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[USBOHCI]

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- Wait the required time for the port to be ready after powering it up

svn path=/branches/usb-bringup-trunk/; revision=55196
This commit is contained in:
Cameron Gutman 2012-01-26 04:35:04 +00:00
parent 1cede4f077
commit b4c6fa3b4c
1 changed files with 29 additions and 0 deletions
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29
drivers/usb/usbohci/hardware.cpp
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@ -1266,10 +1266,39 @@ CUSBHardwareDevice::SetPortFeature(
}
else if (Feature == PORT_POWER)
{
LARGE_INTEGER Timeout;
//
// enable power
//
WRITE_REGISTER_ULONG((PULONG)((PUCHAR)m_Base + OHCI_RH_PORT_STATUS(PortId)), OHCI_RH_PORTSTATUS_PPS);
//
// read descriptor A for the delay data
//
Value = READ_REGISTER_ULONG((PULONG)((PUCHAR)m_Base + OHCI_RH_DESCRIPTOR_A_OFFSET));
//
// compute the delay
//
Timeout.QuadPart = OHCI_RH_GET_POWER_ON_TO_POWER_GOOD_TIME(Value);
//
// delay is multiplied by 2 ms
//
Timeout.QuadPart *= 2;
DPRINT1("Waiting %d milliseconds for port power up\n", Timeout.LowPart);
//
// convert to 100 ns units (absolute)
//
Timeout.QuadPart *= -10000;
//
// perform the wait
//
KeDelayExecutionThread(KernelMode, FALSE, &Timeout);
return STATUS_SUCCESS;
}
else if (Feature == PORT_SUSPEND)