On ACPI ARM based systems the GIC interrupt controller and corresponding interrupt model permit only the high polarity for level interrupts. ACPI firmware describes PCI legacy IRQs through entries in the _PRT objects. Entries in the _PRT can be of two types: - Static: not configurable, trigger/polarity default to level-low, _PRT entry defines the global GSI interrupt number - Configurable: _PRT interrupt entry contains a reference to the corresponding PCI interrupt link device (that in turn provides the interrupt descriptor through its _CRS/_PRS methods) Configurable IRQ entries are not currently allowed by the ACPI specification on ARM, since they can only be used for interrupt pins that are routable, and ARM platforms GIC configurations do not allow dynamic IRQ routing, routing is statically laid out at synthesis time; therefore PCI interrupt links cannot be used for PCI legacy IRQ descriptions in the _PRT on ARM systems. On the other hand, current core ACPI code handling PCI legacy IRQs consider IRQ trigger/polarity for static _PRT entries as level-low. On ARM systems with a GIC interrupt controller and corresponding ACPI interrupt model this does not work in that GIC interrupt controller is only capable of handling level interrupts whose polarity is high (for PCI legacy IRQs - that are level-low by specification - this means that the legacy IRQs are inverted before reaching the interrupt controller pin), resulting in IRQ allocation failures such as: genirq: Setting trigger mode 8 for irq 18 failed (gic_set_type+0x0/0x48) Change the default polarity for PCI legacy IRQs to high on systems booting wth ACPI on platforms with a GIC interrupt controller model, fixing the discrepancy between specification and HW behaviour. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Cc: Punit Agrawal <punit.agrawal@xxxxxxx> Cc: Duc Dang <dhdang@xxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Sinan Kaya <okaya@xxxxxxxxxxxxxx> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Cc: Marc Zyngier <marc.zyngier@xxxxxxx> --- drivers/acpi/pci_irq.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 2c45dd3..c576a6f 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; -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
