src/patches/suse-2.6.27.31/patches.arch/x86-mcp51-no-dac

   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