tree 35632fc6ee5b89e0d947c82057285b4c6fcb552a
parent 20b5af93505cba9d55577f576fcd0d162eb2ad4a
author Matt Redfearn <matt.redfearn@imgtec.com> 1441727734 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1443977269 +0100

serial: 8250_ingenic: Enable hardware flow control

The Ingenic UART is similar to a standard 16550, but hardware flow control
requires setting a couple of additional, non-standard bits in the MCR.

The non-standard "modem control enable" and "hardware flow control
mode" bits are set when writing to the MCR register, based
on whether the modem control interrupt is active.

Additionally the non-16550 compliant parts of the uart need to be
masked from higher layers.

Tested on Ingenic JZ4780 on MIPS Creator Ci20 board

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>