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[USBEHCI]

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- Wait 20 milliseconds for port reset

svn path=/branches/usb-bringup-trunk/; revision=55366
This commit is contained in:
Cameron Gutman 2012-02-01 11:49:57 +00:00
parent 6c5ad5e239
commit 33c1f6019d
1 changed files with 16 additions and 1 deletions
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17
drivers/usb/usbehci_new/hardware.cpp
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@ -735,6 +735,7 @@ CUSBHardwareDevice::ResetPort(
IN ULONG PortIndex)
{
ULONG PortStatus;
LARGE_INTEGER Timeout;
if (PortIndex > m_Capabilities.HCSParams.PortCount)
return STATUS_UNSUCCESSFUL;
@ -759,7 +760,21 @@ CUSBHardwareDevice::ResetPort(
PortStatus &= ~EHCI_PRT_ENABLED;
EHCI_WRITE_REGISTER_ULONG(EHCI_PORTSC + (4 * PortIndex), PortStatus);
KeStallExecutionProcessor(100);
//
// delay is 20 ms for port reset as per USB 2.0 spec
//
Timeout.QuadPart = 20;
DPRINT1("Waiting %d milliseconds for port reset\n", Timeout.LowPart);
//
// convert to 100 ns units (absolute)
//
Timeout.QuadPart *= -10000;
//
// perform the wait
//
KeDelayExecutionThread(KernelMode, FALSE, &Timeout);
//
// Clear reset