[PATCHv3 3/8] serial: imx: allow waking up on RTSD

From: Eduardo Valentin
Date: Tue Aug 11 2015 - 13:23:52 EST

This patch sets RTSDEN bit when going into idle (Stop mode).
We add the RTSDEN for the case RTS is sent from
the remote connection. This way we allow the system
to wakeup when RTS is received.

Cc: Fabio Stevam <festevam@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Eduardo Valentin <edubezval@xxxxxxxxx>
drivers/tty/serial/imx.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 3c2b0ac..167dea1 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1982,6 +1982,13 @@ static void serial_imx_enable_wakeup(struct imx_port *sport, bool on)
val &= ~UCR3_AWAKEN;
writel(val, sport->port.membase + UCR3);
+ val = readl(sport->port.membase + UCR1);
+ if (on)
+ val |= UCR1_RTSDEN;
+ else
+ val &= ~UCR1_RTSDEN;
+ writel(val, sport->port.membase + UCR1);

static int imx_serial_port_suspend_noirq(struct device *dev)

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