usb: dwc3: gadget: Refactor preparing extra TRB
When the driver prepares the extra TRB, it uses bounce buffer. If we just add a new parameter to dwc3_prepare_one_trb() to indicate this, then we can refactor and simplify the driver quite a bit. dwc3_prepare_one_trb() also checks if a request had been moved to the started list. This is a prerequisite to subsequence patches improving the handling of extra TRBs. Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
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@ -1060,10 +1060,11 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
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* @trb_length: buffer size of the TRB
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* @chain: should this TRB be chained to the next?
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* @node: only for isochronous endpoints. First TRB needs different type.
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* @use_bounce_buffer: set to use bounce buffer
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*/
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static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
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struct dwc3_request *req, unsigned int trb_length,
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unsigned int chain, unsigned int node)
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unsigned int chain, unsigned int node, bool use_bounce_buffer)
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{
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struct dwc3_trb *trb;
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dma_addr_t dma;
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@ -1072,7 +1073,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
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unsigned int no_interrupt = req->request.no_interrupt;
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unsigned int is_last = req->request.is_last;
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if (req->request.num_sgs > 0)
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if (use_bounce_buffer)
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dma = dep->dwc->bounce_addr;
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else if (req->request.num_sgs > 0)
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dma = sg_dma_address(req->start_sg);
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else
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dma = req->request.dma;
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@ -1129,56 +1132,35 @@ 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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struct dwc3 *dwc = dep->dwc;
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struct dwc3_trb *trb;
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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, true, i);
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dwc3_prepare_one_trb(dep, req, trb_length,
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true, i, false);
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/* Now prepare one extra TRB to align transfer size */
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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr,
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maxp - rem, false, 1,
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req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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dwc3_prepare_one_trb(dep, req, maxp - rem,
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false, 1, true);
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} else if (req->request.zero && req->request.length &&
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!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
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!rem && !chain) {
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struct dwc3 *dwc = dep->dwc;
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struct dwc3_trb *trb;
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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, true, i);
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dwc3_prepare_one_trb(dep, req, trb_length,
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true, i, false);
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/* Prepare one extra TRB to handle ZLP */
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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
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!req->direction, 1,
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req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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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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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp,
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false, 1, req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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}
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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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} else {
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dwc3_prepare_one_trb(dep, req, trb_length, chain, i);
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dwc3_prepare_one_trb(dep, req, trb_length,
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chain, i, false);
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}
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/*
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@ -1216,54 +1198,29 @@ 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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struct dwc3 *dwc = dep->dwc;
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struct dwc3_trb *trb;
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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);
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dwc3_prepare_one_trb(dep, req, length, true, 0, false);
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/* Now prepare one extra TRB to align transfer size */
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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem,
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false, 1, req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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dwc3_prepare_one_trb(dep, req, maxp - rem, false, 1, true);
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} else if (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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struct dwc3 *dwc = dep->dwc;
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struct dwc3_trb *trb;
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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);
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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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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
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!req->direction, 1, req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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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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trb = &dep->trb_pool[dep->trb_enqueue];
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req->num_trbs++;
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__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp,
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false, 1, req->request.stream_id,
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req->request.short_not_ok,
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req->request.no_interrupt,
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req->request.is_last);
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}
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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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} else {
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dwc3_prepare_one_trb(dep, req, length, false, 0);
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dwc3_prepare_one_trb(dep, req, length, false, 0, false);
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}
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}
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