/irq.h> 47#include <asm/irq.h>
47 48
48#include "skge.h" 49#include "skge.h"
@@ -3868,6 +3869,8 @@ static void __devinit skge_show_addr(struct net_device *dev)
3868 netif_info(skge, probe, skge->netdev, "addr %pM\n", dev->dev_addr); 3869 netif_info(skge, probe, skge->netdev, "addr %pM\n", dev->dev_addr);
3869} 3870}
3870 3871
3872static int only_32bit_dma;
3873
3871static int __devinit skge_probe(struct pci_dev *pdev, 3874static int __devinit skge_probe(struct pci_dev *pdev,
3872 const struct pci_device_id *ent) 3875 const struct pci_device_id *ent)
3873{ 3876{
@@ -3889,7 +3892,7 @@ static int __devinit skge_probe(struct pci_dev *pdev,
3889 3892
3890 pci_set_master(pdev); 3893 pci_set_master(pdev);
3891 3894
3892 if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) { 3895 if (!only_32bit_dma && !pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
3893 using_dac = 1; 3896 using_dac = 1;
3894 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); 3897 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
3895 } else if (!(err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))) { 3898 } else if (!(err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))) {
@@ -4147,8 +4150,21 @@ static struct pci_driver skge_driver = {
4147 .shutdown = skge_shutdown, 4150 .shutdown = skge_shutdown,
4148}; 4151};
4149 4152
4153static struct dmi_system_id skge_32bit_dma_boards[] = {
4154 {
4155 .ident = "Gigabyte nForce boards",
4156 .matches = {
4157 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co"),
4158 DMI_MATCH(DMI_BOARD_NAME, "nForce"),
4159 },
4160 },
4161 {}
4162};
4163
4150static int __init skge_init_module(void) 4164static int __init skge_init_module(void)
4151{ 4165{
4166 if (dmi_check_system(skge_32bit_dma_boards))
4167 only_32bit_dma = 1;
4152 skge_debug_init(); 4168 skge_debug_init();
4153 return pci_register_driver(&skge_driver); 4169 return pci_register_driver(&skge_driver);
4154} 4170}