From a6833214cfc6fa8a7c59426af77794cc190c6cfc Mon Sep 17 00:00:00 2001 From: Steffen Trumtrar Date: Thu, 13 Dec 2012 14:27:43 +0100 Subject: [PATCH] mxs: uart: fix setting RTS from software With the patch "serial: mxs-auart: fix the wrong RTS hardware flow control" the mainline mxs-uart driver now sets RTSEN only when hardware flow control is enabled via software. It is not possible any longer to set RTS manually via software. However, the manual modification is a valid operation. Regain the possibility to set RTS via software and only set RTSEN when hardware flow control is explicitly enabled via settermios cflag CRTSCTS. Signed-off-by: Steffen Trumtrar Cc: stable Reviewed-by: Huang Shijie Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mxs-auart.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 6db23b0..9f63f88 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -412,10 +412,12 @@ static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) u32 ctrl = readl(u->membase + AUART_CTRL2); - ctrl &= ~AUART_CTRL2_RTSEN; + ctrl &= ~(AUART_CTRL2_RTSEN | AUART_CTRL2_RTS); if (mctrl & TIOCM_RTS) { if (tty_port_cts_enabled(&u->state->port)) ctrl |= AUART_CTRL2_RTSEN; + else + ctrl |= AUART_CTRL2_RTS; } s->ctrl = mctrl; -- 2.7.4