[PATCH 4/7] MdeModulePkg/SdMmcPciHcDxe: enable 64-bit PCI DMA

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

PCI controller drivers must set the EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE
attribute if the controller supports 64-bit DMA addressing.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
index 0be081dad0bc..5de1dd6fd9e6 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
@@ -527,6 +527,7 @@ SdMmcPciHcDriverBindingStart (
   CARD_TYPE_DETECT_ROUTINE        *Routine;
   UINT32                          RoutineNum;
   BOOLEAN                         MediaPresent;
+  BOOLEAN                         Support64BitDma;
 
   DEBUG ((EFI_D_INFO, "SdMmcPciHcDriverBindingStart: Start\n"));
 
@@ -600,6 +601,7 @@ SdMmcPciHcDriverBindingStart (
     goto Done;
   }
 
+  Support64BitDma = TRUE;
   for (Slot = FirstBar; Slot < (FirstBar + SlotNum); Slot++) {
     Private->Slot[Slot].Enable = TRUE;
 
@@ -609,6 +611,8 @@ SdMmcPciHcDriverBindingStart (
     }
     DumpCapabilityReg (Slot, &Private->Capability[Slot]);
 
+    Support64BitDma &= Private->Capability[Slot].SysBus64;
+
     Status = SdMmcHcGetMaxCurrent (PciIo, Slot, &Private->MaxCurrent[Slot]);
     if (EFI_ERROR (Status)) {
       continue;
@@ -664,6 +668,22 @@ SdMmcPciHcDriverBindingStart (
   }
 
   //
+  // Enable 64-bit DMA support in the PCI layer if this controller
+  // supports it.
+  //
+  if (Support64BitDma) {
+    Status = PciIo->Attributes (
+                      PciIo,
+                      EfiPciIoAttributeOperationEnable,
+                      EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
+                      NULL
+                      );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_WARN, "SdMmcPciHcDriverBindingStart: failed to enable 64-bit DMA (%r)\n", Status));
+    }
+  }
+
+  //
   // Start the asynchronous I/O monitor
   //
   Status = gBS->CreateEvent (
-- 
2.7.4