#11529 HIGH 1.75-so: EC SSP reports TX underrun with 11.3.1 os18 runin

[Zarro Boogs per Child]

#11529: EC SSP reports TX underrun with 11.3.1 os18 runin
-------------------------------------+--------------------------------------
           Reporter:  greenfeld      |       Owner:  dilinger                         
               Type:  defect         |      Status:  new                              
           Priority:  high           |   Milestone:  1.75-software                    
          Component:  kernel         |     Version:  Development build as of this date
         Resolution:                 |    Keywords:                                   
        Next_action:  test in build  |    Verified:  0                                
Deployment_affected:                 |   Blockedby:                                   
           Blocking:                 |  
-------------------------------------+--------------------------------------

Comment(by pgf):

 on a fresh install of os20, i'm getting the following:

 on the EC:
 {{{
 882584:SDI switchwait noack
 882585:CMD Switch
 885587:SDI switchwait noack
 885588:CMD Switch
 888590:SDI switchwait noack
 888592:CMD Switch
 891593:SDI switchwait noack
 891594:CMD Switch
 894596:SDI switchwait noack
 894598:CMD Switch
 897599:SDI switchwait noack
 897600:CMD Switch
 900602:SDI switchwait noack
 900604:CMD Switch
 }}}
 and on the host:

 {{{
 [  974.809707] olpc-ec-1.75: SSP reports TX underrun
 [  975.188468] olpc-ec-1.75: EC protocol error: timeout waiting for SWITCH
 [  975.200538] power_supply olpc-ac: driver failed to report `online'
 property
 [  977.833943] olpc-ec-1.75: SSP reports TX underrun
 [  980.858551] olpc-ec-1.75: SSP reports TX underrun
 [  983.882630] olpc-ec-1.75: SSP reports TX underrun
 [  985.198471] olpc-ec-1.75: EC protocol error: timeout waiting for SWITCH
 [  985.210456] power_supply olpc-battery: driver failed to report `status'
 property
 [  986.906982] olpc-ec-1.75: SSP reports TX underrun
 [  989.931433] olpc-ec-1.75: SSP reports TX underrun
 [  992.955174] olpc-ec-1.75: SSP reports TX underrun
 [  995.208471] olpc-ec-1.75: EC protocol error: timeout waiting for SWITCH
 [  995.220428] power_supply olpc-battery: driver failed to report
 `present' property
 [  995.980051] olpc-ec-1.75: SSP reports TX underrun
 [  999.004056] olpc-ec-1.75: SSP reports TX underrun
 [ 1002.028732] olpc-ec-1.75: SSP reports TX underrun
 [ 1005.052688] olpc-ec-1.75: SSP reports TX underrun
 [ 1005.228488] olpc-ec-1.75: EC protocol error: timeout waiting for SWITCH
 [ 1005.240379] power_supply olpc-ac: driver failed to report `online'
 property
 [ 1008.077250] olpc-ec-1.75: SSP reports TX underrun
 }}}

-- 
Ticket URL: <http://dev.laptop.org/ticket/11529#comment:5>
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