[v4,0/3] serial: imx: fix RTS and RTS/CTS handling
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  • serial: imx: fix RTS and RTS/CTS handling
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Sergey Organov July 19, 2019, 8:47 a.m. UTC
This is rebase of v3 on top of 'tty-next', to get rid of commits that
are already adopted to mainline.

RTS signal and RTS/CTS handshake handling had a few problems these
patches fix.

In addition, minor cleanups are made to the involved code.

Changelog:

  v4:

      * rebased on top of 'tty-next', to get rid of commits that
        are already adopted to mainline.

  v3:

      * Improved comments in "serial: imx: set_mctrl(): correctly
        restore autoRTS state", as suggested by Uwe Kleine-König
        <u.kleine-koenig@pengutronix.de>

  v2:

      * Appended: "Reviewed-by:" and "Tested-by:"
        Sascha Hauer <s.hauer@pengutronix.de>

      * Removed "RFC" from header

  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 <LW@KARO-electronics.de>

      * 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
        <s.hauer@pengutronix.de>

      * 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 (3):
  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 | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

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2.10.0.1.g57b01a3