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