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.za...@pengutronix.de>
---
drivers/tty/serial/imx.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index dfeff3951f934..6bbe7dd58ac62 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2346,11 +2346,39 @@ 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 = {
--
2.11.0
