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author | Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> | 2017-03-09 11:19:07 +0530 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-14 11:01:40 +0800 |
commit | d62100f1aac28d18057c05410f706c65baf748fa (patch) | |
tree | 05c727932bcdc1a20eb6556d0e61c314156afef8 /drivers/tty/serial/xilinx_uartps.c | |
parent | f48180a70e2f2676f87ba70c08f779ea9e699cc6 (diff) | |
download | linux-stable-d62100f1aac28d18057c05410f706c65baf748fa.tar.gz linux-stable-d62100f1aac28d18057c05410f706c65baf748fa.tar.bz2 linux-stable-d62100f1aac28d18057c05410f706c65baf748fa.zip |
serial: xilinx_uartps: Add pm runtime support
Adds pm runtime support to xilinx uart ps.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/xilinx_uartps.c')
-rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 50 |
1 files changed, 42 insertions, 8 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index ad77d0ed0c46..7afa50b07875 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -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 @@ err_out_notif_unreg: &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; } |