Hello guys, is there anyone dealing with 8976 recently?
I am trying to get IOMMU up on 8976 on mainline, but fails with both upstream and downstream driver.
The upstream driver fails when venus with IOMMU phadle assigned gets probed, ends up with complaining "cannot accommodate DMA translations". 
Downstream driver, on the other hand, threw errors when IOMMU itself gets probed. Saying that cannot set iommu max mapped size....

Here are dt and error logs:

[dt and error logs](https://gist.github.com/FelixWither/864ef52b4508223223acc30fd7dce3e5)