UHS card problem

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I have a 3.0 host controller on a board that only does 3.3V. The
capabilities registers don't specify support for any UHS modes and
also don't show support for 1.8V. When I insert a UHS card the driver
tries to switch to 1.8V and fails to init the card. I was hoping I
could set the CAP registers so that the UHS card would just be run at
HS/3.3V but I don't see a good way to do this in the current driver.
Is this a driver issue or is there a capabilities setting that I'm
missing?

Thanks
Al Cooper
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