This is the last step before enabling generic ACPI PCI host controller for ARM64. We need to take care of legacy IRQ mapping for non-MSI(X) PCI devices. pcibios_alloc_irq() evaluation is not sensitive to ACPI device enumeration order, so it is the best place to assign device's IRQs for ACPI boot method. Also, it does not hurt DT to be initialized form the same place.
NOTE: *This is going to be temporary solution*. There is ongoing work which aims for cleaning legacy IRQ allocation from arch specific code. We can consider this patch as the necessary evil which will be removed once cleanup series lands in mailnline in the near future.
Signed-off-by: Tomasz Nowicki tn@semihalf.com Suggested-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com --- arch/arm64/kernel/pci.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index 023b983..6e77e1b 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -52,11 +52,16 @@ int pcibios_enable_device(struct pci_dev *dev, int mask) }
/* - * Try to assign the IRQ number from DT when adding a new device + * Try to assign the IRQ number when probing a new device */ -int pcibios_add_device(struct pci_dev *dev) +int pcibios_alloc_irq(struct pci_dev *dev) { - dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); + if (acpi_disabled) + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); +#ifdef CONFIG_ACPI + else + return acpi_pci_irq_enable(dev); +#endif
return 0; }