diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
index 0be8828abfcc..d328e9f867c4 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.c
@@ -60,7 +60,8 @@ SD_MMC_HC_PRIVATE_DATA gSdMmcPciHcTemplate = {
   {                                 // MaxCurrent
     0,
   },
-  0                                 // ControllerVersion
+  0,                                // ControllerVersion
+  NULL                              // Override
 };
 
 SD_DEVICE_PATH    mSdDpTemplate = {
@@ -213,6 +214,88 @@ Done:
   return;
 }
 
+STATIC
+EFI_STATUS
+SdMmcPciHcResetHost (
+  IN  SD_MMC_HC_PRIVATE_DATA          *Private,
+  IN  UINT8                           Slot
+  )
+{
+  EFI_STATUS    Status;
+
+  if (Private->Override != NULL &&
+      Private->Override->InvokeHook != NULL) {
+    Status = Private->Override->InvokeHook (
+                                  Private->ControllerHandle,
+                                  Slot,
+                                  SD_MMC_OVERRIDE_RESET_PRE_HOOK);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_WARN, "%a: SD/MMC pre reset hook failed - %r\n",
+        __FUNCTION__, Status));
+      return Status;
+    }
+  }
+
+  Status = SdMmcHcReset (Private->PciIo, Slot);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (Private->Override != NULL &&
+      Private->Override->InvokeHook != NULL) {
+    Status = Private->Override->InvokeHook (
+                                  Private->ControllerHandle,
+                                  Slot,
+                                  SD_MMC_OVERRIDE_RESET_POST_HOOK);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_WARN, "%a: SD/MMC post reset hook failed - %r\n",
+        __FUNCTION__, Status));
+    }
+  }
+  return Status;
+}
+
+STATIC
+EFI_STATUS
+SdMmcPciHcInitHost (
+  IN  SD_MMC_HC_PRIVATE_DATA          *Private,
+  IN  UINT8                           Slot
+  )
+{
+  EFI_STATUS    Status;
+
+  if (Private->Override != NULL &&
+      Private->Override->InvokeHook != NULL) {
+    Status = Private->Override->InvokeHook (
+                                  Private->ControllerHandle,
+                                  Slot,
+                                  SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_WARN, "%a: SD/MMC pre init hook failed - %r\n",
+        __FUNCTION__, Status));
+      return Status;
+    }
+  }
+
+  Status = SdMmcHcInitHost (Private->PciIo, Slot, Private->Capability[Slot]);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (Private->Override != NULL &&
+      Private->Override->InvokeHook != NULL) {
+    Status = Private->Override->InvokeHook (
+                                  Private->ControllerHandle,
+                                  Slot,
+                                  SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_WARN, "%a: SD/MMC post init hook failed - %r\n",
+        __FUNCTION__, Status));
+    }
+  }
+  return Status;
+}
+
 /**
   Sd removable device enumeration callback function when the timer event is signaled.
 
@@ -281,14 +364,14 @@ SdMmcPciHcEnumerateDevice (
         //
         // Reset the specified slot of the SD/MMC Pci Host Controller
         //
-        Status = SdMmcHcReset (Private->PciIo, Slot);
+        Status = SdMmcPciHcResetHost (Private, Slot);
         if (EFI_ERROR (Status)) {
           continue;
         }
         //
         // Reinitialize slot and restart identification process for the new attached device
         //
-        Status = SdMmcHcInitHost (Private->PciIo, Slot, Private->Capability[Slot]);
+        Status = SdMmcPciHcInitHost (Private, Slot);
         if (EFI_ERROR (Status)) {
           continue;
         }
@@ -601,6 +684,12 @@ SdMmcPciHcDriverBindingStart (
     goto Done;
   }
 
+  Status = gBS->HandleProtocol (Controller, &gEdkiiSdMmcOverrideProtocolGuid,
+                  (VOID **)&Private->Override);
+  if (!EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a: using SD/MMC override protocol\n", __FUNCTION__));
+  }
+
   Support64BitDma = TRUE;
   for (Slot = FirstBar; Slot < (FirstBar + SlotNum); Slot++) {
     Private->Slot[Slot].Enable = TRUE;
@@ -609,6 +698,18 @@ SdMmcPciHcDriverBindingStart (
     if (EFI_ERROR (Status)) {
       continue;
     }
+    if (Private->Override != NULL &&
+        Private->Override->OverrideCapability != NULL) {
+      Status = Private->Override->OverrideCapability (
+                                    Controller,
+                                    Slot,
+                                    &Private->Capability[Slot]);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_WARN, "%a: Failed to override capability - %r\n",
+          __FUNCTION__, Status));
+        continue;
+      }
+    }
     DumpCapabilityReg (Slot, &Private->Capability[Slot]);
 
     Support64BitDma &= Private->Capability[Slot].SysBus64;
@@ -627,7 +728,7 @@ SdMmcPciHcDriverBindingStart (
     //
     // Reset the specified slot of the SD/MMC Pci Host Controller
     //
-    Status = SdMmcHcReset (PciIo, Slot);
+    Status = SdMmcPciHcResetHost (Private, Slot);
     if (EFI_ERROR (Status)) {
       continue;
     }
@@ -642,7 +743,7 @@ SdMmcPciHcDriverBindingStart (
       continue;
     }
 
-    Status = SdMmcHcInitHost (PciIo, Slot, Private->Capability[Slot]);
+    Status = SdMmcPciHcInitHost (Private, Slot);
     if (EFI_ERROR (Status)) {
       continue;
     }
diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h
index 6a2a27969936..b51e0529f885 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h
@@ -35,6 +35,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Protocol/DriverBinding.h>
 #include <Protocol/ComponentName.h>
 #include <Protocol/ComponentName2.h>
+#include <Protocol/SdMmcOverride.h>
 #include <Protocol/SdMmcPassThru.h>
 
 #include "SdMmcPciHci.h"
@@ -115,6 +116,11 @@ typedef struct {
   UINT64                              MaxCurrent[SD_MMC_HC_MAX_SLOT];
 
   UINT32                              ControllerVersion;
+
+  //
+  // Optional protocol to deal with non-standard SDHCI implementations
+  //
+  SD_MMC_OVERRIDE                     *Override;
 } SD_MMC_HC_PRIVATE_DATA;
 
 #define SD_MMC_HC_TRB_SIG             SIGNATURE_32 ('T', 'R', 'B', 'T')
diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.inf b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.inf
index e26e6a098c17..154ce45d8223 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.inf
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.inf
@@ -48,6 +48,7 @@ [Sources]
 
 [Packages]
   MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
 
 [LibraryClasses]
   DevicePathLib
@@ -61,6 +62,7 @@ [LibraryClasses]
   DebugLib
 
 [Protocols]
+  gEdkiiSdMmcOverrideProtocolGuid               ## SOMETIMES_CONSUMES
   gEfiDevicePathProtocolGuid                    ## TO_START
   gEfiPciIoProtocolGuid                         ## TO_START
   gEfiSdMmcPassThruProtocolGuid                 ## BY_START
