usb: dwc3: gadget: improve gcmd trace

Just like we did for endpoint commands, let's have a
single trace output for the command and its
status. This will improve trace readability

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/debug.h

@@ -296,6 +296,20 @@ static inline const char *dwc3_ep_cmd_status_string(int status)
 	}
 }
 
+static inline const char *dwc3_gadget_generic_cmd_status_string(int status)
+{
+	switch (status) {
+	case -ETIMEDOUT:
+		return "Timed Out";
+	case 0:
+		return "Successful";
+	case 1:
+		return "Error";
+	default:
+		return "UNKNOWN";
+	}
+}
+
 void dwc3_trace(void (*trace)(struct va_format *), const char *fmt, ...);
 
 #ifdef CONFIG_DEBUG_FS

drivers/usb/dwc3/gadget.c

@@ -207,32 +207,30 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 {
 	u32		timeout = 500;
+	int		status = 0;
 	int		ret = 0;
 	u32		reg;
 
-	trace_dwc3_gadget_generic_cmd(cmd, param);
-
 	dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 	dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 
 	do {
 		reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 		if (!(reg & DWC3_DGCMD_CMDACT)) {
-			dwc3_trace(trace_dwc3_gadget,
-					"Command Complete --> %d",
-					DWC3_DGCMD_STATUS(reg));
-			if (DWC3_DGCMD_STATUS(reg))
+			status = DWC3_DGCMD_STATUS(reg);
+			if (status)
 				ret = -EINVAL;
 			break;
 		}
 	} while (timeout--);
 
 	if (!timeout) {
-		dwc3_trace(trace_dwc3_gadget,
-				"Command Timed Out");
 		ret = -ETIMEDOUT;
+		status = -ETIMEDOUT;
 	}
 
+	trace_dwc3_gadget_generic_cmd(cmd, param, status);
+
 	return ret;
 }
 

drivers/usb/dwc3/trace.h

@@ -167,25 +167,28 @@ DEFINE_EVENT(dwc3_log_request, dwc3_gadget_giveback,
 );
 
 DECLARE_EVENT_CLASS(dwc3_log_generic_cmd,
-	TP_PROTO(unsigned int cmd, u32 param),
-	TP_ARGS(cmd, param),
+	TP_PROTO(unsigned int cmd, u32 param, int status),
+	TP_ARGS(cmd, param, status),
 	TP_STRUCT__entry(
 		__field(unsigned int, cmd)
 		__field(u32, param)
+		__field(int, status)
 	),
 	TP_fast_assign(
 		__entry->cmd = cmd;
 		__entry->param = param;
+		__entry->status = status;
 	),
-	TP_printk("cmd '%s' [%d] param %08x",
+	TP_printk("cmd '%s' [%d] param %08x --> status: %s",
 		dwc3_gadget_generic_cmd_string(__entry->cmd),
-		__entry->cmd, __entry->param
+		__entry->cmd, __entry->param,
+		dwc3_gadget_generic_cmd_status_string(__entry->status)
 	)
 );
 
 DEFINE_EVENT(dwc3_log_generic_cmd, dwc3_gadget_generic_cmd,
-	TP_PROTO(unsigned int cmd, u32 param),
-	TP_ARGS(cmd, param)
+	TP_PROTO(unsigned int cmd, u32 param, int status),
+	TP_ARGS(cmd, param, status)
 );
 
 DECLARE_EVENT_CLASS(dwc3_log_gadget_ep_cmd,