diff options
| author | Matthieu CASTET <matthieu.castet@parrot.com> | 2014-02-19 13:46:31 +0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-05 17:13:48 +0100 |
| commit | 2e7a84eab131472ea8f413428a9bdedd54a143b5 (patch) | |
| tree | 36015492b7e1ea939c7b3a61d71451bc4d9a36cc | |
| parent | a2879c1d14a1bd066b2597d778fb9d89d05bdab0 (diff) | |
| download | linux-rt-2e7a84eab131472ea8f413428a9bdedd54a143b5.tar.gz | |
usb: chipidea: need to mask when writting endptflush and endptprime
commit 5bf5dbeda2454296f1984adfbfc8e6f5965ac389 upstream.
ENDPTFLUSH and ENDPTPRIME registers are set by software and clear
by hardware. There is a bit for each endpoint. When we are setting
a bit for an endpoint we should make sure we do not touch other
endpoint bit. There is a race condition if the hardware clear the
bit between the read and the write in hw_write.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
Tested-by: Michael Grzeschik <mgrzeschik@pengutronix.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/usb/chipidea/udc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index 94c26acfd5a4..938426ae30de 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -106,7 +106,7 @@ static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir) do { /* flush any pending transfer */ - hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n)); + hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n)); while (hw_read(ci, OP_ENDPTFLUSH, BIT(n))) cpu_relax(); } while (hw_read(ci, OP_ENDPTSTAT, BIT(n))); @@ -206,7 +206,7 @@ static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl) if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) return -EAGAIN; - hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n)); + hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n)); while (hw_read(ci, OP_ENDPTPRIME, BIT(n))) cpu_relax(); |