[cgutman] 55366: [USBEHCI] - Wait 20 milliseconds for port reset

Author: cgutman
Date: Wed Feb  1 11:49:57 2012
New Revision: 55366

URL: http://svn.reactos.org/svn/reactos?rev=55366&view=rev
Log:
[USBEHCI]
- Wait 20 milliseconds for port reset

Modified:
    branches/usb-bringup-trunk/drivers/usb/usbehci_new/hardware.cpp

Modified: branches/usb-bringup-trunk/drivers/usb/usbehci_new/hardware.cpp
URL: http://svn.reactos.org/svn/reactos/branches/usb-bringup-trunk/drivers/usb/us...
==============================================================================
--- branches/usb-bringup-trunk/drivers/usb/usbehci_new/hardware.cpp [iso-8859-1] (original)
+++ branches/usb-bringup-trunk/drivers/usb/usbehci_new/hardware.cpp [iso-8859-1] Wed Feb  1 11:49:57 2012
@@ -735,6 +735,7 @@
     IN ULONG PortIndex)
 {
     ULONG PortStatus;
+    LARGE_INTEGER Timeout;

if (PortIndex > m_Capabilities.HCSParams.PortCount)
         return STATUS_UNSUCCESSFUL;
@@ -759,7 +760,21 @@
     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