Re: non-standard baud rates with Prolific 2303 USB-serial

[Johan Hovold <johan@kernel.org>]

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On Mon, Feb 22, 2021 at 10:42:25AM -0500, Michael G. Katzmann wrote:
> Sorry, my mistake .. when I put it in the right order it does indeed
> also give 110Bd !

Heh, thanks for verifying that. So two ways of encoding the divisors
then. :)

> On 2/22/21 10:34 AM, Johan Hovold wrote:
> > On Mon, Feb 22, 2021 at 09:53:39AM -0500, Michael G. Katzmann wrote:
> >> On 2/22/21 8:18 AM, Johan Hovold wrote:
> >>
> >> I tried hardcoding buf[6-0] in pl2303_set_termios as
> >>
> >> a8 a6 01 80 00 02 07 and got a bitrate of ~200kb 
> >>
> >> so, no these settings do not work in my case (or I missunderstood your
> >> instructions 8-))
> > Thanks for testing (and that was with 0xa8 in byte 0, right?)
> >
> > So it seems we have three devices with bcdDevice 0x0300 encoding the
> > divisors in slightly different ways and that are all still supported by
> > the vendor's Windows driver.
> >
> > Unless Prolific are willing to shed some light on this, I guess someone
> > needs to try to figure out how the Windows driver determines which
> > encoding to use.
> >
> > Is your device supposedly also a PL2303 TA? Could you post the output of
> > lsusb -v for completeness?

Was your device also a TA?

Johan