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

Don't let receiver hardware automatically control RTS output if it
was requested to be inactive.

To ensure this, set_termios() shouldn't set UCR2_CTSC bit if UCR2_CTS
(=TIOCM_RTS) is cleared. Added corresponding check in imx_uart_rts_auto()
to fix this.

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
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/1564167161-3972-2-git-send-email-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergey Organov 2019-07-26 21:52:39 +03:00 committed by Greg Kroah-Hartman
parent 72d819612a
commit a25aee902e
1 changed files with 6 additions and 1 deletions
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7
drivers/tty/serial/imx.c
View File

@ -405,7 +405,12 @@ static void imx_uart_rts_inactive(struct imx_port *sport, u32 *ucr2)
/* called with port.lock taken and irqs caller dependent */
static void imx_uart_rts_auto(struct imx_port *sport, u32 *ucr2)
{
*ucr2 |= UCR2_CTSC;
/*
* Only let receiver control RTS output if we were not requested to have
* RTS inactive (which then should take precedence).
*/
if (*ucr2 & UCR2_CTS)
*ucr2 |= UCR2_CTSC;
}
/* called with port.lock taken and irqs off */