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Subject[LINUX PATCHv3 4/9] serial-uartlite: Add runtime support
Date
From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add runtime support

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
drivers/tty/serial/uartlite.c | 52 +++++++++++++++++++++++++++++++++++--------
1 file changed, 43 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 64c7248..58296eb 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -22,6 +22,7 @@
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
+#include <linux/pm_runtime.h>

#define ULITE_NAME "ttyUL"
#define ULITE_MAJOR 204
@@ -54,6 +55,7 @@
#define ULITE_CONTROL_RST_TX 0x01
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
+#define UART_AUTOSUSPEND_TIMEOUT 3000

/* Static pointer to console port */
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
@@ -391,12 +393,12 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
static void ulite_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
- struct uartlite_data *pdata = port->private_data;
-
- if (!state)
- clk_enable(pdata->clk);
- else
- clk_disable(pdata->clk);
+ if (!state) {
+ pm_runtime_get_sync(port->dev);
+ } else {
+ pm_runtime_mark_last_busy(port->dev);
+ pm_runtime_put_autosuspend(port->dev);
+ }
}

#ifdef CONFIG_CONSOLE_POLL
@@ -738,11 +740,32 @@ static int __maybe_unused ulite_resume(struct device *dev)
return 0;
}

+static int __maybe_unused ulite_runtime_suspend(struct device *dev)
+{
+ struct uart_port *port = dev_get_drvdata(dev);
+ struct uartlite_data *pdata = port->private_data;
+
+ clk_disable(pdata->clk);
+ return 0;
+};
+
+static int __maybe_unused ulite_runtime_resume(struct device *dev)
+{
+ struct uart_port *port = dev_get_drvdata(dev);
+ struct uartlite_data *pdata = port->private_data;
+
+ clk_enable(pdata->clk);
+ return 0;
+}
/* ---------------------------------------------------------------------
* Platform bus binding
*/

-static SIMPLE_DEV_PM_OPS(ulite_pm_ops, ulite_suspend, ulite_resume);
+static const struct dev_pm_ops ulite_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ulite_suspend, ulite_resume)
+ SET_RUNTIME_PM_OPS(ulite_runtime_suspend,
+ ulite_runtime_resume, NULL)
+};

#if defined(CONFIG_OF)
/* Match table for of_platform binding */
@@ -815,9 +838,15 @@ static int ulite_probe(struct platform_device *pdev)
return ret;
}

+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
ret = ulite_assign(&pdev->dev, id, res->start, irq, pdata);

- clk_disable(pdata->clk);
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);

return ret;
}
@@ -826,9 +855,14 @@ static int ulite_remove(struct platform_device *pdev)
{
struct uart_port *port = dev_get_drvdata(&pdev->dev);
struct uartlite_data *pdata = port->private_data;
+ int rc;

clk_disable_unprepare(pdata->clk);
- return ulite_release(&pdev->dev);
+ rc = ulite_release(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+ return rc;
}

/* work with hotplug and coldplug */
--
2.1.1
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