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Commit ffc3ae6d authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Greg Kroah-Hartman
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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
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+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);