4 files changed, 11 insertions, 19 deletions

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index d2e6fdb25e28..054e59ca6946 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1029,20 +1029,12 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
         dev->mii.phy_id = 0x03;
         dev->mii.supports_gmii = 1;
 
-        if (usb_device_no_sg_constraint(dev->udev))
-                dev->can_dma_sg = 1;
-
         dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                               NETIF_F_RXCSUM;
 
         dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                                  NETIF_F_RXCSUM;
 
-        if (dev->can_dma_sg) {
-                dev->net->features |= NETIF_F_SG | NETIF_F_TSO;
-                dev->net->hw_features |= NETIF_F_SG | NETIF_F_TSO;
-        }
-
         /* Enable checksum offload */
         *tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
                AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 8d72f0c65937..062967c90b2a 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -717,6 +717,10 @@ int usb_get_configuration(struct usb_device *dev)
                         result = -ENOMEM;
                         goto err;
                 }
+
+                if (dev->quirks & USB_QUIRK_DELAY_INIT)
+                        msleep(100);
+
                 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
                     bigbuffer, length);
                 if (result < 0) {
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 8f37063c0a49..739ee8e8bdfd 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -47,6 +47,10 @@ static const struct usb_device_id usb_quirk_list[] = {
         /* Microsoft LifeCam-VX700 v2.0 */
         { USB_DEVICE(0x045e, 0x0770), .driver_info = USB_QUIRK_RESET_RESUME },
 
+        /* Logitech HD Pro Webcams C920 and C930e */
+        { USB_DEVICE(0x046d, 0x082d), .driver_info = USB_QUIRK_DELAY_INIT },
+        { USB_DEVICE(0x046d, 0x0843), .driver_info = USB_QUIRK_DELAY_INIT },
+
         /* Logitech Quickcam Fusion */
         { USB_DEVICE(0x046d, 0x08c1), .driver_info = USB_QUIRK_RESET_RESUME },
 
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 6fe577d46fa2..924a6ccdb622 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4733,6 +4733,9 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
         /* Accept arbitrarily long scatter-gather lists */
         hcd->self.sg_tablesize = ~0;
 
+        /* support to build packet from discontinuous buffers */
+        hcd->self.no_sg_constraint = 1;
+
         /* XHCI controllers don't stop the ep queue on short packets :| */
         hcd->self.no_stop_on_short = 1;
 
@@ -4757,14 +4760,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
                 /* xHCI private pointer was set in xhci_pci_probe for the second
                  * registered roothub.
                  */
-                xhci = hcd_to_xhci(hcd);
-                /*
-                 * Support arbitrarily aligned sg-list entries on hosts without
-                 * TD fragment rules (which are currently unsupported).
-                 */
-                if (xhci->hci_version < 0x100)
-                        hcd->self.no_sg_constraint = 1;
-
                 return 0;
         }
 
@@ -4793,9 +4788,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
         if (xhci->hci_version > 0x96)
                 xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
 
-        if (xhci->hci_version < 0x100)
-                hcd->self.no_sg_constraint = 1;
-
         /* Make sure the HC is halted. */
         retval = xhci_halt(xhci);
         if (retval)