ARM: meson: serial: use meson_uart_tx_empty() to wait for empty
Use the meson_uart_tx_empty() instead of a direct read of the status register. This is easier to read and will ensure the UART's transmit state machine is idle when trying to update the baud rate. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Tested-by: Carlo Caione <carlo@endlessm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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