Hi, On 16.06.21 at 08:18, Jiri Slaby wrote: mdelay(port->rs485.delay_rts_before_send); > > This is up to 1 second delay with interrupts disabled. Definitely not nice. 8250 clamps this to 100 ms at least, why did you choose 1000 ms? > AFAICS the 8250 driver does not clamp values read from the device tree property "rs485-rts-delay" (set by uart_get_rs485_mode()). Is this on purpose? Regards, Lino
