@Pepto, you've gone through all the trouble of posting screenshots of your IOReg but for the wrong device! Can you please confirm that your SD card reader is indeed under RP06. Reboot with your E6320 DSDT then check the PCI ids listed under RP06->PXSX device. Expect vendor 1217 and device 8321.
If, as expected it's indeed RP06->PXSX, use the attached revised DSDT. It's got:
* DTGP method added
* RP06.PXSX renamed to RP06.SDXC (i.e. same device name as Apple's)
* required DSM method injected into RP06.SDXC
I will give it a try