Openmoko Bug #2274: Kernel regression: white screen of death reappeared with 2.6.29

[Openmoko Public Trac]

#2274: Kernel regression: white screen of death reappeared with 2.6.29
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 Reporter:  CyrusDreams      |          Owner:  openmoko-kernel          
     Type:  defect           |         Status:  new                      
 Priority:  highest          |      Milestone:  stable-kernel-2009.1     
Component:  System Software  |        Version:  GTA02v5                  
 Severity:  critical         |       Keywords:  WSoD white screen suspend
 Haspatch:  0                |      Blockedby:                           
Estimated:                   |    Patchreview:                           
 Blocking:                   |   Reproducible:                           
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Comment(by joerg):

 obviously still not solved
 AIUI "newer" kernels implement complete power down of LCM via power
 regulator (PMU LDO) switchoff.
 On resume it is mandatory for whoever does init of LCM video chip JBT6k74
 to wait for sabilization of VDD power, after LDO is enabled. Alas I don't
 know any good inicator to probe if voltage has stabilized, probably we'll
 need a usleep() of empirically determined duration here (my guess is 100ms
 should be sufficient)

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2274#comment:9>
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