@@ -584,6 +584,13 @@ static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
*/
ecm->port.is_zlp_ok =
gadget_is_zlp_supported(cdev->gadget);
+
+ /* Setup DMA alignment workaround for UDC's that
+ * need it.
+ */
+ ecm->port.no_skb_reserve =
+ gadget_avoids_skb_reserve(cdev->gadget);
+
ecm->port.cdc_filter = DEFAULT_FILTER;
DBG(cdev, "activate ecm\n");
net = gether_connect(&ecm->port);
@@ -215,6 +215,11 @@ static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
*/
eem->port.is_zlp_ok = 1;
eem->port.cdc_filter = DEFAULT_FILTER;
+
+ /* setup DMA alignment workaround for UDC's that*need it */
+ eem->port.no_skb_reserve =
+ gadget_avoids_skb_reserve(cdev->gadget);
+
DBG(cdev, "activate eem\n");
net = gether_connect(&eem->port);
if (IS_ERR(net))
@@ -593,6 +593,10 @@ static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
*/
rndis->port.cdc_filter = 0;
+ /* Setup DMA alignment workaround for UDC's that need it */
+ rndis->port.no_skb_reserve =
+ gadget_avoids_skb_reserve(cdev->gadget);
+
DBG(cdev, "RNDIS RX/TX early activation ... \n");
net = gether_connect(&rndis->port);
if (IS_ERR(net))
This quirk is required to make USB Ethernet gadget working with HW that can't cope with unaligned DMA. For some reason only f_ncm handles that quirk, let's handle it in the rest of the network models. All models have been tested with a ChipIdea UDC driver on NVIDIA Tegra20 SoC that require DMA to be aligned. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/usb/gadget/function/f_ecm.c | 7 +++++++ drivers/usb/gadget/function/f_eem.c | 5 +++++ drivers/usb/gadget/function/f_rndis.c | 4 ++++ 3 files changed, 16 insertions(+)