diff --git a/src/soc/amd/common/block/iommu/iommu.c b/src/soc/amd/common/block/iommu/iommu.c
index ad1d774baf..78ec881b49 100644
--- a/src/soc/amd/common/block/iommu/iommu.c
+++ b/src/soc/amd/common/block/iommu/iommu.c
@@ -1,11 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <console/console.h>
 #include <device/device.h>
 #include <device/pci.h>
 #include <lib.h>
 
 #define IOMMU_CAP_BASE_LO 0x44
 #define IOMMU_CAP_BASE_HI 0x48
+#define IOMMU_ENABLE (1 << 0)
 
 static void iommu_read_resources(struct device *dev)
 {
@@ -23,6 +25,17 @@ static void iommu_read_resources(struct device *dev)
 	res->flags = IORESOURCE_MEM;
 }
 
+
+static void iommu_enable_resources(struct device *dev)
+{
+	uint32_t base = pci_read_config32(dev, IOMMU_CAP_BASE_LO);
+	base |= IOMMU_ENABLE;
+	pci_write_config32(dev, IOMMU_CAP_BASE_LO, base);
+	printk(BIOS_DEBUG, "%s -> mmio enable: %08X", __func__,
+	       pci_read_config32(dev, IOMMU_CAP_BASE_LO));
+	pci_dev_enable_resources(dev);
+}
+
 #if CONFIG(HAVE_ACPI_TABLES)
 static const char *iommu_acpi_name(const struct device *dev)
 {
@@ -33,7 +46,7 @@ static const char *iommu_acpi_name(const struct device *dev)
 struct device_operations amd_iommu_ops = {
 	.read_resources = iommu_read_resources,
 	.set_resources = pci_dev_set_resources,
-	.enable_resources = pci_dev_enable_resources,
+	.enable_resources = iommu_enable_resources,
 	.ops_pci = &pci_dev_ops_pci,
 #if CONFIG(HAVE_ACPI_TABLES)
 	.acpi_name = iommu_acpi_name,