omap3isp: isp_video_mbus_to_pix causes WARN_ON

[Chris Whittenburg <whittenburg@xxxxxxxxx>]

I'm using a 3.0.17 kernel on a dm3730 with a custom 8-bit grayscale sensor.

When using a simple gstreamer pipeline to test:

gst-launch -v v4l2src device=/dev/video2 !
'video/x-raw-gray,bpp=(int)8,framerate=(fraction)10/1,width=640,height=480'
! fakesink

I get lots of calls to isp_video_try_format for unrelated formats like
YU12, YV12, BGR3, and RGB3.  I assume this is gstreamer's fault, since
I implemented isp_video_enum_format which only returns
V4L2_PIX_FMT_GREY.

Anyway, isp_video_try_format makes calls to isp_video_pix_to_mbus for
each of these formats, and since they aren't in the list of
isp_format_info formats, WARN_ON gets called.

Is this expected?  What would be the best way to resolve it?

Thanks.
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