[PATCH 3/6] usb: chipidea: imx: add wakeup interrupt handling

[Xu Yang <xu.yang_2@nxp.com>]

In previous imx platform, normal USB controller interrupt and wakeup
interrupt are bound to one irq line. However, it changes on latest
i.MX95 platform since it has a dedicated irq line for wakeup interrupt.
This will add wakup interrupt handling for i.MX95 to support various
wakeup events.

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 42 ++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 1a7fc638213e..5779568ebcf6 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -98,9 +98,12 @@ struct ci_hdrc_imx_data {
 	struct clk *clk;
 	struct clk *clk_wakeup;
 	struct imx_usbmisc_data *usbmisc_data;
+	/* wakeup interrupt*/
+	int irq;
 	bool supports_runtime_pm;
 	bool override_phy_control;
 	bool in_lpm;
+	bool wakeup_pending;
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *pinctrl_hsic_active;
 	struct regulator *hsic_pad_regulator;
@@ -336,6 +339,24 @@ static int ci_hdrc_imx_notify_event(struct ci_hdrc *ci, unsigned int event)
 	return ret;
 }
 
+static irqreturn_t ci_wakeup_irq_handler(int irq, void *data)
+{
+	struct ci_hdrc_imx_data *imx_data = data;
+
+	if (imx_data->in_lpm) {
+		if (imx_data->wakeup_pending)
+			return IRQ_HANDLED;
+
+		disable_irq_nosync(irq);
+		imx_data->wakeup_pending = true;
+		pm_runtime_resume(&imx_data->ci_pdev->dev);
+
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 {
 	struct ci_hdrc_imx_data *data;
@@ -476,6 +497,15 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 		data->supports_runtime_pm = true;
 
+	data->irq = platform_get_irq_optional(pdev, 1);
+	if (data->irq > 0) {
+		ret = devm_request_threaded_irq(dev, data->irq,
+				NULL, ci_wakeup_irq_handler,
+				IRQF_ONESHOT, pdata.name, data);
+		if (ret)
+			goto err_clk;
+	}
+
 	ret = imx_usbmisc_init(data->usbmisc_data);
 	if (ret) {
 		dev_err(dev, "usbmisc init failed, ret=%d\n", ret);
@@ -621,6 +651,11 @@ static int imx_controller_resume(struct device *dev,
 		goto clk_disable;
 	}
 
+	if (data->wakeup_pending) {
+		data->wakeup_pending = false;
+		enable_irq(data->irq);
+	}
+
 	return 0;
 
 clk_disable:
@@ -643,6 +678,10 @@ static int ci_hdrc_imx_suspend(struct device *dev)
 		return ret;
 
 	pinctrl_pm_select_sleep_state(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(data->irq);
+
 	return ret;
 }
 
@@ -651,6 +690,9 @@ static int ci_hdrc_imx_resume(struct device *dev)
 	struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 	int ret;
 
+	if (device_may_wakeup(dev))
+		disable_irq_wake(data->irq);
+
 	pinctrl_pm_select_default_state(dev);
 	ret = imx_controller_resume(dev, PMSG_RESUME);
 	if (!ret && data->supports_runtime_pm) {
-- 
2.34.1