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Commit ee5acabf authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Felipe Balbi
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usb: renesas_usbhs: set quirk_avoids_skb_reserve if USB-DMAC is used 



This patch sets the quirk_avoids_skb_reserve flag to improve performance
of a network gadget driver (e.g. f_ncm.c) if USB-DMAC is used.

For example (on r8a7795 board + f_ncm.c + iperf udp mode / receiving):
  - without this patch:  90.3 Mbits/sec
  - with    this patch: 273   Mbits/sec

Signed-off-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent c4824f11

drivers/usb/renesas_usbhs/mod_gadget.c

+2 −0
Original line number Diff line number Diff line
@@ -1102,6 +1102,8 @@ int usbhs_mod_gadget_probe(struct usbhs_priv *priv) 
	gpriv->gadget.name		= "renesas_usbhs_udc";

	gpriv->gadget.ops		= &usbhsg_gadget_ops;

	gpriv->gadget.max_speed		= USB_SPEED_HIGH;

	gpriv->gadget.quirk_avoids_skb_reserve = usbhs_get_dparam(priv,

								has_usb_dmac);



	INIT_LIST_HEAD(&gpriv->gadget.ep_list);