diff --git a/EmbeddedPkg/Universal/MmcDxe/Mmc.h b/EmbeddedPkg/Universal/MmcDxe/Mmc.h
index 112bc472aa..fb3f6c9cba 100644
--- a/EmbeddedPkg/Universal/MmcDxe/Mmc.h
+++ b/EmbeddedPkg/Universal/MmcDxe/Mmc.h
@@ -55,6 +55,11 @@
 #define MMC_R0_STATE_TRAN       4
 #define MMC_R0_STATE_DATA       5
 
+#define EMMC_CMD6_ARG_ACCESS(x)             (((x) & 0x3) << 24)
+#define EMMC_CMD6_ARG_INDEX(x)              (((x) & 0xFF) << 16)
+#define EMMC_CMD6_ARG_VALUE(x)              (((x) & 0xFF) << 8)
+#define EMMC_CMD6_ARG_CMD_SET(x)            (((x) & 0x7) << 0)
+
 typedef enum {
   UNKNOWN_CARD,
   MMC_CARD,              //MMC card
diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c b/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
index 9aefb264a8..decfd543cc 100644
--- a/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
@@ -25,8 +25,108 @@ typedef union {
 #define EMMC_CARD_SIZE          512
 #define EMMC_ECSD_SIZE_OFFSET   53
 
+#define EXTCSD_BUS_WIDTH        183
+#define EXTCSD_HS_TIMING        185
+
+#define EMMC_TIMING_BACKWARD    0
+#define EMMC_TIMING_HS          1
+#define EMMC_TIMING_HS200       2
+#define EMMC_TIMING_HS400       3
+
+#define EMMC_BUS_WIDTH_1BIT     0
+#define EMMC_BUS_WIDTH_4BIT     1
+#define EMMC_BUS_WIDTH_8BIT     2
+#define EMMC_BUS_WIDTH_DDR_4BIT 5
+#define EMMC_BUS_WIDTH_DDR_8BIT 6
+
+#define EMMC_SWITCH_ERROR       (1 << 7)
+
+#define DEVICE_STATE(x)         (((x) >> 9) & 0xf)
+typedef enum _EMMC_DEVICE_STATE {
+  EMMC_IDLE_STATE = 0,
+  EMMC_READY_STATE,
+  EMMC_IDENT_STATE,
+  EMMC_STBY_STATE,
+  EMMC_TRAN_STATE,
+  EMMC_DATA_STATE,
+  EMMC_RCV_STATE,
+  EMMC_PRG_STATE,
+  EMMC_DIS_STATE,
+  EMMC_BTST_STATE,
+  EMMC_SLP_STATE
+} EMMC_DEVICE_STATE;
+
 UINT32 mEmmcRcaCount = 0;
 
+STATIC
+EFI_STATUS
+EFIAPI
+EmmcGetDeviceState (
+  IN  MMC_HOST_INSTANCE    *MmcHostInstance,
+  OUT EMMC_DEVICE_STATE    *State
+  )
+{
+  EFI_MMC_HOST_PROTOCOL *Host;
+  EFI_STATUS Status;
+  UINT32     Data, RCA;
+
+  if (State == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Host = MmcHostInstance->MmcHost;
+  RCA = MmcHostInstance->CardInfo.RCA << RCA_SHIFT_OFFSET;
+  Status = Host->SendCommand (Host, MMC_CMD13, RCA);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "EmmcGetDeviceState(): Failed to get card status, Status=%r.\n", Status));
+    return Status;
+  }
+  Status = Host->ReceiveResponse (Host, MMC_RESPONSE_TYPE_R1, &Data);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "EmmcGetDeviceState(): Failed to get response of CMD13, Status=%r.\n", Status));
+    return Status;
+  }
+  if (Data & EMMC_SWITCH_ERROR) {
+    DEBUG ((EFI_D_ERROR, "EmmcGetDeviceState(): Failed to switch expected mode, Status=%r.\n", Status));
+    return EFI_DEVICE_ERROR;
+  }
+  *State = DEVICE_STATE(Data);
+  return EFI_SUCCESS;
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+EmmcSetEXTCSD (
+  IN MMC_HOST_INSTANCE     *MmcHostInstance,
+  UINT32                   ExtCmdIndex,
+  UINT32                   Value
+  )
+{
+  EFI_MMC_HOST_PROTOCOL *Host;
+  EMMC_DEVICE_STATE     State;
+  EFI_STATUS Status;
+  UINT32     Argument;
+
+  Host  = MmcHostInstance->MmcHost;
+  Argument = EMMC_CMD6_ARG_ACCESS(3) | EMMC_CMD6_ARG_INDEX(ExtCmdIndex) |
+             EMMC_CMD6_ARG_VALUE(Value) | EMMC_CMD6_ARG_CMD_SET(1);
+  Status = Host->SendCommand (Host, MMC_CMD6, Argument);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "EmmcSetEXTCSD(): Failed to send CMD6, Status=%r.\n", Status));
+    return Status;
+  }
+  // Make sure device exiting prog mode
+  do {
+    Status = EmmcGetDeviceState (MmcHostInstance, &State);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_ERROR, "EmmcSetEXTCSD(): Failed to get device state, Status=%r.\n", Status));
+      return Status;
+    }
+  } while (State == EMMC_PRG_STATE);
+  return EFI_SUCCESS;
+}
+
 STATIC
 EFI_STATUS
 EFIAPI
@@ -38,6 +138,7 @@ EmmcIdentificationMode (
   EFI_MMC_HOST_PROTOCOL *Host;
   EFI_BLOCK_IO_MEDIA    *Media;
   EFI_STATUS Status;
+  EMMC_DEVICE_STATE     State;
   UINT32     RCA;
 
   Host  = MmcHostInstance->MmcHost;
@@ -84,6 +185,22 @@ EmmcIdentificationMode (
     DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): Card selection error, Status=%r.\n", Status));
   }
 
+  if (MMC_HOST_HAS_SETIOS(Host)) {
+    // Set 1-bit bus width
+    Status = Host->SetIos (Host, 0, 1, EMMCBACKWARD);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): Set 1-bit bus width error, Status=%r.\n", Status));
+      return Status;
+    }
+
+    // Set 1-bit bus width for EXTCSD
+    Status = EmmcSetEXTCSD (MmcHostInstance, EXTCSD_BUS_WIDTH, EMMC_BUS_WIDTH_1BIT);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): Set extcsd bus width error, Status=%r.\n", Status));
+      return Status;
+    }
+  }
+
   // Fetch ECSD
   Status = Host->SendCommand (Host, MMC_CMD8, RCA);
   if (EFI_ERROR (Status)) {
@@ -96,6 +213,15 @@ EmmcIdentificationMode (
     return Status;
   }
 
+  // Make sure device exiting data mode
+  do {
+    Status = EmmcGetDeviceState (MmcHostInstance, &State);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): Failed to get device state, Status=%r.\n", Status));
+      return Status;
+    }
+  } while (State == EMMC_DATA_STATE);
+
   // Set up media
   Media->BlockSize = EMMC_CARD_SIZE; // 512-byte support is mandatory for eMMC cards
   Media->MediaId = MmcHostInstance->CardInfo.CIDData.PSN;
@@ -111,6 +237,57 @@ EmmcIdentificationMode (
   return EFI_SUCCESS;
 }
 
+STATIC
+EFI_STATUS
+InitializeEmmcDevice (
+  IN  MMC_HOST_INSTANCE   *MmcHostInstance
+  )
+{
+  EFI_MMC_HOST_PROTOCOL *Host;
+  EFI_STATUS Status = EFI_SUCCESS;
+  ECSD       *ECSDData;
+  UINT32     BusClockFreq, Idx;
+  UINT32     TimingMode[4] = {EMMCHS52DDR1V2, EMMCHS52DDR1V8, EMMCHS52, EMMCHS26};
+
+  Host  = MmcHostInstance->MmcHost;
+  ECSDData = &MmcHostInstance->CardInfo.ECSDData;
+  if (ECSDData->DEVICE_TYPE == EMMCBACKWARD)
+    return EFI_SUCCESS;
+
+  if (!MMC_HOST_HAS_SETIOS(Host)) {
+    return EFI_SUCCESS;
+  }
+  Status = EmmcSetEXTCSD (MmcHostInstance, EXTCSD_HS_TIMING, EMMC_TIMING_HS);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "InitializeEmmcDevice(): Failed to switch high speed mode, Status:%r.\n", Status));
+    return Status;
+  }
+
+  for (Idx = 0; Idx < 4; Idx++) {
+    switch (TimingMode[Idx]) {
+    case EMMCHS52DDR1V2:
+    case EMMCHS52DDR1V8:
+    case EMMCHS52:
+      BusClockFreq = 52000000;
+      break;
+    case EMMCHS26:
+      BusClockFreq = 26000000;
+      break;
+    default:
+      return EFI_UNSUPPORTED;
+    }
+    Status = Host->SetIos (Host, BusClockFreq, 8, TimingMode[Idx]);
+    if (!EFI_ERROR (Status)) {
+      Status = EmmcSetEXTCSD (MmcHostInstance, EXTCSD_BUS_WIDTH, EMMC_BUS_WIDTH_DDR_8BIT);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "InitializeEmmcDevice(): Failed to set EXTCSD bus width, Status:%r\n", Status));
+      }
+      return Status;
+    }
+  }
+  return Status;
+}
+
 STATIC
 EFI_STATUS
 InitializeSdMmcDevice (
@@ -431,9 +608,11 @@ InitializeMmcDevice (
 
   if (MmcHostInstance->CardInfo.CardType != EMMC_CARD) {
     Status = InitializeSdMmcDevice (MmcHostInstance);
-    if (EFI_ERROR (Status)) {
-      return Status;
-    }
+  } else {
+    Status = InitializeEmmcDevice (MmcHostInstance);
+  }
+  if (EFI_ERROR (Status)) {
+    return Status;
   }
 
   // Set Block Length