diff options
| author |   Sergey Organov <sorganov@gmail.com> | 2019-06-26 17:11:29 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-03 19:35:41 +0200 |
| commit | ddf89e7503deb931403add648b67545ec196c3fe (patch) | |
| tree | c6475bec43b4fccbc16bdfd2005aab396b7c2163 /drivers/tty | |
| parent | serial: imx: set_termios(): factor-out 'ucr2' initial value (diff) | |
| download | linux-dev-ddf89e7503deb931403add648b67545ec196c3fe.tar.xz linux-dev-ddf89e7503deb931403add648b67545ec196c3fe.zip | |
serial: imx: set_termios(): clarify RTS/CTS bits calculation
Avoid repeating the same code for rs485 twice.
Make it obvious we clear CRTSCTS bit in termios->c_cflag whenever
sport->have_rtscts is false.
Make it obvious we clear UCR2_IRTS whenever CRTSCTS is set.
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/1561558293-7683-4-git-send-email-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 38 |
1 files changed, 14 insertions, 24 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index df2186cac615..1cb891b4eaa0 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1566,35 +1566,25 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios, if ((termios->c_cflag & CSIZE) == CS8) ucr2 |= UCR2_WS; - if (termios->c_cflag & CRTSCTS) { - if (sport->have_rtscts) { - ucr2 &= ~UCR2_IRTS; - - if (port->rs485.flags & SER_RS485_ENABLED) { - /* - * RTS is mandatory for rs485 operation, so keep - * it under manual control and keep transmitter - * disabled. - */ - if (port->rs485.flags & - SER_RS485_RTS_AFTER_SEND) - imx_uart_rts_active(sport, &ucr2); - else - imx_uart_rts_inactive(sport, &ucr2); - } else { - imx_uart_rts_auto(sport, &ucr2); - } - } else { - termios->c_cflag &= ~CRTSCTS; - } - } else if (port->rs485.flags & SER_RS485_ENABLED) { - /* disable transmitter */ + if (!sport->have_rtscts) + termios->c_cflag &= ~CRTSCTS; + + if (port->rs485.flags & SER_RS485_ENABLED) { + /* + * RTS is mandatory for rs485 operation, so keep + * it under manual control and keep transmitter + * disabled. + */ if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) imx_uart_rts_active(sport, &ucr2); else imx_uart_rts_inactive(sport, &ucr2); - } + } else if (termios->c_cflag & CRTSCTS) + imx_uart_rts_auto(sport, &ucr2); + + if (termios->c_cflag & CRTSCTS) + ucr2 &= ~UCR2_IRTS; if (termios->c_cflag & CSTOPB) ucr2 |= UCR2_STPB; |