From: Bryan Wu <bryan.wu@analog.com>
Date: Mon, 9 Aug 2010 18:58:24 +0000 (-0400)
Subject: usb: musb: only write CLRDATATOG when appropriate
X-Git-Tag: v2010.12-rc1~113^2
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=4ee691f6aced74c30bbe15d9e97313df21037ae3;p=oweals%2Fu-boot.git

usb: musb: only write CLRDATATOG when appropriate

This is a change similar to what is already in the Linux driver.  We
should only program the CLRDATATOG bit when the current mode indicates
that it is needed.

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---

diff --git a/drivers/usb/musb/musb_hcd.c b/drivers/usb/musb/musb_hcd.c
index af989aa78d..f38b279096 100644
--- a/drivers/usb/musb/musb_hcd.c
+++ b/drivers/usb/musb/musb_hcd.c
@@ -144,19 +144,28 @@ static void write_toggle(struct usb_device *dev, u8 ep, u8 dir_out)
 	u16 csr;
 
 	if (dir_out) {
-		if (!toggle)
-			writew(MUSB_TXCSR_CLRDATATOG, &musbr->txcsr);
-		else {
-			csr = readw(&musbr->txcsr);
+		csr = readw(&musbr->txcsr);
+		if (!toggle) {
+			if (csr & MUSB_TXCSR_MODE)
+				csr = MUSB_TXCSR_CLRDATATOG;
+			else
+				csr = 0;
+			writew(csr, &musbr->txcsr);
+		} else {
 			csr |= MUSB_TXCSR_H_WR_DATATOGGLE;
 			writew(csr, &musbr->txcsr);
 			csr |= (toggle << MUSB_TXCSR_H_DATATOGGLE_SHIFT);
 			writew(csr, &musbr->txcsr);
 		}
 	} else {
-		if (!toggle)
-			writew(MUSB_RXCSR_CLRDATATOG, &musbr->rxcsr);
-		else {
+		if (!toggle) {
+			csr = readw(&musbr->txcsr);
+			if (csr & MUSB_TXCSR_MODE)
+				csr = MUSB_RXCSR_CLRDATATOG;
+			else
+				csr = 0;
+			writew(csr, &musbr->rxcsr);
+		} else {
 			csr = readw(&musbr->rxcsr);
 			csr |= MUSB_RXCSR_H_WR_DATATOGGLE;
 			writew(csr, &musbr->rxcsr);