usb: renesas_usbhs: set quirk_avoids_skb_reserve if USB-DMAC is used

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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>

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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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drivers/usb/renesas_usbhs/mod_gadget.c

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