#12101 BLOC 4-softw: cl4: touchpad missing after reboot

Zarro Boogs per Child bugtracker at laptop.org
Tue Feb 12 14:50:23 EST 2013

#12101: cl4: touchpad missing after reboot
           Reporter:  pgf        |       Owner:                                    
               Type:  defect     |      Status:  new                               
           Priority:  blocker    |   Milestone:  4-software                        
          Component:  kernel     |     Version:  Development source as of this date
         Resolution:             |    Keywords:  XO-4, touchpad                    
        Next_action:  reproduce  |    Verified:  0                                 
Deployment_affected:             |   Blockedby:                                    
           Blocking:             |  

Comment(by dsd):

 In the above trace, we attempt to submit command 0x33 to the device. The
 SP drives the clock line low, and programs a timer interrupt to arrive
 about 110uS later.

 The timer interrupt arrives, the SP drives data low and clock high. This
 is all in accordance with my reading of PS2 specs.

 The relevant GPIO is then configured to generate interrupts upon the
 clock's falling edge. But we do not receive any interrupts at this point.
 Given that the device should always be generating the clock signal, and
 the host has it unhibited at this point, it seems strange that this is
 failing here; I would have thought that listening for the clock signal
 would be reliable/trivial.

Ticket URL: <http://dev.laptop.org/ticket/12101#comment:19>
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