[PATCH v6 3/4] 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 wakeup interrupt handling for i.MX95 to support various
wakeup events.

Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
---
Changes in v6:
 - add Ack tag
Changes in v5:
 - remove warning
 - add wakeup_irq checking
Changes in v4:
 - warning if no irq provided for imx95
Changes in v3:
 - include <linux/irq.h> to fix possible build issue
Changes in v2:
 - rename irq to wakeup_irq
 - disable irq by default
 - enable irq when suspend, disable irq when resume
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 37 ++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 1a7fc638213e..c34298ccc399 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
@@ -98,6 +99,7 @@ struct ci_hdrc_imx_data {
 	struct clk *clk;
 	struct clk *clk_wakeup;
 	struct imx_usbmisc_data *usbmisc_data;
+	int wakeup_irq;
 	bool supports_runtime_pm;
 	bool override_phy_control;
 	bool in_lpm;
@@ -336,6 +338,16 @@ 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;
+
+	disable_irq_nosync(irq);
+	pm_runtime_resume(&imx_data->ci_pdev->dev);
+
+	return IRQ_HANDLED;
+}
+
 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 {
 	struct ci_hdrc_imx_data *data;
@@ -476,6 +488,16 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 		data->supports_runtime_pm = true;
 
+	data->wakeup_irq = platform_get_irq_optional(pdev, 1);
+	if (data->wakeup_irq > 0) {
+		ret = devm_request_threaded_irq(dev, data->wakeup_irq,
+						NULL, ci_wakeup_irq_handler,
+						IRQF_ONESHOT | IRQF_NO_AUTOEN,
+						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);
@@ -584,6 +606,10 @@ static int imx_controller_suspend(struct device *dev,
 	}
 
 	imx_disable_unprepare_clks(dev);
+
+	if (data->wakeup_irq > 0)
+		enable_irq(data->wakeup_irq);
+
 	if (data->plat_data->flags & CI_HDRC_PMQOS)
 		cpu_latency_qos_remove_request(&data->pm_qos_req);
 
@@ -608,6 +634,10 @@ static int imx_controller_resume(struct device *dev,
 	if (data->plat_data->flags & CI_HDRC_PMQOS)
 		cpu_latency_qos_add_request(&data->pm_qos_req, 0);
 
+	if (data->wakeup_irq > 0 &&
+	    !irqd_irq_disabled(irq_get_irq_data(data->wakeup_irq)))
+		disable_irq_nosync(data->wakeup_irq);
+
 	ret = imx_prepare_enable_clks(dev);
 	if (ret)
 		return ret;
@@ -643,6 +673,10 @@ static int ci_hdrc_imx_suspend(struct device *dev)
 		return ret;
 
 	pinctrl_pm_select_sleep_state(dev);
+
+	if (data->wakeup_irq > 0 && device_may_wakeup(dev))
+		enable_irq_wake(data->wakeup_irq);
+
 	return ret;
 }
 
@@ -651,6 +685,9 @@ static int ci_hdrc_imx_resume(struct device *dev)
 	struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 	int ret;
 
+	if (data->wakeup_irq > 0 && device_may_wakeup(dev))
+		disable_irq_wake(data->wakeup_irq);
+
 	pinctrl_pm_select_default_state(dev);
 	ret = imx_controller_resume(dev, PMSG_RESUME);
 	if (!ret && data->supports_runtime_pm) {
-- 
2.34.1