diff options
| author | Philipp Zabel <p.zabel@pengutronix.de> | 2017-11-01 13:51:41 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-04 12:13:45 +0100 |
| commit | 94be6d74d040c614a332555f5b6d57c26dc272fc (patch) | |
| tree | e1260465bca2db039fb9a9f9da656e69d81b998f /drivers/tty | |
| parent | 2a76fa2830981e15bfa33c2b0e5f2dfd35b0455c (diff) | |
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 <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 76818a266403..2d042c60d2fa 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 = { |