usb: dwc3: gadget: Improve TRB ZLP setup
For OUT requests that requires extra TRBs for ZLP. We don't need to prepare the 0-length TRB and simply prepare the MPS size TRB. This reduces 1 TRB needed to prepare for ZLP. Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
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@ -1132,11 +1132,12 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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chain = false;
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if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {
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req->needs_extra_trb = true;
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/* prepare normal TRB */
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dwc3_prepare_one_trb(dep, req, trb_length,
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if (req->request.length) {
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req->needs_extra_trb = true;
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dwc3_prepare_one_trb(dep, req, trb_length,
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true, i, false);
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}
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/* Now prepare one extra TRB to align transfer size */
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dwc3_prepare_one_trb(dep, req, maxp - rem,
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@ -1151,13 +1152,9 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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true, i, false);
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/* Prepare one extra TRB to handle ZLP */
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dwc3_prepare_one_trb(dep, req, 0,
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!req->direction, 1, true);
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/* Prepare one more TRB to handle MPS alignment */
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if (!req->direction)
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dwc3_prepare_one_trb(dep, req, maxp,
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false, 1, true);
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dwc3_prepare_one_trb(dep, req,
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req->direction ? 0 : maxp,
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false, 1, true);
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} else {
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dwc3_prepare_one_trb(dep, req, trb_length,
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chain, i, false);
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@ -1198,10 +1195,11 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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unsigned int rem = length % maxp;
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if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) {
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req->needs_extra_trb = true;
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/* prepare normal TRB */
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dwc3_prepare_one_trb(dep, req, length, true, 0, false);
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if (req->request.length) {
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req->needs_extra_trb = true;
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dwc3_prepare_one_trb(dep, req, length, true, 0, false);
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}
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/* Now prepare one extra TRB to align transfer size */
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dwc3_prepare_one_trb(dep, req, maxp - rem, false, 1, true);
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@ -1214,11 +1212,8 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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dwc3_prepare_one_trb(dep, req, length, true, 0, false);
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/* Prepare one extra TRB to handle ZLP */
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dwc3_prepare_one_trb(dep, req, 0, !req->direction, 1, true);
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/* Prepare one more TRB to handle MPS alignment for OUT */
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if (!req->direction)
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dwc3_prepare_one_trb(dep, req, maxp, false, 1, true);
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dwc3_prepare_one_trb(dep, req, req->direction ? 0 : maxp,
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false, 1, true);
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} else {
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dwc3_prepare_one_trb(dep, req, length, false, 0, false);
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}
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@ -2621,12 +2616,12 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
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}
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/*
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* If we're dealing with unaligned size OUT transfer, we will be left
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* with one TRB pending in the ring. We need to manually clear HWO bit
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* from that TRB.
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* We use bounce buffer for requests that needs extra TRB or OUT ZLP. If
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* this TRB points to the bounce buffer address, it's a MPS alignment
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* TRB. Don't add it to req->remaining calculation.
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*/
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if (req->needs_extra_trb && !(trb->ctrl & DWC3_TRB_CTRL_CHN)) {
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if (trb->bpl == lower_32_bits(dep->dwc->bounce_addr) &&
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trb->bph == upper_32_bits(dep->dwc->bounce_addr)) {
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trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
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return 1;
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}
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@ -2707,17 +2702,8 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
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goto out;
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if (req->needs_extra_trb) {
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unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
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ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
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status);
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/* Reclaim MPS padding TRB for ZLP */
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if (!req->direction && req->request.zero && req->request.length &&
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!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
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(IS_ALIGNED(req->request.length, maxp)))
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ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event, status);
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req->needs_extra_trb = false;
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}
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