xhci: Add port status decoder for tracing purposes

Add PORTSC Port status and control register decoder to
show human readable tracing of portsc register
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci.h

@@ -2399,6 +2399,87 @@ static inline const char *xhci_decode_slot_context(u32 info, u32 info2,
 	return str;
 }
 
+
+static inline const char *xhci_portsc_link_state_string(u32 portsc)
+{
+	switch (portsc & PORT_PLS_MASK) {
+	case XDEV_U0:
+		return "U0";
+	case XDEV_U1:
+		return "U1";
+	case XDEV_U2:
+		return "U2";
+	case XDEV_U3:
+		return "U3";
+	case XDEV_DISABLED:
+		return "Disabled";
+	case XDEV_RXDETECT:
+		return "RxDetect";
+	case XDEV_INACTIVE:
+		return "Inactive";
+	case XDEV_POLLING:
+		return "Polling";
+	case XDEV_RECOVERY:
+		return "Recovery";
+	case XDEV_HOT_RESET:
+		return "Hot Reset";
+	case XDEV_COMP_MODE:
+		return "Compliance mode";
+	case XDEV_TEST_MODE:
+		return "Test mode";
+	case XDEV_RESUME:
+		return "Resume";
+	default:
+		break;
+	}
+	return "Unknown";
+}
+
+static inline const char *xhci_decode_portsc(u32 portsc)
+{
+	static char str[256];
+	int ret;
+
+	ret = sprintf(str, "%s %s %s Link:%s ",
+		      portsc & PORT_POWER	? "Powered" : "Powered-off",
+		      portsc & PORT_CONNECT	? "Connected" : "Not-connected",
+		      portsc & PORT_PE		? "Enabled" : "Disabled",
+		      xhci_portsc_link_state_string(portsc));
+
+	if (portsc & PORT_OC)
+		ret += sprintf(str + ret, "OverCurrent ");
+	if (portsc & PORT_RESET)
+		ret += sprintf(str + ret, "In-Reset ");
+
+	ret += sprintf(str + ret, "Change: ");
+	if (portsc & PORT_CSC)
+		ret += sprintf(str + ret, "CSC ");
+	if (portsc & PORT_PEC)
+		ret += sprintf(str + ret, "PEC ");
+	if (portsc & PORT_WRC)
+		ret += sprintf(str + ret, "WRC ");
+	if (portsc & PORT_OCC)
+		ret += sprintf(str + ret, "OCC ");
+	if (portsc & PORT_RC)
+		ret += sprintf(str + ret, "PRC ");
+	if (portsc & PORT_PLC)
+		ret += sprintf(str + ret, "PLC ");
+	if (portsc & PORT_CEC)
+		ret += sprintf(str + ret, "CEC ");
+	if (portsc & PORT_CAS)
+		ret += sprintf(str + ret, "CAS ");
+
+	ret += sprintf(str + ret, "Wake: ");
+	if (portsc & PORT_WKCONN_E)
+		ret += sprintf(str + ret, "WCE ");
+	if (portsc & PORT_WKDISC_E)
+		ret += sprintf(str + ret, "WDE ");
+	if (portsc & PORT_WKOC_E)
+		ret += sprintf(str + ret, "WOE ");
+
+	return str;
+}
+
 static inline const char *xhci_ep_state_string(u8 state)
 {
 	switch (state) {