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Commit 94be6d74 authored by Philipp Zabel's avatar Philipp Zabel Committed by Greg Kroah-Hartman
Browse files

serial: imx: add hibernation support 



During hibernation, freeze/thaw/restore dev_pm_ops are called instead of
suspend/resume. Hook up the hibernation ops. The _noirq parts are
identical, but suspend/resume are replaced with variants that do not
enable wakeup from i.MX UART. There is no need to restore register
contents in thaw_noirq.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2a76fa28

drivers/tty/serial/imx.c

+28 −0
Original line number Diff line number Diff line
@@ -2350,11 +2350,39 @@ static int imx_serial_port_resume(struct device *dev) 
	return 0;

}



static int imx_serial_port_freeze(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct imx_port *sport = platform_get_drvdata(pdev);



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



	/* Needed to enable clock in suspend_noirq */

	return clk_prepare(sport->clk_ipg);

}



static int imx_serial_port_thaw(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct imx_port *sport = platform_get_drvdata(pdev);



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



	clk_unprepare(sport->clk_ipg);



	return 0;

}



static const struct dev_pm_ops imx_serial_port_pm_ops = {

	.suspend_noirq = imx_serial_port_suspend_noirq,

	.resume_noirq = imx_serial_port_resume_noirq,

	.freeze_noirq = imx_serial_port_suspend_noirq,

	.restore_noirq = imx_serial_port_resume_noirq,

	.suspend = imx_serial_port_suspend,

	.resume = imx_serial_port_resume,

	.freeze = imx_serial_port_freeze,

	.thaw = imx_serial_port_thaw,

	.restore = imx_serial_port_thaw,

};



static struct platform_driver serial_imx_driver = {