On Tue, Sep 25, 2012 at 04:57:43PM +0400, Andrew wrote: > Uwe Bonnes писал 25.09.2012 12:46: > >>>>>>"Andrew" == Andrew <andrew@xxxxxxxxxx> writes: > > > > Andrew> This is seen on widely used ftdi ft232rl chips. > >Setting the > > Andrew> parity to something like 'even' results in occasional > >framing > > Andrew> errors when transmitting data. > > > > Andrew> Relevant timing diagrams from the logic analyzer are > >attached to > > Andrew> this bug: > >https://bugzilla.kernel.org/show_bug.cgi?id=47921 > > > >Is this a driver or a hardware thing? > > I think that this is a driver problem, since windows drivers do not > produce any framing errors. > I stumbled upon this while reversing the STC microcontroller ISP > protocol that happen to use 'even' parity. > I can send in more timing diagrams both from windows and linux hosts > to compare. I don't see how the ftdi device can change the timings of the signals by the USB side at all, do you? That implies that it couldn't be the driver as it has no control over this type of thing. Or am I missing something from the device spec somewhere? thanks, greg k-h -- 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
