[PATCH 1/1] EmbeddedPkg: Add SD command support for DwEmmc

["Loh, Tien Hock" <tien.hock.loh@intel.com>]

From: "TIen Hock, Loh" <tien.hock.loh@intel.com>

Added ACMD6 for SD support. For SD, after CMD55 is sent, the next
command should be an application command, which should not expect
data

Signed-off-by: "Tien Hock, Loh" <tien.hock.loh@intel.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>

--
v2:
- Move IsACmd as a local static variable in function
- Fix some coding standard issue with spacing
---
 EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
index 68c523a99f..420487757d 100644
--- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
+++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
@@ -307,6 +307,7 @@ DwEmmcSendCommand (
 {
   UINT32       Cmd = 0;
   EFI_STATUS   Status = EFI_SUCCESS;
+  STATIC BOOLEAN IsACmd = FALSE;
 
   switch (MMC_GET_INDX(MmcCmd)) {
   case MMC_INDX(0):
@@ -323,6 +324,15 @@ DwEmmcSendCommand (
     Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
            BIT_CMD_SEND_INIT;
     break;
+  case MMC_INDX (6):
+    if(IsACmd) {
+      Cmd = BIT_CMD_RESPONSE_EXPECT;
+    }
+    else {
+      Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_DATA_EXPECTED |
+            BIT_CMD_READ;
+    }
+    break;
   case MMC_INDX(7):
     if (Argument)
         Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC;
@@ -367,12 +377,22 @@ DwEmmcSendCommand (
     Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
            BIT_CMD_DATA_EXPECTED;
     break;
+  case MMC_INDX (51):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_DATA_EXPECTED |
+           BIT_CMD_READ | BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
   default:
     Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC;
     break;
   }
 
   Cmd |= MMC_GET_INDX(MmcCmd) | BIT_CMD_USE_HOLD_REG | BIT_CMD_START;
+
+  if(MMC_INDX (55) == MMC_GET_INDX (MmcCmd))
+    IsACmd = TRUE;
+  else
+    IsACmd = FALSE;
+
   if (IsPendingReadCommand (Cmd) || IsPendingWriteCommand (Cmd)) {
     mDwEmmcCommand = Cmd;
     mDwEmmcArgument = Argument;
-- 
2.19.0