serial: Make ucc_uart work in HW UART mode
In HW UART mode the TxBD[READY] is not cleared by H/W (RISC engine) when the user send characters to Tx buffer of QE UART. So, these characters stay on the QE forever, never go to UART line. Signed-off-by: NDave Liu <daveliu@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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