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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 <fabio.estevam@nxp.com>
Reviewed-by: Martin Kaiser <martin@kaiser.cx>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabio Estevam 2018-01-04 15:58:34 -02:00 committed by Greg Kroah-Hartman
parent 7defa77d2b
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; val &= ~UCR3_AWAKEN;
writel(val, sport->port.membase + UCR3); writel(val, sport->port.membase + UCR3);
val = readl(sport->port.membase + UCR1); if (sport->have_rtscts) {
if (on) val = readl(sport->port.membase + UCR1);
val |= UCR1_RTSDEN; if (on)
else val |= UCR1_RTSDEN;
val &= ~UCR1_RTSDEN; else
writel(val, sport->port.membase + UCR1); val &= ~UCR1_RTSDEN;
writel(val, sport->port.membase + UCR1);
}
} }
static int imx_serial_port_suspend_noirq(struct device *dev) static int imx_serial_port_suspend_noirq(struct device *dev)