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Commit db1a9b55 authored by Fabio Estevam's avatar Fabio Estevam Committed by Greg Kroah-Hartman
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tty: serial: imx: Allow UART to be a source for wakeup 



Allow UART to be a source for wakeup from low power mode.

Tested on a MX27PDK by doing:

echo enabled > /sys/devices/platform/imx21-uart.0/tty/ttymxc0/power/wakeup

echo mem > /sys/power/state

and then pressing a key in the console will wakeup the sytem.

Suggested-by: default avatarShawn Guo <shawn.guo@freescale.com>
Signed-off-by: default avatarFabio Estevam <fabio.estevam@freescale.com>
Tested-by: default avatarRichard Zhao <richard.zhao@freescale.com>
Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 59087384

drivers/tty/serial/imx.c

+15 −0
Original line number Diff line number Diff line
@@ -566,6 +566,9 @@ static irqreturn_t imx_int(int irq, void *dev_id) 
	if (sts & USR1_RTSD)

		imx_rtsint(irq, dev_id);



	if (sts & USR1_AWAKE)

		writel(USR1_AWAKE, sport->port.membase + USR1);



	return IRQ_HANDLED;

}
@@ -1269,6 +1272,12 @@ static struct uart_driver imx_reg = { 
static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)

{

	struct imx_port *sport = platform_get_drvdata(dev);

	unsigned int val;



	/* enable wakeup from i.MX UART */

	val = readl(sport->port.membase + UCR3);

	val |= UCR3_AWAKEN;

	writel(val, sport->port.membase + UCR3);



	if (sport)

		uart_suspend_port(&imx_reg, &sport->port);
@@ -1279,6 +1288,12 @@ static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) 
static int serial_imx_resume(struct platform_device *dev)

{

	struct imx_port *sport = platform_get_drvdata(dev);

	unsigned int val;



	/* disable wakeup from i.MX UART */

	val = readl(sport->port.membase + UCR3);

	val &= ~UCR3_AWAKEN;

	writel(val, sport->port.membase + UCR3);



	if (sport)

		uart_resume_port(&imx_reg, &sport->port);