No UHS support for O2 Micro, Inc. OZ600FJ0/OZ900FJ0/OZ600FJS?

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Hello,

My Dell latitude has an integrated O2 Micro SDHC card reader, listed
by lspci as:
0a:00.0 SD Host controller: O2 Micro, Inc. OZ600FJ0/OZ900FJ0/OZ600FJS
SD/MMC Card Reader Controller (rev 05)

So far I was happily using it with cheap/slow SDHC cards.
However recently I bought a "Samsung SDHC Pro" card which manages to
aequentially write about 45mb/s when I dual-boot Windows7.

The same card caps out on Linux at about ~4-5mb/s:
> dd if=/dev/sda of=/dev/mmcblk0 conv=fsync bs=4M count=256
> 1073741824 bytes (1.1 GB) copied, 258.515 s, 4.2 MB/s

My raspberry pi is able to write to the card at about ~8mb/s.

Any ideas how to debug this issue would be highly appreciated.

Thank you in advance, Clemens
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