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path: root/drivers/acpi/pci_irq.c
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Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r--drivers/acpi/pci_irq.c10
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;