tree b4b0c7dc260387c4b5f7dcf4fea03109c61b071e
parent 54c9ae0f8a5581bf5d3dd1e1e8437860f1dfc1dc
author Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> 1521715843 +0300
committer Jagan Teki <jagan@amarulasolutions.com> 1521739895 +0530

DW SPI: fix tx data loss on FIFO flush

In current implementation if some data still exists in Tx FIFO it
can be silently flushed, i.e. dropped on disabling of the controller,
which happens when writing 0 to DW_SPI_SSIENR (it happens in the
beginning of new transfer)

So add wait for current transmit operation to complete to be sure
that current transmit operation is finished before new one.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>