usb: dwc3: qcom: Enable wakeup for applicable ports of multiport

DWC3 Qcom wrapper currently supports only wakeup configuration
for single port controllers. Read speed of each port connected
to the controller and enable wakeup for each of them accordingly.
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20240420044901.884098-9-quic_kriskura@quicinc.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/dwc3-qcom.c

@@ -60,6 +60,7 @@ struct dwc3_qcom_port {
 	int			dp_hs_phy_irq;
 	int			dm_hs_phy_irq;
 	int			ss_phy_irq;
+	enum usb_device_speed	usb2_speed;
 };
 
 struct dwc3_qcom {
@@ -71,7 +72,6 @@ struct dwc3_qcom {
 	struct reset_control	*resets;
 	struct dwc3_qcom_port	ports[DWC3_QCOM_MAX_PORTS];
 	u8			num_ports;
-	enum usb_device_speed	usb2_speed;
 
 	struct extcon_dev	*edev;
 	struct extcon_dev	*host_edev;
@@ -310,7 +310,7 @@ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom)
 	return dwc->xhci;
 }
 
-static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
+static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom, int port_index)
 {
 	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
 	struct usb_device *udev;
@@ -321,14 +321,8 @@ static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
 	 */
 	hcd = platform_get_drvdata(dwc->xhci);
 
-	/*
-	 * It is possible to query the speed of all children of
-	 * USB2.0 root hub via usb_hub_for_each_child(). DWC3 code
-	 * currently supports only 1 port per controller. So
-	 * this is sufficient.
-	 */
 #ifdef CONFIG_USB
-	udev = usb_hub_find_child(hcd->self.root_hub, 1);
+	udev = usb_hub_find_child(hcd->self.root_hub, port_index + 1);
 #else
 	udev = NULL;
 #endif
@@ -359,26 +353,26 @@ static void dwc3_qcom_disable_wakeup_irq(int irq)
 	disable_irq_nosync(irq);
 }
 
-static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
+static void dwc3_qcom_disable_port_interrupts(struct dwc3_qcom_port *port)
 {
-	dwc3_qcom_disable_wakeup_irq(qcom->ports[0].qusb2_phy_irq);
+	dwc3_qcom_disable_wakeup_irq(port->qusb2_phy_irq);
 
-	if (qcom->usb2_speed == USB_SPEED_LOW) {
-		dwc3_qcom_disable_wakeup_irq(qcom->ports[0].dm_hs_phy_irq);
-	} else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
-			(qcom->usb2_speed == USB_SPEED_FULL)) {
-		dwc3_qcom_disable_wakeup_irq(qcom->ports[0].dp_hs_phy_irq);
+	if (port->usb2_speed == USB_SPEED_LOW) {
+		dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
+	} else if ((port->usb2_speed == USB_SPEED_HIGH) ||
+			(port->usb2_speed == USB_SPEED_FULL)) {
+		dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
 	} else {
-		dwc3_qcom_disable_wakeup_irq(qcom->ports[0].dp_hs_phy_irq);
-		dwc3_qcom_disable_wakeup_irq(qcom->ports[0].dm_hs_phy_irq);
+		dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
+		dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
 	}
 
-	dwc3_qcom_disable_wakeup_irq(qcom->ports[0].ss_phy_irq);
+	dwc3_qcom_disable_wakeup_irq(port->ss_phy_irq);
 }
 
-static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
+static void dwc3_qcom_enable_port_interrupts(struct dwc3_qcom_port *port)
 {
-	dwc3_qcom_enable_wakeup_irq(qcom->ports[0].qusb2_phy_irq, 0);
+	dwc3_qcom_enable_wakeup_irq(port->qusb2_phy_irq, 0);
 
 	/*
 	 * Configure DP/DM line interrupts based on the USB2 device attached to
@@ -389,21 +383,37 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
 	 * DP and DM lines as rising edge to detect HS/HS/LS device connect scenario.
 	 */
 
-	if (qcom->usb2_speed == USB_SPEED_LOW) {
-		dwc3_qcom_enable_wakeup_irq(qcom->ports[0].dm_hs_phy_irq,
+	if (port->usb2_speed == USB_SPEED_LOW) {
+		dwc3_qcom_enable_wakeup_irq(port->dm_hs_phy_irq,
 					    IRQ_TYPE_EDGE_FALLING);
-	} else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
-			(qcom->usb2_speed == USB_SPEED_FULL)) {
-		dwc3_qcom_enable_wakeup_irq(qcom->ports[0].dp_hs_phy_irq,
+	} else if ((port->usb2_speed == USB_SPEED_HIGH) ||
+			(port->usb2_speed == USB_SPEED_FULL)) {
+		dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
 					    IRQ_TYPE_EDGE_FALLING);
 	} else {
-		dwc3_qcom_enable_wakeup_irq(qcom->ports[0].dp_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
 					    IRQ_TYPE_EDGE_RISING);
-		dwc3_qcom_enable_wakeup_irq(qcom->ports[0].dm_hs_phy_irq,
+		dwc3_qcom_enable_wakeup_irq(port->dm_hs_phy_irq,
 					    IRQ_TYPE_EDGE_RISING);
 	}
 
-	dwc3_qcom_enable_wakeup_irq(qcom->ports[0].ss_phy_irq, 0);
+	dwc3_qcom_enable_wakeup_irq(port->ss_phy_irq, 0);
+}
+
+static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
+{
+	int i;
+
+	for (i = 0; i < qcom->num_ports; i++)
+		dwc3_qcom_disable_port_interrupts(&qcom->ports[i]);
+}
+
+static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
+{
+	int i;
+
+	for (i = 0; i < qcom->num_ports; i++)
+		dwc3_qcom_enable_port_interrupts(&qcom->ports[i]);
 }
 
 static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
@@ -430,7 +440,8 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 	 * freezable workqueue.
 	 */
 	if (dwc3_qcom_is_host(qcom) && wakeup) {
-		qcom->usb2_speed = dwc3_qcom_read_usb2_speed(qcom);
+		for (i = 0; i < qcom->num_ports; i++)
+			qcom->ports[i].usb2_speed = dwc3_qcom_read_usb2_speed(qcom, i);
 		dwc3_qcom_enable_interrupts(qcom);
 	}