usb: gadget: pch_udc: Fix USB suspend issue

commit 84566abba058b2aae8d603dfa90b5a3778a6714f upstream.

ISSUE:
After USB Suspend, a system rarely freezes.

CAUSE:
When USB Suspend occurred, the driver is not notifying
a gadget of the event.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 62cc6ab90fd4094e8e6f28c9c333e4c78dd1ad4f..db4b322e5419606632f643f093901e4def565b5d 100644 (file)
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2476,8 +2476,15 @@ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr)
        if (dev_intr & UDC_DEVINT_SC)
                pch_udc_svc_cfg_interrupt(dev);
        /* USB Suspend interrupt */
-       if (dev_intr & UDC_DEVINT_US)
+       if (dev_intr & UDC_DEVINT_US) {
+               if (dev->driver
+                       && dev->driver->suspend) {
+                       spin_unlock(&dev->lock);
+                       dev->driver->suspend(&dev->gadget);
+                       spin_lock(&dev->lock);
+               }
                dev_dbg(&dev->pdev->dev, "USB_SUSPEND\n");
+       }
        /* Clear the SOF interrupt, if enabled */
        if (dev_intr & UDC_DEVINT_SOF)
                dev_dbg(&dev->pdev->dev, "SOF\n");