Sorry for misunderstanding, I've tested the behavior of Arduino board on 2 machines and the result is following: PASSED - Arduino board was connected successfully FAILED - ch341 errors arose 1st machine [USB 3.0] -- Linux 3.18 -- PASSED 1st machine [USB 3.0] -- Linux 4.* -- FAILED 2nd machine [USB 2.0] -- Linux 3.18 -- PASSED 2nd machine [USB 2.0] -- Linux 4.0 -- PASSED Therefore Jonah Hovold was right and root cause was underlying xhci driver. 2015-07-07 10:55 GMT+03:00 Johan Hovold <johan@xxxxxxxxxx>: > On Mon, Jul 06, 2015 at 03:24:17PM +0200, Peter Stuge wrote: > >> Unrelated, but I also have some ch341 hardware, and mine does not >> work with the mainline driver, it does however work reliably with the >> vendor driver. >> >> The two drivers initialize the hardware fairly differently, >> especially the baudrate generator, and the mainline driver doesn't >> support all control signals and modes. >> >> A few things are obvious and easy for me to fix and post, but I'm not >> sure how to proceed with the more complicated things; the baudrate >> seems to have two settings, one clock divisor set on init and another >> set depending on the selected baudrate. Mainline uses a different >> algorithm to set these than the vendor driver. >> >> I notice that my hardware version is more recent than the mainline >> driver was written for. I also notice that my hardware does not >> respond according to the expectations documented in mainline >> comments. >> >> >> Your thoughts? I know that another person was also working on this. > > It should be possible to detect what version of the hardware is being > used and switch baudrate-configuration scheme accordingly if necessary. > Does anyone know how the vendor driver works with older devices? > > I've added Karl on CC who I think have been working on getting these new > devices supported as well. > > Thanks, > 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
