imx spi performance

Hi

We are getting a very low throughput with the imx6q and the spi interface :-( I have tried both with gpio CS and HW CS.

With gpio CS:
I have a imx6q hooked up to 4x spi uarts(sc16is750) running 4MHz, using 2 spi channels and 4 chipselects.
With HW flowcontrol @ 115200 8n1, and full duplex on all 4 uarts, we are getting a maximum throughput of 69841 bits/sec. That to me seems very slow.

With HW CS:
It does not seem to work as CS is shifted for every BITS_PER_WORD and that is not compliant with most spi devices.

Does someone have any ideas we can try to boost the performance.

/Sean

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