On Fri, Feb 19, 2016 at 01:55:34PM +0300, Matwey V. Kornilov wrote: > Dear Bill and all, > > I am facing an issue with ftdi_sio module and FTDI FT232-based > devices. Now I am trying to understand where the origin is. > By indirect evidences, I think that there is a small time gap between > return of tcsetattr(fd_, TCSANOW, &new_termios) and actual settings > application in the hardware. From the kernel sources I see that > tcsetattr returns after ftdi_set_termios complete, which uses sync > usb_control_msg calls. > Unfortunately, I've not found data-sheet for FT232 describing USB > protocol, so I would like to ask whether it is guaranteed that new > settings are applied in hardware before ftdi_set_termios returns? I'd assume so, but that's a question better posed to FTDI. Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
