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authorFabio Estevam <fabio.estevam@nxp.com>2018-01-04 15:58:34 -0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-03 17:05:43 +0100
commit5846849a1ac75c4a4898f09f3835ac737bb888d5 (patch)
treee5f465006a2f5b906826f35689d31b0a14ca4d44
parent9df847674ede722e12094def6520fd2ff98452df (diff)
serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS
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@nxp.com> Reviewed-by: Martin Kaiser <martin@kaiser.cx> Acked-by: Fugang Duan <fugang.duan@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/imx.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index a70356dad1b7..521a6e450755 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2239,12 +2239,14 @@ 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);
+ 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)