[edk2-devel] [[PATCH v2] 1/7] EmbeddedPkg: Fix DwEmmc driver bugs

[Loh, Tien Hock]

From: "Tien Hock, Loh" <tien.hock.loh at 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 at intel.com>
Cc: Leif Lindholm <leif.lindholm at linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
 EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
index adc6b06..fa24802 100644
--- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
+++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
@@ -39,6 +39,7 @@ DWEMMC_IDMAC_DESCRIPTOR   *gpIdmacDesc;
 EFI_GUID mDwEmmcDevicePathGuid = EFI_CALLER_ID_GUID;
 STATIC UINT32 mDwEmmcCommand;
 STATIC UINT32 mDwEmmcArgument;
+STATIC BOOLEAN mIsACmd = FALSE;
 
 EFI_STATUS
 DwEmmcReadBlockData (
@@ -321,6 +322,15 @@ DwEmmcSendCommand (
     Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
            BIT_CMD_SEND_INIT;
     break;
+  case MMC_INDX(6):
+    if(mIsACmd) {
+      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;
@@ -371,6 +381,11 @@ DwEmmcSendCommand (
   }
 
   Cmd |= MMC_GET_INDX(MmcCmd) | BIT_CMD_USE_HOLD_REG | BIT_CMD_START;
+
+  if(MMC_INDX(55) == MMC_GET_INDX(MmcCmd))
+    mIsACmd = TRUE;
+  else
+    mIsACmd = FALSE;
   if (IsPendingReadCommand (Cmd) || IsPendingWriteCommand (Cmd)) {
     mDwEmmcCommand = Cmd;
     mDwEmmcArgument = Argument;
-- 
2.2.2


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