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Commit ffc3ae6d authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Greg Kroah-Hartman
Browse files

serial: 8250_dw: Enable runtime PM 



This allows ACPI to put the device to D3 when it's not used.

Signed-off-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ab19479a

drivers/tty/serial/8250/8250_dw.c

+52 −9
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/slab.h>

#include <linux/acpi.h>

#include <linux/clk.h>

#include <linux/pm_runtime.h>



#include "8250.h"
@@ -115,6 +116,18 @@ static int dw8250_handle_irq(struct uart_port *p) 
	return 0;

}



static void

dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)

{

	if (!state)

		pm_runtime_get_sync(port->dev);



	serial8250_do_pm(port, state, old);



	if (state)

		pm_runtime_put_sync_suspend(port->dev);

}



static int dw8250_probe_of(struct uart_port *p)

{

	struct device_node	*np = p->dev->of_node;
@@ -293,6 +306,7 @@ static int dw8250_probe(struct platform_device *pdev) 
	uart.port.mapbase = regs->start;

	uart.port.irq = irq->start;

	uart.port.handle_irq = dw8250_handle_irq;

	uart.port.pm = dw8250_do_pm;

	uart.port.type = PORT_8250;

	uart.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;

	uart.port.dev = &pdev->dev;
@@ -336,6 +350,9 @@ static int dw8250_probe(struct platform_device *pdev) 


	platform_set_drvdata(pdev, data);



	pm_runtime_set_active(&pdev->dev);

	pm_runtime_enable(&pdev->dev);



	return 0;

}
@@ -343,37 +360,64 @@ static int dw8250_remove(struct platform_device *pdev) 
{

	struct dw8250_data *data = platform_get_drvdata(pdev);



	pm_runtime_get_sync(&pdev->dev);



	serial8250_unregister_port(data->line);



	if (!IS_ERR(data->clk))

		clk_disable_unprepare(data->clk);



	pm_runtime_disable(&pdev->dev);

	pm_runtime_put_noidle(&pdev->dev);



	return 0;

}



#ifdef CONFIG_PM

static int dw8250_suspend(struct platform_device *pdev, pm_message_t state)

static int dw8250_suspend(struct device *dev)

{

	struct dw8250_data *data = platform_get_drvdata(pdev);

	struct dw8250_data *data = dev_get_drvdata(dev);



	serial8250_suspend_port(data->line);



	return 0;

}



static int dw8250_resume(struct platform_device *pdev)

static int dw8250_resume(struct device *dev)

{

	struct dw8250_data *data = platform_get_drvdata(pdev);

	struct dw8250_data *data = dev_get_drvdata(dev);



	serial8250_resume_port(data->line);



	return 0;

}

#else

#define dw8250_suspend NULL

#define dw8250_resume NULL

#endif /* CONFIG_PM */



#ifdef CONFIG_PM_RUNTIME

static int dw8250_runtime_suspend(struct device *dev)

{

	struct dw8250_data *data = dev_get_drvdata(dev);



	clk_disable_unprepare(data->clk);



	return 0;

}



static int dw8250_runtime_resume(struct device *dev)

{

	struct dw8250_data *data = dev_get_drvdata(dev);



	clk_prepare_enable(data->clk);



	return 0;

}

#endif



static const struct dev_pm_ops dw8250_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(dw8250_suspend, dw8250_resume)

	SET_RUNTIME_PM_OPS(dw8250_runtime_suspend, dw8250_runtime_resume, NULL)

};



static const struct of_device_id dw8250_of_match[] = {

	{ .compatible = "snps,dw-apb-uart" },

	{ /* Sentinel */ }
@@ -391,13 +435,12 @@ static struct platform_driver dw8250_platform_driver = { 
	.driver = {

		.name		= "dw-apb-uart",

		.owner		= THIS_MODULE,

		.pm		= &dw8250_pm_ops,

		.of_match_table	= dw8250_of_match,

		.acpi_match_table = ACPI_PTR(dw8250_acpi_match),

	},

	.probe			= dw8250_probe,

	.remove			= dw8250_remove,

	.suspend		= dw8250_suspend,

	.resume			= dw8250_resume,

};



module_platform_driver(dw8250_platform_driver);