2010-07-07 11:12:45 +00:00
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From: Tejun Heo <tj@kernel.org>
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Subject: x86: disallow DAC for MCP51 PCI bridge
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References: bnc#463829
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Patch-mainline: not yet
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MCP51 corrupts DAC transfers. Disallow it. Reported by pgnet on
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bnc#463829.
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https://bugzilla.novell.com/show_bug.cgi?id=463829
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Signed-off-by: Tejun Heo <tj@kernel.org>
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Reported-by: pgnet <pgnet.trash@gmail.com>
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Signed-off-by: Tejun Heo <teheo@suse.de>
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---
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arch/x86/kernel/pci-dma.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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--- a/arch/x86/kernel/pci-dma.c
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+++ b/arch/x86/kernel/pci-dma.c
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2011-04-19 20:09:59 +00:00
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@@ -322,4 +322,18 @@ static __devinit void via_no_dac(struct
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2010-07-07 11:12:45 +00:00
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}
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}
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
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+
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+/*
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+ * MCP51 PCI bridge corrupts data for DAC. Disable it. Reported in
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+ * bnc#463829.
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+ */
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+static __devinit void mcp51_no_dac(struct pci_dev *dev)
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+{
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+ if (forbid_dac == 0) {
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+ printk(KERN_INFO
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+ "PCI: MCP51 PCI bridge detected. Disabling DAC.\n");
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+ forbid_dac = 1;
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+ }
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+}
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x026f, mcp51_no_dac);
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#endif
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