usb: dwc3: gadget: pretty print Generic CMDs

this makes it slightly easier to read generic CMD
logs. It also helps make sure we're sending proper
parameters for each command.

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

@@ -302,6 +302,32 @@ static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
 	}
 }
 
+static const char *dwc3_gadget_generic_cmd_string(u8 cmd)
+{
+	switch (cmd) {
+	case DWC3_DGCMD_SET_LMP:
+		return "Set LMP";
+	case DWC3_DGCMD_SET_PERIODIC_PAR:
+		return "Set Periodic Parameters";
+	case DWC3_DGCMD_XMIT_FUNCTION:
+		return "Transmit Function Wake Device Notification";
+	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO:
+		return "Set Scratchpad Buffer Array Address Lo";
+	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI:
+		return "Set Scratchpad Buffer Array Address Hi";
+	case DWC3_DGCMD_SELECTED_FIFO_FLUSH:
+		return "Selected FIFO Flush";
+	case DWC3_DGCMD_ALL_FIFO_FLUSH:
+		return "All FIFO Flush";
+	case DWC3_DGCMD_SET_ENDPOINT_NRDY:
+		return "Set Endpoint NRDY";
+	case DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK:
+		return "Run SoC Bus Loopback Test";
+	default:
+		return "UNKNOWN";
+	}
+}
+
 static const char *dwc3_gadget_link_string(enum dwc3_link_state link_state)
 {
 	switch (link_state) {
@@ -343,6 +369,9 @@ int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
 	u32		timeout = 500;
 	u32		reg;
 
+	dev_vdbg(dwc->dev, "generic cmd '%s' [%d] param %08x\n",
+			dwc3_gadget_generic_cmd_string(cmd), cmd, param);
+
 	dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 	dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);