Commit 35781d83 authored by Aniket Randive's avatar Aniket Randive Committed by Greg Kroah-Hartman
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tty: serial: qcom-geni-serial: Add support for Hibernation feature 



Added changes to support the hibernation feature for serial UART.
Added support for freeze, restore and thaw callbacks to put the
device into hibernation.

Signed-off-by: default avatarAniket Randive <quic_arandive@quicinc.com>
Link: https://lore.kernel.org/r/1665123780-20557-1-git-send-email-quic_arandive@quicinc.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d11cc8c3

drivers/tty/serial/qcom_geni_serial.c

+35 −0
Original line number Original line Diff line number Diff line
@@ -924,6 +924,7 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport) 
			       false, true, true);

			       false, true, true);

	geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);

	geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);

	geni_se_select_mode(&port->se, GENI_SE_FIFO);

	geni_se_select_mode(&port->se, GENI_SE_FIFO);

	qcom_geni_serial_start_rx(uport);

	port->setup = true;

	port->setup = true;





	return 0;

	return 0;
@@ -1547,9 +1548,43 @@ static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev) 
	return ret;

	return ret;

}

}





static int qcom_geni_serial_sys_hib_resume(struct device *dev)

{

	int ret = 0;

	struct uart_port *uport;

	struct qcom_geni_private_data *private_data;

	struct qcom_geni_serial_port *port = dev_get_drvdata(dev);



	uport = &port->uport;

	private_data = uport->private_data;



	if (uart_console(uport)) {

		geni_icc_set_tag(&port->se, 0x7);

		geni_icc_set_bw(&port->se);

		ret = uart_resume_port(private_data->drv, uport);

		/*

		 * For hibernation usecase clients for

		 * console UART won't call port setup during restore,

		 * hence call port setup for console uart.

		 */

		qcom_geni_serial_port_setup(uport);

	} else {

		/*

		 * Peripheral register settings are lost during hibernation.

		 * Update setup flag such that port setup happens again

		 * during next session. Clients of HS-UART will close and

		 * open the port during hibernation.

		 */

		port->setup = false;

	}

	return ret;

}



static const struct dev_pm_ops qcom_geni_serial_pm_ops = {

static const struct dev_pm_ops qcom_geni_serial_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend,

	SET_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend,

					qcom_geni_serial_sys_resume)

					qcom_geni_serial_sys_resume)

	.restore = qcom_geni_serial_sys_hib_resume,

	.thaw = qcom_geni_serial_sys_hib_resume,

};

};





static const struct of_device_id qcom_geni_serial_match_table[] = {

static const struct of_device_id qcom_geni_serial_match_table[] = {