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add comments to clarify the enhancement on EHCI driver, which is guaranteed to get attached to EHCI host controller before UHCI driver attaches to uhci host controller.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9040 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
eric_tian 2009-08-11 05:55:14 +00:00
parent 4888999008
commit ba19956ac3
2 changed files with 27 additions and 3 deletions
MdeModulePkg/Bus/Pci/EhciDxe
Ehci.cEhciDxe.inf

25
MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c

@ -1,7 +1,15 @@
/** @file
/** @file
The Ehci controller driver.
EhciDxe driver is responsible for managing the behavior of EHCI controller.
It implements the interfaces of monitoring the status of all ports and transferring
Control, Bulk, Interrupt and Isochronous requests to Usb2.0 device.
Note that EhciDxe driver is enhanced to guarantee that the EHCI controller get attached
to the EHCI controller before the UHCI driver attaches to the companion UHCI controller.
This way avoids the control transfer on a shared port between EHCI and companion host
controller when UHCI gets attached earlier than EHCI and a USB 2.0 device inserts.
Copyright (c) 2006 - 2009, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@ -1570,6 +1578,9 @@ EhcDriverBindingStart (
goto CLOSE_PCIIO;
}
//
// Get the Pci device class code.
//
Status = PciIo->Pci.Read (
PciIo,
EfiPciIoWidthUint8,
@ -1582,7 +1593,11 @@ EhcDriverBindingStart (
Status = EFI_UNSUPPORTED;
goto CLOSE_PCIIO;
}
//
// determine if the device is UHCI host controller or not. If yes, then find out the
// companion usb ehci host controller and force EHCI driver get attached to it before
// UHCI driver attaches to UHCI host controller.
//
if ((UsbClassCReg.PI == PCI_IF_UHCI) &&
(UsbClassCReg.BaseCode == PCI_CLASS_SERIAL) &&
(UsbClassCReg.SubClassCode == PCI_CLASS_SERIAL_USB)) {
@ -1645,6 +1660,10 @@ EhcDriverBindingStart (
if (EFI_ERROR (Status)) {
goto CLOSE_PCIIO;
}
//
// Currently, the judgment on the companion usb host controller is through the
// same bus number, which may vary on different platform.
//
if (EhciBusNumber == UhciBusNumber) {
gBS->CloseProtocol (
Controller,

5
MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf

@ -6,6 +6,11 @@
# It implements the interfaces of monitoring the status of all ports and transferring
# Control, Bulk, Interrupt and Isochronous requests to Usb2.0 device.
#
# Note that EhciDxe driver is enhanced to guarantee that the EHCI controller get attached
# to the EHCI controller before the UHCI driver attaches to the companion UHCI controller.
# This way avoids the control transfer on a shared port between EHCI and companion host
# controller when UHCI gets attached earlier than EHCI and a USB 2.0 device inserts.
#
# Copyright (c) 2006 - 2009, Intel Corporation.
#
# All rights reserved. This program and the accompanying materials