El 3/6/21 a las 16:48, David Frey escribió:
Hi Johan, I have added linux-usb@xxxxxxxxxxxxxxx to the CC as requested.
It appears that in the 5.12.8 kernel, there is a failure every time cp210x_tiocmset_port is called resulting from this: ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
Sorry to butt in, but if you are comfortable compiling kernel code, try manually reverting only commit f61309d9c96a308465bec9d2e5206da265b075a0 (USB: serial: cp210x: set IXOFF thresholds) and loading the resulting .ko module. I do that to keep working in my ESP32 projects while this issue gets a proper fix. More details at bug report at https://bugzilla.redhat.com/show_bug.cgi?id=1965527
Just a guess: maybe ulXonLimit and ulXoffLimit should only be non-zero when actually enabling software flow control, and must be set to zero otherwise? The faulty commit just assigns them unconditionally to 128.
