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@xxxxxxxxx> --- 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(+) diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c index 4c488d15b6f6..1d198055fd74 100644 --- a/drivers/usb/gadget/function/f_ecm.c +++ b/drivers/usb/gadget/function/f_ecm.c @@ -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); diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c index 007ec6e4a5d4..74e2453d8ac5 100644 --- a/drivers/usb/gadget/function/f_eem.c +++ b/drivers/usb/gadget/function/f_eem.c @@ -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)) diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c index 16562e461121..1b379c051a84 100644 --- a/drivers/usb/gadget/function/f_rndis.c +++ b/drivers/usb/gadget/function/f_rndis.c @@ -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)) -- 2.13.3 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
