Two changes for this v4.12-rc1:

- Add sysfs entry for role switch
 - Update gadget state after gadget back from suspend
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Merge tag 'usb-ci-v4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-next

Peter writes:

Two changes for this v4.12-rc1:
- Add sysfs entry for role switch
- Update gadget state after gadget back from suspend

Documentation/ABI/testing/sysfs-platform-chipidea-usb2

@@ -0,0 +1,9 @@
+What:		/sys/bus/platform/devices/ci_hdrc.0/role
+Date:		Mar 2017
+Contact:	Peter Chen <peter.chen@nxp.com>
+Description:
+		It returns string "gadget" or "host" when read it, it indicates
+		current controller role.
+
+		It will do role switch when write "gadget" or "host" to it.
+		Only controller at dual-role configuration supports writing.

drivers/usb/chipidea/ci.h

@@ -177,6 +177,7 @@ struct hw_bank {
  * @td_pool: allocation pool for transfer descriptors
  * @gadget: device side representation for peripheral controller
  * @driver: gadget driver
+ * @resume_state: save the state of gadget suspend from
  * @hw_ep_max: total number of endpoints supported by hardware
  * @ci_hw_ep: array of endpoints
  * @ep0_dir: ep0 direction
@@ -227,6 +228,7 @@ struct ci_hdrc {
 
 	struct usb_gadget		gadget;
 	struct usb_gadget_driver	*driver;
+	enum usb_device_state		resume_state;
 	unsigned			hw_ep_max;
 	struct ci_hw_ep			ci_hw_ep[ENDPT_MAX];
 	u32				ep0_dir;

drivers/usb/chipidea/core.c

@@ -838,6 +838,56 @@ static void ci_get_otg_capable(struct ci_hdrc *ci)
 	}
 }
 
+static ssize_t ci_role_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", ci_role(ci)->name);
+}
+
+static ssize_t ci_role_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct ci_hdrc *ci = dev_get_drvdata(dev);
+	enum ci_role role;
+	int ret;
+
+	if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
+		dev_warn(dev, "Current configuration is not dual-role, quit\n");
+		return -EPERM;
+	}
+
+	for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
+		if (!strncmp(buf, ci->roles[role]->name,
+			     strlen(ci->roles[role]->name)))
+			break;
+
+	if (role == CI_ROLE_END || role == ci->role)
+		return -EINVAL;
+
+	pm_runtime_get_sync(dev);
+	disable_irq(ci->irq);
+	ci_role_stop(ci);
+	ret = ci_role_start(ci, role);
+	if (!ret && ci->role == CI_ROLE_GADGET)
+		ci_handle_vbus_change(ci);
+	enable_irq(ci->irq);
+	pm_runtime_put_sync(dev);
+
+	return (ret == 0) ? n : ret;
+}
+static DEVICE_ATTR(role, 0644, ci_role_show, ci_role_store);
+
+static struct attribute *ci_attrs[] = {
+	&dev_attr_role.attr,
+	NULL,
+};
+
+static struct attribute_group ci_attr_group = {
+	.attrs = ci_attrs,
+};
+
 static int ci_hdrc_probe(struct platform_device *pdev)
 {
 	struct device	*dev = &pdev->dev;
@@ -1004,11 +1054,18 @@ static int ci_hdrc_probe(struct platform_device *pdev)
 		ci_hdrc_otg_fsm_start(ci);
 
 	device_set_wakeup_capable(&pdev->dev, true);
-
 	ret = dbg_create_files(ci);
-	if (!ret)
+	if (ret)
+		goto stop;
+
+	ret = sysfs_create_group(&dev->kobj, &ci_attr_group);
+	if (ret)
+		goto remove_debug;
+
 	return 0;
 
+remove_debug:
+	dbg_remove_files(ci);
 stop:
 	ci_role_destroy(ci);
 deinit_phy:
@@ -1030,6 +1087,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
 	}
 
 	dbg_remove_files(ci);
+	sysfs_remove_group(&ci->dev->kobj, &ci_attr_group);
 	ci_role_destroy(ci);
 	ci_hdrc_enter_lpm(ci, true);
 	ci_usb_phy_exit(ci);

drivers/usb/chipidea/udc.c

@@ -1847,27 +1847,32 @@ static irqreturn_t udc_irq(struct ci_hdrc *ci)
 		if (USBi_PCI & intr) {
 			ci->gadget.speed = hw_port_is_high_speed(ci) ?
 				USB_SPEED_HIGH : USB_SPEED_FULL;
-			if (ci->suspended && ci->driver->resume) {
+			if (ci->suspended) {
+				if (ci->driver->resume) {
 					spin_unlock(&ci->lock);
 					ci->driver->resume(&ci->gadget);
 					spin_lock(&ci->lock);
+				}
 				ci->suspended = 0;
+				usb_gadget_set_state(&ci->gadget,
+						ci->resume_state);
 			}
 		}
 
 		if (USBi_UI  & intr)
 			isr_tr_complete_handler(ci);
 
-		if (USBi_SLI & intr) {
+		if ((USBi_SLI & intr) && !(ci->suspended)) {
+			ci->suspended = 1;
+			ci->resume_state = ci->gadget.state;
 			if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
 			    ci->driver->suspend) {
-				ci->suspended = 1;
 				spin_unlock(&ci->lock);
 				ci->driver->suspend(&ci->gadget);
-				usb_gadget_set_state(&ci->gadget,
-						USB_STATE_SUSPENDED);
 				spin_lock(&ci->lock);
 			}
+			usb_gadget_set_state(&ci->gadget,
+					USB_STATE_SUSPENDED);
 		}
 		retval = IRQ_HANDLED;
 	} else {
@@ -1975,6 +1980,8 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci)
 	 */
 	if (ci->is_otg)
 		hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
+
+	ci->vbus_active = 0;
 }
 
 /**