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MdeModulePkg/UsbBus: reduce the port status polling before port reset 

This change is used to remove the port status polling in port reset
functions.

Why it's needed is because:
1) The same polling on same port has taken place prior to this removed
one. See UsbEnumeratePort()->GetPortStatus(). So this polling in
UsbEnumerateNewDev()->ResetPort() is redundant.
2) EDKII Xhci driver hooks all GetPortStatus() operations. If we don't
remove this one, XHCI driver's XhcPollPortStatusChange() may enter twice
in reset process and wrongly think the device is unplugged.

Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Feng Tian 2016-07-06 10:18:37 +08:00
parent 698554923f
commit bf4808d644
2 changed files with 19 additions and 29 deletions
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16
MdeModulePkg/Bus/Usb/UsbBusDxe/UsbEnumer.c
View File

@ -643,6 +643,7 @@ UsbFindChild (
@param HubIf The HUB that has the device connected.
@param Port The port index of the hub (started with zero).
@param ResetIsNeeded The boolean to control whether skip the reset of the port.
@retval EFI_SUCCESS The device is enumerated (added or removed).
@retval EFI_OUT_OF_RESOURCES Failed to allocate resource for the device.
@ -652,7 +653,8 @@ UsbFindChild (
EFI_STATUS
UsbEnumerateNewDev (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
IN UINT8 Port,
IN BOOLEAN ResetIsNeeded
)
{
USB_BUS *Bus;
@ -677,15 +679,17 @@ UsbEnumerateNewDev (
// and the hub is a EHCI root hub, ResetPort will release
// the device to its companion UHCI and return an error.
//
if (ResetIsNeeded) {
Status = HubApi->ResetPort (HubIf, Port);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to reset port %d - %r\n", Port, Status));
return Status;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: hub port %d is reset\n", Port));
} else {
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: hub port %d reset is skipped\n", Port));
}
Child = UsbCreateDevice (HubIf, Port);
@ -964,7 +968,11 @@ UsbEnumeratePort (
// Now, new device connected, enumerate and configure the device
//
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: new device connected at port %d\n", Port));
Status = UsbEnumerateNewDev (HubIf, Port);
if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_RESET)) {
Status = UsbEnumerateNewDev (HubIf, Port, FALSE);
} else {
Status = UsbEnumerateNewDev (HubIf, Port, TRUE);
}
} else {
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: device disconnected event on port %d\n", Port));

20
MdeModulePkg/Bus/Usb/UsbBusDxe/UsbHub.c
View File

@ -2,7 +2,7 @@
Unified interface for RootHub and Hub.
Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -968,15 +968,6 @@ UsbHubResetPort (
UINTN Index;
EFI_STATUS Status;
Status = UsbHubGetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
return Status;
} else if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_RESET)) {
DEBUG (( EFI_D_INFO, "UsbHubResetPort: skip reset on hub %p port %d\n", HubIf, Port));
return EFI_SUCCESS;
}
Status = UsbHubSetPortFeature (HubIf, Port, (EFI_USB_PORT_FEATURE) USB_HUB_PORT_RESET);
if (EFI_ERROR (Status)) {
@ -1282,15 +1273,6 @@ UsbRootHubResetPort (
//
Bus = RootIf->Device->Bus;
Status = UsbHcGetRootHubPortStatus (Bus, Port, &PortState);
if (EFI_ERROR (Status)) {
return Status;
} else if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_RESET)) {
DEBUG (( EFI_D_INFO, "UsbRootHubResetPort: skip reset on root port %d\n", Port));
return EFI_SUCCESS;
}
Status = UsbHcSetRootHubPortFeature (Bus, Port, EfiUsbPortReset);
if (EFI_ERROR (Status)) {