[PATCH RFC v1 0/7] serial: imx: fix RTS and RTS/CTS handling

The patches are not tested yet, so the RFC in the header. I'll re-roll
without RFC once Sasha Hauer tests them.

Sasha, in addition to already discussed fixes, I've also reordered 2
patches so that the sequence makes sense.

Changelog:

  v1:

      * Fixed in "serial: imx: set_termios(): preserve RTS state"

-+	ucr2 = UCR2_SRST | UCR2_IRTS;
++	ucr2 |= UCR2_SRST | UCR2_IRTS;
      
        as noticed by Lothar Waßmann [off-list ref]

      * Fixed in "serial: imx: set_termios(): preserve RTS state"
      
-+	ucr2 = old_ucr2 & (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN | UCR2_CTSC);
++	ucr2 = old_ucr2 & (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN | UCR2_CTS);

        as the fix for the problem found by Sascha Hauer
        [off-list ref]

      * Reordered:

        serial: imx: set_termios(): preserve RTS state
        serial: imx: set_termios(): do not enable autoRTS if RTS is unset

        as the latter makes sense only provided the former is already applied.
      

Sergey Organov (7):
  serial: imx: fix locking in set_termios()
  serial: imx: set_termios(): factor-out 'ucr2' initial value
  serial: imx: set_termios(): clarify RTS/CTS bits calculation
  serial: imx: set_termios(): preserve RTS state
  serial: imx: set_termios(): do not enable autoRTS if RTS is unset
  serial: imx: set_mctrl(): correctly restore autoRTS state
  serial: imx: get rid of imx_uart_rts_auto()

 drivers/tty/serial/imx.c | 93 ++++++++++++++++++++++++------------------------
 1 file changed, 47 insertions(+), 46 deletions(-)

--
2.10.0.1.g57b01a3

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