mmc: dw_mmc: Clear the DDR mode for non-DDR
UHS_REG should be cleared for non-DDR mode. But currently there is no way to clear DDR mode, if it is already set once. This patch adds clearing DDR mode for non-DDR mode. Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com> Acked-by: NWill Newton <will.newton@imgtec.com> Signed-off-by: NChris Ball <cjb@laptop.org>
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