5.5 patch to support _DMA restrictions/translations for ACPI objects, to properly support xHCI with a 4GB Pi via ACPI

_dma-for-every-acpi-dev.diff

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 33f71983e..f7f7114c4 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1076,12 +1076,13 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
        else
                size = 1ULL << 32;

-       if (dev_is_pci(dev)) {
-               ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);
-               if (ret == -ENODEV)
+       ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);
+       if (ret == -ENODEV) {
+               if (dev_is_pci(dev)) {
                        ret = rc_dma_get_range(dev, &size);
-       } else {
-               ret = nc_dma_get_range(dev, &size);
+               } else {
+                       ret = nc_dma_get_range(dev, &size);
+               }
        }

        if (!ret) {