usb: chipidea: udc: Support SKB alignment quirk

NVIDIA Tegra20 UDC can't cope with unaligned DMA and require a USB gadget
quirk that avoids SKB buffer alignment to be set in order to make Ethernet
Gadget working. Later Tegra generations do not require that quirk. Let's
add a new platform data flag that allows to enable USB gadget quirk for
platforms that require it.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 6502c13331e8..fe8a90543ea3 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1896,6 +1896,9 @@ static int udc_start(struct ci_hdrc *ci)
         ci->gadget.name         = ci->platdata->name;
         ci->gadget.otg_caps     = otg_caps;
 
+        if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
+                ci->gadget.quirk_avoids_skb_reserve = 1;
+
         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
                                                 otg_caps->adp_support))
                 ci->gadget.is_otg = 1;