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usb: gadget: mv_udc: flush item before head

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Make sure the transfer descriptor is flushed
before the queue is updated so that the controller
will not see old information.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
This commit is contained in:
Troy Kisky 2013-09-25 18:41:12 -07:00 committed by Marek Vasut
parent 5a90443048
commit 5fc2e99732
1 changed files with 2 additions and 3 deletions
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5
drivers/usb/gadget/mv_udc.c
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@ -335,21 +335,20 @@ static int mv_ep_queue(struct usb_ep *ep,
item->info = INFO_BYTES(len) | INFO_IOC | INFO_ACTIVE;
item->page0 = (uint32_t)mv_ep->b_buf;
item->page1 = ((uint32_t)mv_ep->b_buf & 0xfffff000) + 0x1000;
mv_flush_qtd(num);
head->next = (unsigned) item;
head->info = 0;
DBG("ept%d %s queue len %x, buffer %p\n",
num, in ? "in" : "out", len, mv_ep->b_buf);
mv_flush_qh(num);
if (in)
bit = EPT_TX(num);
else
bit = EPT_RX(num);
mv_flush_qh(num);
mv_flush_qtd(num);
writel(bit, &udc->epprime);
return 0;