Hi,
I don't think it's a clock issue.
I'm supposing that the camera is generating the color bar, correct?
Could you please send me the gst command line you're using to make this test?
Are you already able to receive some image? Or just the color bar?
Has the color bar picture you're receiving the correct resolution you expect?
To narrow down the problem, could you please test the camera using the video overlay unit test?
It's located on your rootfs at /unit_tests/mxc_v4l2_overlay.out.
Let me know about the results.
/Alejandro