From: Ming Lei <tom.leiming@gmail.com>
Date: Mon, 20 Sep 2010 07:32:03 +0000 (+0300)
Subject: usb: musb: gadget: enable autoclear for OUT transfer in both DMA 0 and DMA 1
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=490e5fbe8ccb198fb719ae49eaa0c7071273e016;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

usb: musb: gadget: enable autoclear for OUT transfer in both DMA 0 and DMA 1

This patch fixes one bugs of OUT transfer in double buffer case:

	-the current code only enable autoclear for dma mode 1, and not
	for dma mode 0

Without this patch, test #5 of usbtest can't be passed if we
configure musb as g_zero and use fifo mode 3 to enable double
buffer mode.

With this patch and the following patch(fix dma length),
on my beagle B5, test#5(queued bulk out) may go beyond
18Mbyte/s(seems dma mode 0 is quicker in double buffer case)
if musb is configured as g_zero and fifo mode 3 is taken, follows
the test command:

    #./testusb -D DEV_NAME -c 1024 -t 5 -s 32768 -g 8   [1]

Also I have tested this patch can't make g_ether broken.

[1],source of testusb : tools/usb/testusb.c under linux kernel;

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Anand Gadiyar <gadiyar@ti.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index f206c94b8b1..176e1276dc2 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -643,8 +643,8 @@ static void rxstate(struct musb *musb, struct musb_request *req)
 	 */
 
 				csr |= MUSB_RXCSR_DMAENAB;
-#ifdef USE_MODE1
 				csr |= MUSB_RXCSR_AUTOCLEAR;
+#ifdef USE_MODE1
 				/* csr |= MUSB_RXCSR_DMAMODE; */
 
 				/* this special sequence (enabling and then