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From: "Sean Rhodes" <sean@starlabs.systems>
To: devel@edk2.groups.io
Cc: guo.dong@intel.com, Sean Rhodes <sean@starlabs.systems>,
	Hao A Wu <hao.a.wu@intel.com>, Ray Ni <ray.ni@intel.com>,
	Matt DeVillier <matt.devillier@gmail.com>,
	Patrick Rudolph <patrick.rudolph@9elements.com>
Subject: [PATCH] MdeModulePkg/Usb/Keyboard.c: Don't request protocol before setting
Date: Thu, 24 Feb 2022 11:38:18 +0000	[thread overview]
Message-ID: <96aee2ccd71e956372fa85cfafbf4fa03da3ae1f.1645702698.git.sean@starlabs.systems> (raw)

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>
---
 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;
-- 
2.32.0


             reply	other threads:[~2022-02-24 11:38 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-24 11:38 Sean Rhodes [this message]
2022-03-02  2:10 ` [PATCH] MdeModulePkg/Usb/Keyboard.c: Don't request protocol before setting Wu, Hao A
2022-03-03  6:27   ` [edk2-devel] " Wu, Hao A
  -- strict thread matches above, loose matches on Subject: below --
2022-02-24  8:04 Sean Rhodes
2022-02-18  7:29 Sean Rhodes
2022-02-24  2:44 ` Wu, Hao A

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