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When register Rcvr_timeout_reg0 (R_RTOR in cadence_uart.c) is set to 0, the receiver timeout counter should be disabled. See page 1801 of "Zynq-7000 AP SoC Technical Reference Manual". This commit adds a such a check before setting the receive timeout interrupt. Signed-off-by: Andrew Gacek <andrew.gacek@gmail.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>