@@ -37,6 +37,23 @@ Optional properties:
  - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal
 			utmi_l1_suspend_n, false when asserts utmi_sleep_n
  - snps,hird-threshold: HIRD threshold
+ - snps,has_suspend_on_disconnect: true when IP is configured in silicon with
+			DWC_USB3_SUSPEND_ON_DISCONNECT_EN=1, it can inject a
+			specific quirk to prevent xhci host controller from
+			dying when usb device is disconnected from root hub.
+			Since DWC_USB3_SUSPEND_ON_DISCONNECT_EN is an IP
+			configuration whose state cannot be checked from
+			software in runtime, it has to be enabled via platform
+			data or device tree.
+
+			xhci host dying symptom here is caused by that
+			DWC_USB3_SUSPEND_ON_DISCONNECT_EN=1
+			configuration makes IP auto-suspended after PORTCSC is
+			cleared when usb device detached, then an asynchronous
+			disconnection procedure might fail using endpoint
+			command that suspened IP won't have any response to.
+
+			this issue is fixed when IP version >= 3.00a.
 
 This is usually a subnode to DWC3 glue to which it is connected.
 

@@ -838,6 +838,9 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,tx_de_emphasis_quirk");
 		of_property_read_u8(node, "snps,tx_de_emphasis",
 				&tx_de_emphasis);
+
+		dwc->suspend_on_disconnect_quirk = of_property_read_bool(node,
+				"snps,has_suspend_on_disconnect");
 	} else if (pdata) {
 		dwc->maximum_speed = pdata->maximum_speed;
 		dwc->has_lpm_erratum = pdata->has_lpm_erratum;

@@ -864,6 +867,9 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->tx_de_emphasis_quirk = pdata->tx_de_emphasis_quirk;
 		if (pdata->tx_de_emphasis)
 			tx_de_emphasis = pdata->tx_de_emphasis;
+
+		dwc->suspend_on_disconnect_quirk =
+			pdata->has_suspend_on_disconnect;
 	}
 
 	/* default to superspeed if no maximum_speed passed */

@@ -832,6 +832,7 @@ struct dwc3 {
 
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
+	unsigned		suspend_on_disconnect_quirk:1;
 };
 
 /* -------------------------------------------------------------------------- */

@@ -53,6 +53,10 @@ int dwc3_host_init(struct dwc3 *dwc)
 	pdata.usb3_lpm_capable = 1;
 #endif
 
+	if ((dwc->revision < DWC3_REVISION_300A) &&
+	    dwc->suspend_on_disconnect_quirk)
+		pdata.delay_portcsc_clear = 1;
+
 	ret = platform_device_add_data(xhci, &pdata, sizeof(pdata));
 	if (ret) {
 		dev_err(dwc->dev, "couldn't add platform data to xHCI device\n");

@@ -44,4 +44,5 @@ struct dwc3_platform_data {
 
 	unsigned tx_de_emphasis_quirk:1;
 	unsigned tx_de_emphasis:2;
+	unsigned has_suspend_on_disconnect:1;
 };