serial: imx: Enable UCR4_OREN in startup interface
Other than enable Receiver Overrun Interrupt Enable (UCR4_OREN) in start_tx interface, UCR4_OREN should be enabled before enable of Receiver. Signed-off-by: Jiada Wang <jiada_wang@mentor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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