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serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS

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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: bc85734b12 ("serial: imx: allow waking up on RTSD")
Signed-off-by: Fabio Estevam <[email protected]>
Reviewed-by: Martin Kaiser <[email protected]>
Acked-by: Fugang Duan <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Fabio Estevam 2018-01-04 15:58:34 -02:00 • committed by Greg Kroah-Hartman
commit 38b1f0fb42
1 changed files with 8 additions and 6 deletions
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14
drivers/tty/serial/imx.c
View file

@ -2225,12 +2225,14 @@ 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)