From 589d51df260465e2561979b8a988e77b0f32a6e8 Mon Sep 17 00:00:00 2001
From: Sean Rhodes <sean@starlabs.systems>
Date: Thu, 24 Feb 2022 19:38:18 +0800
Subject: [PATCH] MdeModulePkg/Usb/Keyboard.c: Don't request protocol before
 setting

No need to check the interface protocol then conditionally setting,
just set it to BOOT_PROTOCOL and check for error.

This is what Linux does for HID devices as some don't follow the USB spec.
One example is the Aspeed BMC HID keyboard device, which adds a massive
boot delay without this patch as it doesn't respond to
'GetProtocolRequest'.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
---
 MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c b/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c
index 5a94a4dda7..b5a6459a35 100644
--- a/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c
+++ b/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c
@@ -805,7 +805,6 @@ InitUSBKeyboard (
   )
 {
   UINT16      ConfigValue;
-  UINT8       Protocol;
   EFI_STATUS  Status;
   UINT32      TransferResult;
 
@@ -854,22 +853,15 @@ InitUSBKeyboard (
     }
   }
 
-  UsbGetProtocolRequest (
-    UsbKeyboardDevice->UsbIo,
-    UsbKeyboardDevice->InterfaceDescriptor.InterfaceNumber,
-    &Protocol
-    );
   //
   // Set boot protocol for the USB Keyboard.
   // This driver only supports boot protocol.
   //
-  if (Protocol != BOOT_PROTOCOL) {
-    UsbSetProtocolRequest (
-      UsbKeyboardDevice->UsbIo,
-      UsbKeyboardDevice->InterfaceDescriptor.InterfaceNumber,
-      BOOT_PROTOCOL
-      );
-  }
+  UsbSetProtocolRequest (
+    UsbKeyboardDevice->UsbIo,
+    UsbKeyboardDevice->InterfaceDescriptor.InterfaceNumber,
+    BOOT_PROTOCOL
+    );
 
   UsbKeyboardDevice->CtrlOn    = FALSE;
   UsbKeyboardDevice->AltOn     = FALSE;