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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: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Yoshihiro Shimoda 2016-08-22 17:48:28 +09:00 committed by Felipe Balbi
parent c4824f11fe
commit ee5acabf58
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/renesas_usbhs/mod_gadget.c
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@ -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);