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Commit fb6dcef6 authored by Erwan Le Ray's avatar Erwan Le Ray Committed by Greg Kroah-Hartman
Browse files

serial: stm32: add pm_runtime support 



Use pm_runtime for clock management.

Signed-off-by: default avatarBich Hemon <bich.hemon@st.com>
Signed-off-by: default avatarErwan Le Ray <erwan.leray@st.com>

Link: https://lore.kernel.org/r/1560433800-12255-5-git-send-email-erwan.leray@st.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 94616d9a

drivers/tty/serial/stm32-usart.c

+38 −3
Original line number Diff line number Diff line
@@ -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)

};