[edk2-platforms][Patch 1/3] CoffeelakeSiliconPkg/BaseSmbusLib: Fix SmBusSendByte value

["Michael D Kinney" <michael.d.kinney@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3450

Update SmBusSendByte() to write value to Command Register instead of
Host Data registers.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
 .../Pch/Library/BaseSmbusLib/BaseSmbusLib.c   | 24 +++++++++++++------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/Silicon/Intel/CoffeelakeSiliconPkg/Pch/Library/BaseSmbusLib/BaseSmbusLib.c b/Silicon/Intel/CoffeelakeSiliconPkg/Pch/Library/BaseSmbusLib/BaseSmbusLib.c
index 3d6386d433..dacf9d03b2 100644
--- a/Silicon/Intel/CoffeelakeSiliconPkg/Pch/Library/BaseSmbusLib/BaseSmbusLib.c
+++ b/Silicon/Intel/CoffeelakeSiliconPkg/Pch/Library/BaseSmbusLib/BaseSmbusLib.c
@@ -203,14 +203,24 @@ InternalSmBusNonBlock (
     AuxiliaryControl |= B_SMBUS_IO_AAC;
   }
   //
-  // Set Host Commond Register.
+  // We do not need Data Register for SendByte Command
   //
-  IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HCMD, (UINT8) SMBUS_LIB_COMMAND (SmBusAddress));
-  //
-  // Write value to Host Data 0 and Host Data 1 Registers.
-  //
-  IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HD0, (UINT8) Value);
-  IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HD1, (UINT8) (Value >> 8));
+  if ((HostControl == V_SMBUS_IO_SMB_CMD_BYTE) && ((SmBusAddress & BIT0) == B_SMBUS_IO_WRITE)) {
+    //
+    // Set Host Command Register.
+    //
+    IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HCMD, (UINT8)Value);
+  } else {
+    //
+    // Set Host Command Register.
+    //
+    IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HCMD, (UINT8) SMBUS_LIB_COMMAND (SmBusAddress));
+    //
+    // Write value to Host Data 0 and Host Data 1 Registers.
+    //
+    IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HD0, (UINT8) Value);
+    IoWrite8 (IoPortBaseAddress + R_SMBUS_IO_HD1, (UINT8) (Value >> 8));
+  }
   //
   // Set Auxiliary Control Regiester.
   //
-- 
2.31.1.windows.1