Thread (2 messages) 2 messages, 2 authors, 2011-10-12
STALE5372d

[PATCH v6 09/16] OMAP2+: UART: Add runtime pm support for omap-serial driver

From: Kevin Hilman <hidden>
Date: 2011-10-10 23:42:07
Also in: linux-omap, linux-serial

"Govindraj.R" [off-list ref] writes:
Adapts omap-serial driver to use pm_runtime API's.
[...]
quoted hunk
@@ -1065,19 +1123,18 @@ static struct uart_driver serial_omap_reg = {
 	.cons		= OMAP_CONSOLE,
 };
 
-static int
-serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
+static int serial_omap_suspend(struct device *dev)
 {
-	struct uart_omap_port *up = platform_get_drvdata(pdev);
+	struct uart_omap_port *up = dev_get_drvdata(dev);
 
 	if (up)
 		uart_suspend_port(&serial_omap_reg, &up->port);
 	return 0;
 }
 
-static int serial_omap_resume(struct platform_device *dev)
+static int serial_omap_resume(struct device *dev)
 {
-	struct uart_omap_port *up = platform_get_drvdata(dev);
+	struct uart_omap_port *up = dev_get_drvdata(dev);
 
 	if (up)
 		uart_resume_port(&serial_omap_reg, &up->port);
These functions need to be wrapped in #ifdef CONFIG_SUSPEND, otherwise,
when building with !CONFIG_SUSPEND you'll get :

/work/kernel/omap/pm/drivers/tty/serial/omap-serial.c:1134:12: warning: 'serial_omap_suspend' defined but not used
/work/kernel/omap/pm/drivers/tty/serial/omap-serial.c:1150:12: warning: 'serial_omap_resume' defined but not used


[...]
+static int serial_omap_runtime_suspend(struct device *dev)
+{
+	struct uart_omap_port *up = dev_get_drvdata(dev);
+	struct omap_uart_port_info *pdata = dev->platform_data;
+
+	if (!up)
+		return -EINVAL;
+
+	if (!pdata->enable_wakeup || !pdata->get_context_loss_count)
+		return 0;
+
+	if (pdata->get_context_loss_count)
+		up->context_loss_cnt = pdata->get_context_loss_count(dev);
+
+	if (device_may_wakeup(dev)) {
+		if (!up->wakeups_enabled) {
+			pdata->enable_wakeup(up->pdev, true);
+			up->wakeups_enabled = true;
+		}
+	} else {
+		if (up->wakeups_enabled) {
+			pdata->enable_wakeup(up->pdev, false);
+			up->wakeups_enabled = false;
+		}
+	}
+
+	return 0;
+}
+
+static int serial_omap_runtime_resume(struct device *dev)
+{
+	struct uart_omap_port *up = dev_get_drvdata(dev);
+	struct omap_uart_port_info *pdata = dev->platform_data;
+
+	if (up) {
+		if (pdata->get_context_loss_count) {
+			u32 loss_cnt = pdata->get_context_loss_count(dev);
+
+			if (up->context_loss_cnt != loss_cnt)
+				serial_omap_restore_context(up);
+		}
+	}
+
 	return 0;
 }
Similarily, thse need to be wrapped with #ifdef CONFIG_PM_RUNTIME,
otherwise, when !CONFIG_PM_RUNTIME:

/work/kernel/omap/pm/drivers/tty/serial/omap-serial.c:1498:12: warning: 'serial_omap_runtime_suspend' defined but not used
/work/kernel/omap/pm/drivers/tty/serial/omap-serial.c:1531:12: warning: 'serial_omap_runtime_resume' defined but not used
+static const struct dev_pm_ops serial_omap_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
+	SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
+				serial_omap_runtime_resume, NULL)
+};
+
Note that you don't need #else parts to the above #ifdefs since
the SET_*_OPS() macros used here take care of that.

Kevin
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