Best I can get is 4 bit width. Looks like MMC_CAP_BUS_WIDTH_TEST is not set and then mmc_compare_ext_csds() fails.
This is on a T4240 running Linux 3.14.
Check the rtsx_pci_sdmmc.c file this file contains the MMC_CAP_BUS_WIDTH_TEST setting.
Have a great day,
Pavel
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