Openmoko Bug #1841: white screen of death (WSOD) after resume

[Openmoko Public Trac]

#1841: white screen of death (WSOD) after resume
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    Reporter:  Rorschach    |        Owner:  openmoko-devel
        Type:  defect       |       Status:  new           
    Priority:  highest      |    Milestone:                
   Component:  unknown      |      Version:  GTA02v5       
    Severity:  critical     |   Resolution:                
    Keywords:  wsod,resume  |     Haspatch:  0             
   Blockedby:               |    Estimated:                
 Patchreview:               |     Blocking:                
Reproducible:  always       |  
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Comment(by nicolas.dufresne):

 I've seen the hard reset that has been added in the jbt driver in stable-
 tracking so I've tested it. I've got the same problem too, but I've tested
 only once and did not try to sleep it again to see if reset help
 recovering (I will try to find time later to do this test).

 I've been reading the jbt driver source code today. I have a feeling that
 locking is too weak. I think it only protects the registry cache.This
 makes me think there is a larger problem. As the resume process implies
 multiple reg_write (and the locking is done inside this function) it means
 that registry could be written during a suspend or resume sequence or
 registry write, which I don't think it is a good idea. But I might also be
 totally wrong.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/1841#comment:65>
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