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usb: gadget: mv_udc: fix dtd dma confusion

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The controller will prime failure sometimes when do the iperf test.
Add delay to wait controller release dtd dma before we free it.
Then the issue is gone.

Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Neil Zhang 2011-10-12 16:49:36 +08:00 committed by Felipe Balbi
parent 046b07ac04
commit daec765da7
1 changed files with 26 additions and 1 deletions
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27
drivers/usb/gadget/mv_udc_core.c
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@ -138,6 +138,7 @@ static int process_ep_req(struct mv_udc *udc, int index,
int i, direction;
int retval = 0;
u32 errors;
u32 bit_pos;
curr_dqh = &udc->ep_dqh[index];
direction = index % 2;
@ -155,10 +156,20 @@ static int process_ep_req(struct mv_udc *udc, int index,
errors = curr_dtd->size_ioc_sts & DTD_ERROR_MASK;
if (!errors) {
remaining_length +=
remaining_length =
(curr_dtd->size_ioc_sts & DTD_PACKET_SIZE)
>> DTD_LENGTH_BIT_POS;
actual -= remaining_length;
if (remaining_length) {
if (direction) {
dev_dbg(&udc->dev->dev,
"TX dTD remains data\n");
retval = -EPROTO;
break;
} else
break;
}
} else {
dev_info(&udc->dev->dev,
"complete_tr error: ep=%d %s: error = 0x%x\n",
@ -180,6 +191,20 @@ static int process_ep_req(struct mv_udc *udc, int index,
if (retval)
return retval;
if (direction == EP_DIR_OUT)
bit_pos = 1 << curr_req->ep->ep_num;
else
bit_pos = 1 << (16 + curr_req->ep->ep_num);
while ((curr_dqh->curr_dtd_ptr == curr_dtd->td_dma)) {
if (curr_dtd->dtd_next == EP_QUEUE_HEAD_NEXT_TERMINATE) {
while (readl(&udc->op_regs->epstatus) & bit_pos)
udelay(1);
break;
}
udelay(1);
}
curr_req->req.actual = actual;
return 0;