[TF-A] Regression on Poplar eMMC

Hi Tien,

We recently found a regression on Poplar eMMC in U-Boot, which seems caused by commit 3d0f30bb544a ("drivers: synopsys: Fix synopsys MMC driver"). For some reason, the setup of FIFO threshold breaks eMMC support in U-Boot [1]. Would you please suggest a sensible fix for this regression? Thanks.

Shawn

[1] https://discuss.96boards.org/t/uboot-mmc-init-problem/8130/3