From: Philipp Zabel Date: Wed, 1 Nov 2017 12:51:41 +0000 (+0100) Subject: serial: imx: add hibernation support X-Git-Tag: iommu-v4.15-rc3~68^2~20 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=94be6d74d040c614a332555f5b6d57c26dc272fc;p=users%2Fdwmw2%2Flinux.git 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: Philipp Zabel Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 76818a2664031..2d042c60d2fa5 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -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 = {