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authorBryan Wu <bryan.wu@analog.com>2010-08-09 14:58:24 -0400
committerRemy Bohmer <linux@bohmer.net>2010-10-13 12:08:43 +0200
commit4ee691f6aced74c30bbe15d9e97313df21037ae3 (patch)
tree7f2fefb3c4f13f8e3115c08262f3c5de9ae7fc8d /drivers/usb
parent99e9ed1f49b31cc7c3b8f5d2c322b2eb26dd2a29 (diff)
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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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb/musb_hcd.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/usb/musb/musb_hcd.c b/drivers/usb/musb/musb_hcd.c
index af989aa..f38b279 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);