On Thu, Jan 21, 2021 at 11:29:12AM +0100, Johan Hovold wrote: > The CP210X_SET_MHS request cannot be used to control DTR/RTS when > hardware flow control is enabled and instead returns an error which is > currently logged as: > > cp210x ttyUSB0: failed set request 0x7 status: -32 > > Add a crtscts flag to keep track of the hardware flow-control setting > and use it to suppress the request in dtr_rts(). > > Note that both lines are still deasserted when disabling the UART as > part of close(). > > Also note that TIOCMSET is left unchanged and will continue to return an > error to user-space when flow control is enabled (i.e. instead of > disabling and re-enabling auto-RTS when RTS is deasserted and > re-asserted). > > Reported-by: Pho Tran <pho.tran@xxxxxxxxxx> > Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> > --- Oops, this one wasn't supposed to be submitted again. Please ignore. Johan
