On 11/05/2014 11:39 AM, Johannes Thumshirn wrote: > On Mon, Nov 03, 2014 at 04:26:39PM -0500, Peter Hurley wrote: >> On 11/03/2014 04:01 PM, Peter Hurley wrote: >>> On 11/03/2014 11:05 AM, Johannes Thumshirn wrote: >>>> * Enable the handling of UART core's automatic flow control feature. >>>> When AFE is active disable generation of modem status IRQs. >>> >>> So HUPCL doesn't work when CRTSCTS is set? >> >> Sorry, I meant !CLOCAL. IOW, >> >> 'So !CLOCAL doesn't work when CRTSCTS is set?' > > Yes, unfortunately Then you want to reset CLOCAL back on in the termios when you enable auto flow control. That way, the process can see which termios changes were successful and which were unsuccessful. Plus, it keeps the serial core state sync'd with the driver. Optionally, you could consider overriding CRTSCTS when !CLOCAL; iow, if !CLOCAL, then disable CRTSCTS instead. (In that case, you would reset CRTSCTS in the termios as well, so the process would be aware of the changes). >> >>> Is this because there's actually a problem with the IP core that >>> MSIs trash the autoCTS state, or is the problem that the driver >>> just shouldn't be calling uart_handle_cts_change() when autoCTS is >>> on? >> > > From our investigations it looks like it trashes the autoCTS state. Ok. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
