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omap serial driver add rs485 function

Hi TI

my github: github.com/.../omap_serial_add_rs485_flag

I have implement omap_serial.c that has function of RS485 mode, when I type any keyboard, then RTS is pull high immediately, and when I stop this action, then RTS is pull low automatically .  I test it in baud rate 9600, the message can be transmit without noise. But when I test it in baud rate 115200, every data is noise, because TX wave is not entirely in section of RTS which is pull high.  Below is in condition of baud rate 9600

Below is in condition in 115200

Below is demo in baud rate 115200

How can I revise to TX wave which is covered by RTS entirely?  Thank you.