diff options
Diffstat (limited to 'drivers/acpi/pci_irq.c')
| -rw-r--r-- | drivers/acpi/pci_irq.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 2c45dd3acc17..c576a6fe4ebb 100644 --- a/drivers/acpi/pci_irq.c +++ b/drivers/acpi/pci_irq.c @@ -411,7 +411,15 @@ int acpi_pci_irq_enable(struct pci_dev *dev) int gsi; u8 pin; int triggering = ACPI_LEVEL_SENSITIVE; - int polarity = ACPI_ACTIVE_LOW; + /* + * On ARM systems with the GIC interrupt model, level interrupts + * are always polarity high by specification; PCI legacy + * IRQs lines are inverted before reaching the interrupt + * controller and must therefore be considered active high + * as default. + */ + int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ? + ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW; char *link = NULL; char link_desc[16]; int rc; |