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Signed-off-by: Sherry Sun --- drivers/tty/serial/fsl_lpuart.c | 60 +++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 474943cb06b2..e678a7aaf7e4 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -235,6 +236,7 @@ /* Rx DMA timeout in ms, which is used to calculate Rx ring buffer size */ #define DMA_RX_TIMEOUT (10) +#define UART_AUTOSUSPEND_TIMEOUT 3000 #define DRIVER_NAME "fsl-lpuart" #define DEV_NAME "ttyLP" @@ -795,6 +797,20 @@ static void lpuart32_start_tx(struct uart_port *port) } } +static void +lpuart_uart_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) +{ + switch (state) { + case UART_PM_STATE_OFF: + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + break; + default: + pm_runtime_get_sync(port->dev); + break; + } +} + /* return TIOCSER_TEMT when transmitter is not busy */ static unsigned int lpuart_tx_empty(struct uart_port *port) { @@ -2243,6 +2259,7 @@ static const struct uart_ops lpuart_pops = { .startup = lpuart_startup, .shutdown = lpuart_shutdown, .set_termios = lpuart_set_termios, + .pm = lpuart_uart_pm, .type = lpuart_type, .request_port = lpuart_request_port, .release_port = lpuart_release_port, @@ -2267,6 +2284,7 @@ static const struct uart_ops lpuart32_pops = { .startup = lpuart32_startup, .shutdown = lpuart32_shutdown, .set_termios = lpuart32_set_termios, + .pm = lpuart_uart_pm, .type = lpuart_type, .request_port = lpuart_request_port, .release_port = lpuart_release_port, @@ -2747,6 +2765,11 @@ static int lpuart_probe(struct platform_device *pdev) handler = lpuart_int; } + 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 = lpuart_global_reset(sport); if (ret) goto failed_reset; @@ -2771,6 +2794,9 @@ static int lpuart_probe(struct platform_device *pdev) failed_attach_port: failed_get_rs485: failed_reset: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); lpuart_disable_clks(sport); return ret; } @@ -2789,9 +2815,30 @@ static int lpuart_remove(struct platform_device *pdev) if (sport->dma_rx_chan) dma_release_channel(sport->dma_rx_chan); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); return 0; } +static int __maybe_unused lpuart_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lpuart_port *sport = platform_get_drvdata(pdev); + + lpuart_disable_clks(sport); + + return 0; +}; + +static int __maybe_unused lpuart_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lpuart_port *sport = platform_get_drvdata(pdev); + + return lpuart_enable_clks(sport); +}; + static void serial_lpuart_enable_wakeup(struct lpuart_port *sport, bool on) { unsigned int val, baud; @@ -2937,6 +2984,10 @@ static int __maybe_unused lpuart_suspend(struct device *dev) sport->dma_tx_in_progress = false; dmaengine_terminate_all(sport->dma_tx_chan); } + } else if (pm_runtime_active(sport->port.dev)) { + lpuart_disable_clks(sport); + pm_runtime_disable(sport->port.dev); + pm_runtime_set_suspended(sport->port.dev); } return 0; @@ -2971,12 +3022,19 @@ static void lpuart_console_fixup(struct lpuart_port *sport) static int __maybe_unused lpuart_resume(struct device *dev) { struct lpuart_port *sport = dev_get_drvdata(dev); + int ret; if (lpuart_uport_is_active(sport)) { if (lpuart_is_32(sport)) lpuart32_hw_setup(sport); else lpuart_hw_setup(sport); + } else if (pm_runtime_active(sport->port.dev)) { + ret = lpuart_enable_clks(sport); + if (ret) + return ret; + pm_runtime_set_active(sport->port.dev); + pm_runtime_enable(sport->port.dev); } lpuart_console_fixup(sport); @@ -2986,6 +3044,8 @@ static int __maybe_unused lpuart_resume(struct device *dev) } static const struct dev_pm_ops lpuart_pm_ops = { + SET_RUNTIME_PM_OPS(lpuart_runtime_suspend, + lpuart_runtime_resume, NULL) SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(lpuart_suspend_noirq, lpuart_resume_noirq) SET_SYSTEM_SLEEP_PM_OPS(lpuart_suspend, lpuart_resume)