diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/quirks.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index f5d09f4066f3..fb544d6d29f6 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2924,6 +2924,40 @@ static void do_one_fixup_debug(void (*fn)(struct pci_dev *dev), struct pci_dev * duration); } +/* + * Some BIOS implementations leave the Intel GPU interrupts enabled, + * even though no one is handling them (f.e. i915 driver is never loaded). + * Additionally the interrupt destination is not set up properly + * and the interrupt ends up -somewhere-. + * + * These spurious interrupts are "sticky" and the kernel disables + * the (shared) interrupt line after 100.000+ generated interrupts. + * + * Fix it by disabling the still enabled interrupts. + * This resolves crashes often seen on monitor unplug. + */ +#define I915_DEIER_REG 0x4400c +static void __devinit disable_igfx_irq(struct pci_dev *dev) +{ + void __iomem *regs = pci_iomap(dev, 0, 0); + if (regs == NULL) { + dev_warn(&dev->dev, "igfx quirk: Can't iomap PCI device\n"); + return; + } + + /* Check if any interrupt line is still enabled */ + if (readl(regs + I915_DEIER_REG) != 0) { + dev_warn(&dev->dev, "BIOS left Intel GPU interrupts enabled; " + "disabling\n"); + + writel(0, regs + I915_DEIER_REG); + } + + pci_iounmap(dev, regs); +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0102, disable_igfx_irq); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq); + static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end) { |
