From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 19 Oct 2012 09:47:49 +0000 (+0000)
Subject: EmbeddedPkg/MmcDxe: Ensure MMC is in Identification Mode
X-Git-Tag: edk2-stable201903~12938
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=fc78c48e2094fe9d43aa4a73a4bf4f90d6ecf84b

EmbeddedPkg/MmcDxe: Ensure MMC is in Identification Mode

This change ensure the MMC card is in Identification Mode.
The card might be in Data Transfer Mode if a pre UEFI Boot Loader
had initialized the card.
A potential optimization would be to skip the Identification Mode
in this case.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13872 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
index e335e48c42..72e6d4c6d1 100644
--- a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
@@ -215,13 +215,12 @@ MmcIdentificationMode (
       DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcHwInitializationState\n"));
       return Status;
     }
-  } else {
-    //Note: Could even be used in all cases. But it looks this command could put the state machine into inactive for some cards
-    Status = MmcHost->SendCommand (MmcHost, MMC_CMD0, 0);
-    if (EFI_ERROR(Status)) {
-      DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD0): Error\n"));
-      return Status;
-    }
+  }
+
+  Status = MmcHost->SendCommand (MmcHost, MMC_CMD0, 0);
+  if (EFI_ERROR(Status)) {
+    DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD0): Error\n"));
+    return Status;
   }
 
   Status = MmcNotifyState (MmcHostInstance, MmcIdleState);