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From: Krishna Kurapati <quic_kriskura@quicinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring
	<robh@kernel.org>, Bjorn Andersson <andersson@kernel.org>,
        Wesley Cheng
	<quic_wcheng@quicinc.com>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        "Greg
 Kroah-Hartman" <gregkh@linuxfoundation.org>,
        Conor Dooley
	<conor+dt@kernel.org>,
        Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Felipe Balbi
	<balbi@kernel.org>, Johan Hovold <johan@kernel.org>
CC: <devicetree@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <quic_ppratap@quicinc.com>, <quic_jackp@quicinc.com>,
        Krishna Kurapati
	<quic_kriskura@quicinc.com>,
        Johan Hovold <johan+linaro@kernel.org>
Subject: [PATCH v20 8/9] usb: dwc3: qcom: Enable wakeup for applicable ports of multiport
Date: Mon, 8 Apr 2024 18:59:24 +0530
Message-ID: <20240408132925.1880571-9-quic_kriskura@quicinc.com>
In-Reply-To: <20240408132925.1880571-1-quic_kriskura@quicinc.com>
References: <20240408132925.1880571-1-quic_kriskura@quicinc.com>
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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>
---
 drivers/usb/dwc3/dwc3-qcom.c | 71 +++++++++++++++++++++---------------
 1 file changed, 41 insertions(+), 30 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 35eb338514bc..12182e0f8f45 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -57,6 +57,7 @@ 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 {
@@ -68,7 +69,6 @@ struct dwc3_qcom {
 	struct reset_control	*resets;
 	struct dwc3_qcom_port	ports[DWC3_MAX_PORTS];
 	u8			num_ports;
-	enum usb_device_speed	usb2_speed;
 
 	struct extcon_dev	*edev;
 	struct extcon_dev	*host_edev;
@@ -307,7 +307,7 @@ 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;
@@ -318,14 +318,8 @@ 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
@@ -356,26 +350,26 @@ 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
@@ -386,21 +380,37 @@ 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)
@@ -427,7 +437,8 @@ 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);
 	}
 
-- 
2.34.1