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[USBEHCI]

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- Wait 20 milliseconds after enabling power for the port to stabilize

svn path=/branches/usb-bringup-trunk/; revision=55365
This commit is contained in:
Cameron Gutman 2012-02-01 11:22:43 +00:00
parent 205e63a314
commit 6c5ad5e239
1 changed files with 20 additions and 1 deletions
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21
drivers/usb/usbehci_new/hardware.cpp
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@ -957,11 +957,30 @@ CUSBHardwareDevice::SetPortFeature(
{
if (m_Capabilities.HCSParams.PortPowerControl)
{
ULONG Value;
LARGE_INTEGER Timeout;
//
// enable port power
//
ULONG Value = EHCI_READ_REGISTER_ULONG(EHCI_PORTSC + (4 * PortId)) | EHCI_PRT_POWER;
Value = EHCI_READ_REGISTER_ULONG(EHCI_PORTSC + (4 * PortId)) | EHCI_PRT_POWER;
EHCI_WRITE_REGISTER_ULONG(EHCI_PORTSC, Value);
//
// delay is 20 ms
//
Timeout.QuadPart = 20;
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;