From: Yoshihiro Shimoda Date: Mon, 22 Aug 2016 08:48:28 +0000 (+0900) Subject: usb: renesas_usbhs: set quirk_avoids_skb_reserve if USB-DMAC is used X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=ee5acabf5805612c72084276e0c215367a042d71;p=deliverable%2Flinux.git 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 Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c index 8e326ac00c9f..5732998de92a 100644 --- a/drivers/usb/renesas_usbhs/mod_gadget.c +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -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);