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Sudhakar Mamillapalli authored
When using Serial Over Lan (SOL) over the virtual serial port in a Intel management engine (ME) device, on device reset the serial FIFOs need to be cleared to keep the FIFO indexes in-sync between the host and the engine. On a reset the serial device assertes BI, so using that as a cue FIFOs are cleared. So for this purpose a new handle_break callback has been added. One other problem is that the serial registers might temporarily go to 0 on reset of this device. So instead of using the IER register read, if 0 returned use the ier value in uart_8250_port. This is hidden under a custom serial_in. Cc: Nhan H Mai <nhan.h.mai@intel.com> Signed-off-by: Sudhakar Mamillapalli <sudhakar@fb.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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