From f9c2c71ed69ca1d92687a55d3ef947cfb4413b3e Mon Sep 17 00:00:00 2001 From: MrChromebox Date: Mon, 6 Jan 2020 12:12:05 +0800 Subject: [PATCH] MdeModulePkg/Usb/EfiKey: Fix endpoint selection The endpoint selected by the driver needs to not only be an interrupt type, but have direction IN as required to set up an asynchronous interrupt transfer. Currently, the driver assumes that the first INT endpoint will be of type IN, but that is not true of all devices, and will silently fail on devices which have the OUT endpoint before the IN. Adjust the endpoint selection loop to explictly check for direction IN. Test: detachable keyboard on Google Pixel Slate now works. Signed-off-by: Matt DeVillier Reviewed-by: GuoMinJ Reviewed-by: Hao A Wu --- MdeModulePkg/Bus/Usb/UsbKbDxe/EfiKey.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/MdeModulePkg/Bus/Usb/UsbKbDxe/EfiKey.c b/MdeModulePkg/Bus/Usb/UsbKbDxe/EfiKey.c index 27685995c2..ccb389067a 100644 --- a/MdeModulePkg/Bus/Usb/UsbKbDxe/EfiKey.c +++ b/MdeModulePkg/Bus/Usb/UsbKbDxe/EfiKey.c @@ -215,7 +215,7 @@ USBKeyboardDriverBindingStart ( EndpointNumber = UsbKeyboardDevice->InterfaceDescriptor.NumEndpoints; // - // Traverse endpoints to find interrupt endpoint + // Traverse endpoints to find interrupt endpoint IN // Found = FALSE; for (Index = 0; Index < EndpointNumber; Index++) { @@ -226,7 +226,8 @@ USBKeyboardDriverBindingStart ( &EndpointDescriptor ); - if ((EndpointDescriptor.Attributes & (BIT0 | BIT1)) == USB_ENDPOINT_INTERRUPT) { + if (((EndpointDescriptor.Attributes & (BIT0 | BIT1)) == USB_ENDPOINT_INTERRUPT) && + ((EndpointDescriptor.EndpointAddress & USB_ENDPOINT_DIR_IN) != 0)) { // // We only care interrupt endpoint here //