Revision 01 works.

Revision 02 works.

lspci

08:05.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 02)

lspci -v

08:05.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 02) (prog-if 01)
	Subsystem: Dell Device 0273
	Flags: bus master, slow devsel, latency 32, IRQ 22
	Memory at f8002800 (32-bit, non-prefetchable) [size=256]
	Capabilities: [a0] Power Management version 2
	Kernel driver in use: sdhci-pci
	Kernel modules: sdhci-pci

lspci -nnpk

08:05.2 SD Host controller [0805]: O2 Micro, Inc. Integrated MMC/SD Controller [1217:7120] (rev 02)

lspci -vmmnn

Slot:	0b:06.2
Class:	SD Host controller [0805]
Vendor:	O2 Micro, Inc. [1217]
Device:	Integrated MMC/SD Controller [7120]
SVendor:	Acer Incorporated [ALI] [1025]
SDevice:	Device [0124]
Rev:	02
ProgIf:	01

lspci -nnk

0b:06.2 SD Host controller [0805]: O2 Micro, Inc. Integrated MMC/SD Controller [1217:7120] (rev 02)
	Subsystem: Acer Incorporated [ALI] Device [1025:0124]
	Kernel driver in use: sdhci-pci
	Kernel modules: sdhci-pci