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usb: musb: only write CLRDATATOG when appropriate

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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>
This commit is contained in:
Bryan Wu 2010-08-09 14:58:24 -04:00 committed by Remy Bohmer
parent 99e9ed1f49
commit 4ee691f6ac
1 changed files with 16 additions and 7 deletions
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23
drivers/usb/musb/musb_hcd.c
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@ -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);