Check these Marcus Overhagen reports from 2015:
Here is Marcus response:
"Ulf Hansson suggested to experiment with changing MMC_CAPS, but I ran
into trouble when trying to install custom kernel image because my
/boot partition was too small.
I didn't get any futher response from other developers. Apart from
Ulf, nobody seemed to be bothered by the corruption."
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rtsx_usb module for Realtek Semiconductor Corp. RTS5129 Card Reader
Controller: mmc errors and read data corruption
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