From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Thu, 24 Mar 2016 13:24:20 +0000 (+0100)
Subject: serial: imx: fix polarity of RI
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e881d3f3fafc849356ecd1e3a2f3bf669476ed2d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

serial: imx: fix polarity of RI

When in DTE mode, the bit USR2_RIIN is active low. So invert the logic
accordingly.

Fixes: 90ebc4838666 ("serial: imx: repair and complete handshaking")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 66cc3d198dcf..7cfb482bbc5c 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -800,9 +800,9 @@ static unsigned int imx_get_hwmctrl(struct imx_port *sport)
 	if (!(usr1 & USR2_DCDIN))
 		tmp |= TIOCM_CAR;
 
-	/* in DCE mode RIIN is always 0 */
-	if (readl(sport->port.membase + USR2) & USR2_RIIN)
-		tmp |= TIOCM_RI;
+	if (sport->dte_mode)
+		if (!(readl(sport->port.membase + USR2) & USR2_RIIN))
+			tmp |= TIOCM_RI;
 
 	return tmp;
 }