#9423 NORM 1.5-fir: Stabilize OFW USB handling on XO-1.5

[Zarro Boogs per Child]

#9423: Stabilize OFW USB handling on XO-1.5
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           Reporter:  wmb at firmworks.com    |       Owner:  wmb at firmworks.com
               Type:  defect               |      Status:  closed           
           Priority:  normal               |   Milestone:  1.5-firmware     
          Component:  ofw - open firmware  |     Version:  1.5-B2           
         Resolution:  fixed                |    Keywords:                   
        Next_action:  test in release      |    Verified:  0                
Deployment_affected:                       |   Blockedby:                   
           Blocking:                       |  
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Comment(by wmb at firmworks.com):

 Additional information describing a similar failure:

 If the initial delay is set to 0, so that polling begins immediately after
 attaching a new queue head to the async list, other types of transactions
 often fail.  Specifically, the "get descriptor" transactions on the
 control pipe, which are done during device probing, often fail, so that
 the driver cannot identify the devices.

 This initial failure only happens when the EHCI Sleep Timeout (D16F4
 Rx4b[6:5]) is set to "11".  When that field is set to "00", the initial
 failures do not occur, even with initial delay = 0.

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Ticket URL: <http://dev.laptop.org/ticket/9423#comment:13>
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