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Commit | Line | Data |
---|---|---|
00e5a55c BS |
1 | From: Tejun Heo <tj@kernel.org> |
2 | Subject: x86: disallow DAC for MCP51 PCI bridge | |
3 | References: bnc#463829 | |
4 | ||
5 | MCP51 corrupts DAC transfers. Disallow it. Reported by pgnet on | |
6 | bnc#463829. | |
7 | ||
8 | https://bugzilla.novell.com/show_bug.cgi?id=463829 | |
9 | ||
10 | Signed-off-by: Tejun Heo <tj@kernel.org> | |
11 | Reported-by: pgnet <pgnet.trash@gmail.com> | |
12 | Signed-off-by: Tejun Heo <teheo@suse.de> | |
13 | --- | |
14 | arch/x86/kernel/pci-dma.c | 14 ++++++++++++++ | |
15 | 1 file changed, 14 insertions(+) | |
16 | ||
17 | Index: linux-2.6.27-SLE11_BRANCH/arch/x86/kernel/pci-dma.c | |
18 | =================================================================== | |
19 | --- linux-2.6.27-SLE11_BRANCH.orig/arch/x86/kernel/pci-dma.c | |
20 | +++ linux-2.6.27-SLE11_BRANCH/arch/x86/kernel/pci-dma.c | |
21 | @@ -415,4 +415,18 @@ static __devinit void via_no_dac(struct | |
22 | } | |
23 | } | |
24 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac); | |
25 | + | |
26 | +/* | |
27 | + * MCP51 PCI bridge corrupts data for DAC. Disable it. Reported in | |
28 | + * bnc#463829. | |
29 | + */ | |
30 | +static __devinit void mcp51_no_dac(struct pci_dev *dev) | |
31 | +{ | |
32 | + if (forbid_dac == 0) { | |
33 | + printk(KERN_INFO | |
34 | + "PCI: MCP51 PCI bridge detected. Disabling DAC.\n"); | |
35 | + forbid_dac = 1; | |
36 | + } | |
37 | +} | |
38 | +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x026f, mcp51_no_dac); | |
39 | #endif |