Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Allwinner/D1H/SMHC[2]/SMHC_CTYPE#0x0
CARD_WID=b1
Bus Width Register
Card Width
0 (b1): 1-bit width
1 (b4): 4-bit width
2 (b8): 8-bit width
https://github.com/cmsis-svd/cmsis-svd-data