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| author | Ingo Molnar <mingo@elte.hu> | 2008-11-10 09:16:27 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-10 09:16:27 +0100 |
| commit | 4ecd33d930591d41fe356160593a9076467b961c (patch) | |
| tree | b9051a334540bbce38db1b2b03cebb4cf1d51f73 /arch/x86/kernel/pci-dma.c | |
| parent | 7d5a78cd98c3a5eb83bd6a061c5ea6ef1e9b8fcb (diff) | |
| parent | f7160c7573615ec82c691e294cf80d920b5d588d (diff) | |
Merge commit 'v2.6.28-rc4' into x86/apic
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 |