#10208 NORM 1.0-sof: disable wifi stopped working on XO-1

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#10208: disable wifi stopped working on XO-1
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           Reporter:  dsd     |       Owner:  dsaxena            
               Type:  defect  |      Status:  new                
           Priority:  normal  |   Milestone:  1.0-software-update
          Component:  kernel  |     Version:  not specified      
         Resolution:          |    Keywords:                     
        Next_action:  code    |    Verified:  0                  
Deployment_affected:          |   Blockedby:                     
           Blocking:          |  
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Comment(by pgf):

 hmm.  not so fast.

 on XO-1, the interface we use for disabling wireless isn't really an
 enable/disable mechanism.  it's more of a "reset and release" vs. "reset
 and hold in reset".  i.e., there's no way to force the wlan out of reset
 without _causing_ a reset.

 the result is that if we implement rfkill on top of this, then two "rfkill
 unblock wifi" commands in a row will cause a wlan reset.  we could keep a
 state variable, but since there's another path to the wlan reset
 capability via /sys/power/wlan-enabled, that get's complicated, and
 possibly error-prone.  if there were an EC command called
 "EC_WLAN_FETCH_RESET_STATE" we could use that to avoid a second reset, but
 there isn't.

 ideas?  most of the time this won't be an issue.  what's at stake is
 implementing what looks like an rfkill interface which isn't really
 correct.

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Ticket URL: <http://dev.laptop.org/ticket/10208#comment:2>
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