X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdeModulePkg%2FBus%2FPci%2FEhciDxe%2FEhci.c;h=c7a6a400cff241ccbcfe6d83e330e169a11b676a;hp=4e9e05f0e43134403c89557f84488381721eafe9;hb=167c3fb45674c274219b3af0bc811992cd4d6116;hpb=a2c9b0873a7713df3d491307009b63ad0acd52f0

diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c b/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
index 4e9e05f0e4..c7a6a400cf 100644
--- a/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
@@ -89,7 +89,7 @@ EhcGetCapability (
 
   *MaxSpeed       = EFI_USB_SPEED_HIGH;
   *PortNumber     = (UINT8) (Ehc->HcStructParams & HCSP_NPORTS);
-  *Is64BitCapable = (UINT8) (Ehc->HcCapParams & HCCP_64BIT);
+  *Is64BitCapable = (UINT8) Ehc->Support64BitDma;
 
   DEBUG ((EFI_D_INFO, "EhcGetCapability: %d ports, 64 bit %d\n", *PortNumber, *Is64BitCapable));
 
@@ -1877,6 +1877,26 @@ EhcDriverBindingStart (
     goto CLOSE_PCIIO;
   }
 
+  //
+  // Enable 64-bit DMA support in the PCI layer if this controller
+  // supports it.
+  //
+  if (EHC_BIT_IS_SET (Ehc->HcCapParams, HCCP_64BIT)) {
+    Status = PciIo->Attributes (
+                      PciIo,
+                      EfiPciIoAttributeOperationEnable,
+                      EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
+                      NULL
+                      );
+    if (!EFI_ERROR (Status)) {
+      Ehc->Support64BitDma = TRUE;
+    } else {
+      DEBUG ((EFI_D_WARN,
+        "%a: failed to enable 64-bit DMA on 64-bit capable controller @ %p (%r)\n",
+        __FUNCTION__, Controller, Status));
+    }
+  }
+
   Status = gBS->InstallProtocolInterface (
                   &Controller,
                   &gEfiUsb2HcProtocolGuid,