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 <dig...@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(+)
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
--
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