#11224 NORM 1.75-ha: XO-1.75 CPU thermal protection by frequency reduction or alternate mechanism

[Zarro Boogs per Child]

#11224: XO-1.75 CPU thermal protection by frequency reduction or alternate
mechanism
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           Reporter:  Quozl                |       Owner:  wmb at firmworks.com   
               Type:  enhancement          |      Status:  new                 
           Priority:  normal               |   Milestone:  1.75-hardware       
          Component:  ofw - open firmware  |     Version:  Development firmware
         Resolution:                       |    Keywords:                      
        Next_action:  design               |    Verified:  0                   
Deployment_affected:                       |   Blockedby:                      
           Blocking:                       |  
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Comment(by wad):

 This is a "contractual requirement" by Quanta quality assurance.

 Normally, it is provided by a hardware circuit in the PMIC, and it forces
 the processor to periodically enter C3/C4 state to reduce the die
 temperature.

 Mars did mention that a minimum interpretation of the QA requirement would
 be to shut the laptop down upon exceeding a certain SoC die temperature.
 This would be simpler than trying to modulate the operating frequency
 under software control.

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Ticket URL: <http://dev.laptop.org/ticket/11224#comment:1>
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