Commit 8b7103f3 authored by Akash Asthana's avatar Akash Asthana Committed by Greg Kroah-Hartman
Browse files

tty: serial: qcom_geni_serial: Wakeup over UART RX 



Add system wakeup capability over UART RX line for wakeup capable UART.
When system is suspended, RX line act as an interrupt to wakeup system
for any communication requests from peer.

Signed-off-by: default avatarAkash Asthana <akashast@codeaurora.org>
Link: https://lore.kernel.org/r/1570700803-17566-1-git-send-email-akashast@codeaurora.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3e4aaea7

drivers/tty/serial/qcom_geni_serial.c

+43 −1
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_wakeirq.h>

#include <linux/qcom-geni-se.h>

#include <linux/serial.h>

#include <linux/serial_core.h>
@@ -116,6 +117,7 @@ struct qcom_geni_serial_port { 
	bool brk;



	unsigned int tx_remaining;

	int wakeup_irq;

};



static const struct uart_ops qcom_geni_console_pops;
@@ -755,6 +757,15 @@ out_write_wakeup: 
		uart_write_wakeup(uport);

}



static irqreturn_t qcom_geni_serial_wakeup_isr(int isr, void *dev)

{

	struct uart_port *uport = dev;



	pm_wakeup_event(uport->dev, 2000);



	return IRQ_HANDLED;

}



static irqreturn_t qcom_geni_serial_isr(int isr, void *dev)

{

	u32 m_irq_en;
@@ -1306,6 +1317,29 @@ static int qcom_geni_serial_probe(struct platform_device *pdev) 
		return ret;

	}



	if (!console) {

		port->wakeup_irq = platform_get_irq(pdev, 1);

		if (port->wakeup_irq < 0) {

			dev_err(&pdev->dev, "Failed to get wakeup IRQ %d\n",

					port->wakeup_irq);

		} else {

			irq_set_status_flags(port->wakeup_irq, IRQ_NOAUTOEN);

			ret = devm_request_irq(uport->dev, port->wakeup_irq,

				qcom_geni_serial_wakeup_isr,

				IRQF_TRIGGER_FALLING, "uart_wakeup", uport);

			if (ret) {

				dev_err(uport->dev, "Failed to register wakeup IRQ ret %d\n",

						ret);

				return ret;

			}



			device_init_wakeup(&pdev->dev, true);

			ret = dev_pm_set_wake_irq(&pdev->dev, port->wakeup_irq);

			if (unlikely(ret))

				dev_err(uport->dev, "%s:Failed to set IRQ wake:%d\n",

						__func__, ret);

		}

	}

	uport->private_data = drv;

	platform_set_drvdata(pdev, port);

	port->handle_rx = console ? handle_rx_console : handle_rx_uart;
@@ -1328,7 +1362,12 @@ static int __maybe_unused qcom_geni_serial_sys_suspend(struct device *dev) 
	struct qcom_geni_serial_port *port = dev_get_drvdata(dev);

	struct uart_port *uport = &port->uport;



	return uart_suspend_port(uport->private_data, uport);

	uart_suspend_port(uport->private_data, uport);



	if (port->wakeup_irq > 0)

		enable_irq(port->wakeup_irq);



	return 0;

}



static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev)
@@ -1336,6 +1375,9 @@ static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev) 
	struct qcom_geni_serial_port *port = dev_get_drvdata(dev);

	struct uart_port *uport = &port->uport;



	if (port->wakeup_irq > 0)

		disable_irq(port->wakeup_irq);



	return uart_resume_port(uport->private_data, uport);

}

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