diff options
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 61 |
1 files changed, 52 insertions, 9 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 3dedd2470db1..d6aea85a9b14 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -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); |
