From fb6dcef62d52fe76f6b369e6af093dc4ad5db407 Mon Sep 17 00:00:00 2001 From: Erwan Le Ray Date: Thu, 13 Jun 2019 15:49:54 +0200 Subject: serial: stm32: add pm_runtime support Use pm_runtime for clock management. Signed-off-by: Bich Hemon Signed-off-by: Erwan Le Ray Link: https://lore.kernel.org/r/1560433800-12255-5-git-send-email-erwan.leray@st.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/stm32-usart.c | 41 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 7bb2bb9fffbc..6ddc6b08b29a 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -882,13 +882,13 @@ static void stm32_pm(struct uart_port *port, unsigned int state, switch (state) { case UART_PM_STATE_ON: - clk_prepare_enable(stm32port->clk); + pm_runtime_get_sync(port->dev); break; case UART_PM_STATE_OFF: spin_lock_irqsave(&port->lock, flags); stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit)); spin_unlock_irqrestore(&port->lock, flags); - clk_disable_unprepare(stm32port->clk); + pm_runtime_put_sync(port->dev); break; } } @@ -1186,6 +1186,11 @@ static int stm32_serial_probe(struct platform_device *pdev) platform_set_drvdata(pdev, &stm32port->port); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + return 0; err_wirq: @@ -1207,6 +1212,9 @@ static int stm32_serial_remove(struct platform_device *pdev) struct uart_port *port = platform_get_drvdata(pdev); struct stm32_port *stm32_port = to_stm32_port(port); struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; + int err; + + pm_runtime_get_sync(&pdev->dev); stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR); @@ -1235,7 +1243,12 @@ static int stm32_serial_remove(struct platform_device *pdev) clk_disable_unprepare(stm32_port->clk); - return uart_remove_one_port(&stm32_usart_driver, port); + err = uart_remove_one_port(&stm32_usart_driver, port); + + pm_runtime_disable(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + + return err; } @@ -1392,7 +1405,29 @@ static int stm32_serial_resume(struct device *dev) } #endif /* CONFIG_PM_SLEEP */ +static int __maybe_unused stm32_serial_runtime_suspend(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct stm32_port *stm32port = container_of(port, + struct stm32_port, port); + + clk_disable_unprepare(stm32port->clk); + + return 0; +} + +static int __maybe_unused stm32_serial_runtime_resume(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct stm32_port *stm32port = container_of(port, + struct stm32_port, port); + + return clk_prepare_enable(stm32port->clk); +} + static const struct dev_pm_ops stm32_serial_pm_ops = { + SET_RUNTIME_PM_OPS(stm32_serial_runtime_suspend, + stm32_serial_runtime_resume, NULL) SET_SYSTEM_SLEEP_PM_OPS(stm32_serial_suspend, stm32_serial_resume) }; -- cgit v1.2.3