* imx spi performance
@ 2016-03-09 8:26 Sean Nyekjær
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From: Sean Nyekjær @ 2016-03-09 8:26 UTC (permalink / raw)
To: linux-spi-u79uwXL29TY76Z2rM5mHXA; +Cc: kibo-rjjw5hvvQKZaa/9Udqfwiw
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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