diff options
| author | Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> | 2018-10-16 15:48:03 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-09 08:45:07 -0800 |
| commit | 0379b1163e509cfc4c18643b27231c04c78981ab (patch) | |
| tree | a798a548ba75101137c5380e5aae64e8a06c13c7 /drivers/tty | |
| parent | 3b209d253e7f8aa01fde0233d38a7239c8f7beb3 (diff) | |
| download | linux-0379b1163e509cfc4c18643b27231c04c78981ab.tar.bz2 | |
serial-uartlite: Add runtime support
Add runtime support
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/uartlite.c | 52 |
1 files changed, 43 insertions, 9 deletions
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index 64c7248fe5fc..58296ebb9f7e 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 */ |