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From 8d5bd220aee4a0b6e4c1dc9b3b54fe1b30c30e32 Mon Sep 17 00:00:00 2001
From: Olivier Deprez <o-deprez@ti.com>
Date: Mon, 25 Jun 2012 11:06:31 +0200
Subject: [PATCH] fixes sd card identification on panda
It is observed with few SD cards that the protocol is hanging after issuing cmd5 and before cmd8.
Adding a small delay inbetween recovers and driver bring up is continuing without problem.
---
EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
index 47f4aeb..f8d2cc4 100644
--- a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
@@ -229,6 +229,12 @@ MmcIdentificationMode (
// Are we using SDIO ?
Status = MmcHost->SendCommand (MmcHost, MMC_CMD5, 0);
+
+#if 1 // Added for Panda Board
+ /* It seems few SD cards need some time to recover from this command? */
+ MicroSecondDelay(1000);
+#endif
+
if (Status == EFI_SUCCESS) {
DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD5): Error - SDIO not supported.\n"));
return EFI_UNSUPPORTED;
--
1.7.4.1
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