On 06.07.2017 04:12, Peter Chen wrote: > On Wed, Jul 05, 2017 at 08:19:50PM +0300, Dmitry Osipenko wrote: >> 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 | 2 ++ >> drivers/usb/gadget/function/f_eem.c | 2 ++ >> drivers/usb/gadget/function/f_rndis.c | 4 ++++ >> 3 files changed, 8 insertions(+) >> >> diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c >> index 4c488d15b6f6..01150f7864c7 100644 >> --- a/drivers/usb/gadget/function/f_ecm.c >> +++ b/drivers/usb/gadget/function/f_ecm.c >> @@ -584,6 +584,8 @@ static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) >> */ >> ecm->port.is_zlp_ok = >> gadget_is_zlp_supported(cdev->gadget); >> + 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..3b70b9ccfd2d 100644 >> --- a/drivers/usb/gadget/function/f_eem.c >> +++ b/drivers/usb/gadget/function/f_eem.c >> @@ -215,6 +215,8 @@ 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; >> + 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); >> + > > You may add above comments for other two changes. > Yeah, but I haven't added a comment there for consistency. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
