Hello, On Wed, Nov 14, 2018 at 11:33:25PM +0100, Adam Rudziński wrote: > returning to our discussion on incorrect handling of CTSb used as "driver > enable" by SERIAL_IMX driver in RS485 mode, I've made the fix I was able to, > ie. the simple one with just keeping the receiver of the UART on. Eventually > this got tested in action and worked fine. > > The kernel I used is a version of ancient 4.14.39, possibly with some > vendor-specific patches. I tried to compare it with the most recent > long-term 4.14.81, but there are changes which I can't interpret without > deeper studies (however, it seems to me that the original problem would > still be present). Newer kernels have even more differences. > > If such fix could be useful, and somebody feels like undertaking the effort > to implement it in a proper way, the fix can be found under this address > (along with a short description): > http://arf.net.pl/iMX6/RS485fix.html How does the relevant part of your dts look like? Did you try to use a gpio instead of the hardware function "CTS" as rts? Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ |
