dmesg

[   56.815142] dwc2 ff300000.usb: bound driver g_serial
[   56.815153] dwc2 ff300000.usb: dwc2_hsotg_pullup: is_on: 1 op_state: 9
[   56.815164] dwc2 ff300000.usb:  --- SIMONL --- in host mode, return early from dwc2_hsotg_pullup


---

op_state: 9 -> OTG_STATE_A_HOST

gadget.c

static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on)
{
	struct dwc2_hsotg *hsotg = to_hsotg(gadget);
	unsigned long flags;

	dev_dbg(hsotg->dev, "%s: is_on: %d op_state: %d\n", __func__, is_on,
		hsotg->op_state);

	/* Don't modify pullup state while in host mode */
	if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) {
		dev_dbg(hsotg->dev, " --- SIMONL --- in host mode, return early from dwc2_hsotg_pullup \n");
		hsotg->enabled = is_on;
		return 0;
	}

	spin_lock_irqsave(&hsotg->lock, flags);
	if (is_on) {
		hsotg->enabled = 1;
		dwc2_hsotg_core_init_disconnected(hsotg, false);
		/* Enable ACG feature in device mode,if supported */
		dwc2_enable_acg(hsotg);
		dwc2_hsotg_core_connect(hsotg);
	} else {
		dwc2_hsotg_core_disconnect(hsotg);
		dwc2_hsotg_disconnect(hsotg);
		hsotg->enabled = 0;
	}

	hsotg->gadget.speed = USB_SPEED_UNKNOWN;
	spin_unlock_irqrestore(&hsotg->lock, flags);

	return 0;
}