Commit a25aee90 authored Jul 26, 2019 by Sergey Organov Committed by Greg Kroah-Hartman Sep 04, 2019

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>

parent 72d81961

drivers/tty/serial/imx.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -405,6 +405,11 @@ 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)
		{
		/*
		* 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;
		}