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, _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
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