#10106 NORM 1.5-sof: Camera driver v4l2 caps only advertise 30fps

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#10106: Camera driver v4l2 caps only advertise 30fps
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           Reporter:  cjb        |       Owner:  corbet             
               Type:  defect     |      Status:  new                
           Priority:  normal     |   Milestone:  1.5-software-update
          Component:  kernel     |     Version:  not specified      
         Resolution:             |    Keywords:                     
        Next_action:  never set  |    Verified:  0                  
Deployment_affected:             |   Blockedby:                     
           Blocking:             |  
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Comment(by corbet):

 <goes and digs through the gstreamer source for a bit>

 OK, it's using VIDIOC_ENUM_FRAMEINTERVALS.  That was added in 2.6.21, and
 somehow I missed it, so the driver doesn't implement it.  As far as I can
 tell, gstreamer reacts to the missing command by just assuming 30fps and
 won't even try to change the rate.

 I can add the ioctl() with no great trouble; will try to get it done by
 tomorrow.  I don't think I can quite do what's asked for here, though: the
 frame rate is controlled by setting the ov7670 "clock divider" value;
 essentially, you can tell it "use every Nth" clock tick.  So I can get you
 5, 10, 15, and 30fps, but I don't think that anything between 15 and 30 is
 possible.  Will look again to convince myself of that, though.

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Ticket URL: <http://dev.laptop.org/ticket/10106#comment:1>
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