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| author | Ingo Molnar <mingo@elte.hu> | 2008-11-12 12:39:21 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-12 12:39:21 +0100 |
| commit | 708b8eae0fd532af73ea8350e6dcc10255ff7376 (patch) | |
| tree | f336436934fd79bc91aff7112a9beb10bc4e839f /arch/x86/kernel/pci-dma.c | |
| parent | d98d38f2014ab79f28c126ff175d034891f7aefc (diff) | |
| parent | f21f237cf55494c3a4209de323281a3b0528da10 (diff) | |
Merge branch 'linus' into core/locking
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 1972266e8ba..19262482021 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -9,6 +9,8 @@ #include <asm/calgary.h> #include <asm/amd_iommu.h> +static int forbid_dac __read_mostly; + struct dma_mapping_ops *dma_ops; EXPORT_SYMBOL(dma_ops); @@ -291,3 +293,17 @@ void pci_iommu_shutdown(void) } /* Must execute after PCI subsystem */ fs_initcall(pci_iommu_init); + +#ifdef CONFIG_PCI +/* Many VIA bridges seem to corrupt data for DAC. Disable it here */ + +static __devinit void via_no_dac(struct pci_dev *dev) +{ + if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) { + printk(KERN_INFO "PCI: VIA PCI bridge detected." + "Disabling DAC.\n"); + forbid_dac = 1; + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac); +#endif |