By default, MMC is initialized with 1-bit mode and less than 400KHz bus
clock. It causes MMC working inefficiently.

Add the interface to change the bus width and speed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Haojian Zhuang <haojian.zhu...@linaro.org>
---
 EmbeddedPkg/Include/Protocol/MmcHost.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/EmbeddedPkg/Include/Protocol/MmcHost.h 
b/EmbeddedPkg/Include/Protocol/MmcHost.h
index 89f2e80..13e99e7 100644
--- a/EmbeddedPkg/Include/Protocol/MmcHost.h
+++ b/EmbeddedPkg/Include/Protocol/MmcHost.h
@@ -131,6 +131,12 @@ typedef EFI_STATUS (EFIAPI *MMC_WRITEBLOCKDATA) (
   IN  UINT32                    *Buffer
   );
 
+typedef EFI_STATUS (EFIAPI *MMC_SETIOS) (
+  IN  EFI_MMC_HOST_PROTOCOL     *This,
+  IN  UINT32                    BusClockRate,
+  IN  UINT32                    BusWidth
+  );
+
 
 struct _EFI_MMC_HOST_PROTOCOL {
 
@@ -147,6 +153,8 @@ struct _EFI_MMC_HOST_PROTOCOL {
   MMC_READBLOCKDATA       ReadBlockData;
   MMC_WRITEBLOCKDATA      WriteBlockData;
 
+  MMC_SETIOS              SetIos;
+
 };
 
 #define MMC_HOST_PROTOCOL_REVISION    0x00010001    // 1.1
-- 
2.7.4

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