From daec765da767e4a6a30e1298862b28f2cae9a73f Mon Sep 17 00:00:00 2001 From: Neil Zhang Date: Wed, 12 Oct 2011 16:49:36 +0800 Subject: [PATCH] usb: gadget: mv_udc: fix dtd dma confusion 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 Signed-off-by: Felipe Balbi --- drivers/usb/gadget/mv_udc_core.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c index ffa6f3097a6..9d960f1f7c7 100644 --- a/drivers/usb/gadget/mv_udc_core.c +++ b/drivers/usb/gadget/mv_udc_core.c @@ -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; -- 2.46.0