This is a note to let you know that I've just added the patch titled
serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-imx-only-wakeup-via-rtsden-bit-if-the-system-has-rts-cts.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 38b1f0fb42f772b8c9aac53593883a18ff5eb9d7 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <fabio.estevam@xxxxxxx>
Date: Thu, 4 Jan 2018 15:58:34 -0200
Subject: serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS
From: Fabio Estevam <fabio.estevam@xxxxxxx>
commit 38b1f0fb42f772b8c9aac53593883a18ff5eb9d7 upstream.
The wakeup mechanism via RTSDEN bit relies on the system using the RTS/CTS
lines, so only allow such wakeup method when the system actually has
RTS/CTS support.
Fixes: bc85734b126f ("serial: imx: allow waking up on RTSD")
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxx>
Reviewed-by: Martin Kaiser <martin@xxxxxxxxx>
Acked-by: Fugang Duan <fugang.duan@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2275,12 +2275,14 @@ static void serial_imx_enable_wakeup(str
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);
+ if (sport->have_rtscts) {
+ 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)
Patches currently in stable-queue which might be from fabio.estevam@xxxxxxx are
queue-4.14/serial-imx-only-wakeup-via-rtsden-bit-if-the-system-has-rts-cts.patch