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I've done some tests yesterday using the IPU to do YUV to RGB conversion. The IPU part works, I send the YUV data and the correct RGB data comes out, but it's not interleaved.
I write 0x00040024 (transfer 4 qw, skip 0x24 qw) to the D_SQWC register, and start the transfer writing 0x108 to the CHCR (channel-3).

Is the interleave mode only for transfers from/to scratchpad? as the ee-manual says "Interleave mode can perform DMA transfer between main memory and scratchpad memory", or is this meant as an example and I'm missing something else?

...yes, it's only for SP transfers...

I found a solution for the problem. First I transfer the data from IPU to SPR, then interleaved from SPR to main memory; that's still faster than my (not finished) MMI assembler function :)