#9390 NORM 1.5-BTe: custom PCI subproduct ID for HDA chip

[Zarro Boogs per Child]

#9390: custom PCI subproduct ID for HDA chip
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           Reporter:  dsd        |       Owner:  wad      
               Type:  defect     |      Status:  new      
           Priority:  normal     |   Milestone:  1.5-BTest
          Component:  hardware   |     Version:  1.5-A1   
         Resolution:             |    Keywords:           
        Next_action:  never set  |    Verified:  0        
Deployment_affected:             |   Blockedby:           
           Blocking:             |  
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Comment(by gnu):

 In reading the generic Intel HDA codec spec, and comparing it to the
 http://dev.laptop.org/~dsd/20090629/codec0.txt, it seems that the
 "Configuration Default" registers aren't being set up properly by OFW.
 These registers define the physical location, color, and type of device
 connected by motherboard wiring to each pin on the codec.  E.g. "Internal
 Mic Inside Lid" versus "External Green Headphone Output 1/8" Jack on Left
 side".  It's also easy to specify "Not Connected" here.  Normally these
 would be set at power-on by the BIOS, and then read by the software in
 order to properly label the various audio controls.  This design avoids
 needing separate software driver mods (kernel "quirks") for every single
 model of motherboard or laptop.
 (These register contents are not retained over a full codec power-down, so
 the kernel would probably want to save a copy from boot time.)

 If these registers are set in a way that the generic kernel code knows (or
 can be taught) how to interpret them correctly, then no code custom to
 OLPC will be needed in the HDA drivers, which would be a blessing.

 (copied from a longer email to devel on 3 July 2009 by John Gilmore)

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Ticket URL: <http://dev.laptop.org/ticket/9390#comment:3>
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