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Commit d62100f1 authored by Shubhrajyoti Datta's avatar Shubhrajyoti Datta Committed by Greg Kroah-Hartman
Browse files

serial: xilinx_uartps: Add pm runtime support 



Adds pm runtime support to xilinx uart ps.

Signed-off-by: default avatarShubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f48180a7

drivers/tty/serial/xilinx_uartps.c

+42 −8
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/io.h>

#include <linux/of.h>

#include <linux/module.h>

#include <linux/pm_runtime.h>



#define CDNS_UART_TTY_NAME	"ttyPS"

#define CDNS_UART_NAME		"xuartps"
@@ -176,6 +177,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); 
#define CDNS_UART_BDIV_MIN	4

#define CDNS_UART_BDIV_MAX	255

#define CDNS_UART_CD_MAX	65535

#define UART_AUTOSUSPEND_TIMEOUT	3000



/**

 * struct cdns_uart - device data
@@ -1065,16 +1067,13 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c) 
static void cdns_uart_pm(struct uart_port *port, unsigned int state,

		   unsigned int oldstate)

{

	struct cdns_uart *cdns_uart = port->private_data;



	switch (state) {

	case UART_PM_STATE_OFF:

		clk_disable(cdns_uart->uartclk);

		clk_disable(cdns_uart->pclk);

		pm_runtime_mark_last_busy(port->dev);

		pm_runtime_put_autosuspend(port->dev);

		break;

	default:

		clk_enable(cdns_uart->pclk);

		clk_enable(cdns_uart->uartclk);

		pm_runtime_get_sync(port->dev);

		break;

	}

}
@@ -1436,9 +1435,33 @@ static int cdns_uart_resume(struct device *device) 
	return uart_resume_port(&cdns_uart_uart_driver, port);

}

#endif /* ! CONFIG_PM_SLEEP */

static int __maybe_unused cdns_runtime_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct uart_port *port = platform_get_drvdata(pdev);

	struct cdns_uart *cdns_uart = port->private_data;



static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,

		cdns_uart_resume);

	clk_disable(cdns_uart->uartclk);

	clk_disable(cdns_uart->pclk);

	return 0;

};



static int __maybe_unused cdns_runtime_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct uart_port *port = platform_get_drvdata(pdev);

	struct cdns_uart *cdns_uart = port->private_data;



	clk_enable(cdns_uart->pclk);

	clk_enable(cdns_uart->uartclk);

	return 0;

};



static const struct dev_pm_ops cdns_uart_dev_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(cdns_uart_suspend, cdns_uart_resume)

	SET_RUNTIME_PM_OPS(cdns_runtime_suspend,

			   cdns_runtime_resume, NULL)

};



static const struct cdns_platform_data zynqmp_uart_def = {

				.quirks = CDNS_UART_RXBS_SUPPORT, };
@@ -1558,6 +1581,11 @@ static int cdns_uart_probe(struct platform_device *pdev) 
	cdns_uart_data->port = port;

	platform_set_drvdata(pdev, port);



	pm_runtime_use_autosuspend(&pdev->dev);

	pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);

	pm_runtime_enable(&pdev->dev);

	pm_runtime_set_active(&pdev->dev);



	rc = uart_add_one_port(&cdns_uart_uart_driver, port);

	if (rc) {

		dev_err(&pdev->dev,
@@ -1573,6 +1601,9 @@ static int cdns_uart_probe(struct platform_device *pdev) 
			&cdns_uart_data->clk_rate_change_nb);

#endif

err_out_clk_disable:

	pm_runtime_disable(&pdev->dev);

	pm_runtime_set_suspended(&pdev->dev);

	pm_runtime_dont_use_autosuspend(&pdev->dev);

	clk_unprepare(cdns_uart_data->uartclk);

err_out_clk_dis_pclk:

	clk_unprepare(cdns_uart_data->pclk);
@@ -1601,6 +1632,9 @@ static int cdns_uart_remove(struct platform_device *pdev) 
	port->mapbase = 0;

	clk_unprepare(cdns_uart_data->uartclk);

	clk_unprepare(cdns_uart_data->pclk);

	pm_runtime_disable(&pdev->dev);

	pm_runtime_set_suspended(&pdev->dev);

	pm_runtime_dont_use_autosuspend(&pdev->dev);

	return rc;

}