From 729ed6d502b45fd3b5c3b21c3ceaa63a8fe7cc43 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 30 Aug 2006 13:24:56 -0700 Subject: [PATCH] USB: ethernet gadget avoids zlps for musb_hdrc For systems using the Mentor HDRC controllers we get better TX DMA throughput if we can avoid falling back to PIO to write zero length packets ... so tell the driver to avoid ZLPs. Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/ether.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c index 1cc3c02..366dc0a 100644 --- a/drivers/usb/gadget/ether.c +++ b/drivers/usb/gadget/ether.c @@ -2230,6 +2230,9 @@ eth_bind (struct usb_gadget *gadget) if (gadget_is_pxa (gadget)) { /* pxa doesn't support altsettings */ cdc = 0; + } else if (gadget_is_musbhdrc(gadget)) { + /* reduce tx dma overhead by avoiding special cases */ + zlp = 0; } else if (gadget_is_sh(gadget)) { /* sh doesn't support multiple interfaces or configs */ cdc = 0; -- 2.7.4