mmc: stm32: sdmmc2: add hardware flow control support
The hardware flow control functionality is used to avoid FIFO underrun (TX mode) and overrun (RX mode) errors. The behavior is to stop SDMMC_CK during data transfer and freeze the SDMMC state machines. Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>
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