This patch changes the read of the td status to one atomic operation to
analyse coherent bits.
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
---
Changes since v1:
- fixed patch description
drivers/usb/chipidea/udc.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index e15f5e5..b7f0a7b 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -492,10 +492,14 @@ done:
*/
static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
{
+ u32 tmptoken;
+
if (mReq->req.status != -EALREADY)
return -EINVAL;
- if ((TD_STATUS_ACTIVE & readl(&mReq->ptr->token)) != 0)
+ tmptoken = readl(&mReq->ptr->token);
+
+ if ((TD_STATUS_ACTIVE & tmptoken) != 0)
return -EBUSY;
if (mReq->zptr) {
@@ -509,7 +513,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
- mReq->req.status = readl(&mReq->ptr->token) & TD_STATUS;
+ mReq->req.status = tmptoken & TD_STATUS;
if ((TD_STATUS_HALTED & mReq->req.status) != 0)
mReq->req.status = -1;
else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
@@ -517,7 +521,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
mReq->req.status = -1;
- mReq->req.actual = readl(&mReq->ptr->token) & TD_TOTAL_BYTES;
+ mReq->req.actual = tmptoken & TD_TOTAL_BYTES;
mReq->req.actual >>= __ffs(TD_TOTAL_BYTES);
mReq->req.actual = mReq->req.length - mReq->req.actual;
mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
--
1.8.2.rc2
--
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