On Tue, Dec 13, 2011 at 01:23:48AM -0200, Fabio Estevam wrote:
> 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: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>
> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
For imx6q sabrelite,
Tested-by: Richard Zhao <richard.zhao@xxxxxxxxxxxxx>
> ---
> Changes since v4:
> - Let serial core handle device_init_wakeup/device_set_wakeup_enable.
> Changes since v3:
> - Remove IMXUART_CANWAKE flag. Let userspace write in /sys/ file
> in order to enable UART wakeup source.
> Changes since v2:
> - Remove incorrect enable_irq_wake from serial_imx_resume
> Changes since v1:
> - Pass the can-wake property via DT correctly
> drivers/tty/serial/imx.c | 15 +++++++++++++++
> 1 files changed, 15 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 163fc90..0022bbd 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -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);
> @@ -1279,7 +1288,13 @@ 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);
>
> --
> 1.7.1
>
>
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>
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