Commit e62c5bc5 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: gadget: tracking per-TRB remaining bytes 



This will give us a simpler way of figuring out how
many bytes were left in each TRB. It's useful for
cases where we queue only part of an SG-list due to
amount of available TRBs at the time of kicking the
transfer.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 6cb2e4e3

drivers/usb/dwc3/core.h

+2 −0
Original line number Diff line number Diff line
@@ -715,6 +715,7 @@ struct dwc3_hwparams { 
 * @dep: struct dwc3_ep owning this request

 * @sg: pointer to first incomplete sg

 * @num_pending_sgs: counter to pending sgs

 * @remaining: amount of data remaining

 * @epnum: endpoint number to which this request refers

 * @trb: pointer to struct dwc3_trb

 * @trb_dma: DMA address of @trb
@@ -729,6 +730,7 @@ struct dwc3_request { 
	struct scatterlist	*sg;



	unsigned		num_pending_sgs;

	unsigned		remaining;

	u8			epnum;

	struct dwc3_trb		*trb;

	dma_addr_t		trb_dma;

drivers/usb/dwc3/gadget.c

+6 −13
Original line number Diff line number Diff line
@@ -178,6 +178,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, 
	req->started = false;

	list_del(&req->list);

	req->trb = NULL;

	req->remaining = 0;



	if (req->request.status == -EINPROGRESS)

		req->request.status = status;
@@ -2014,7 +2015,7 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep, 
		return 1;



	count = trb->size & DWC3_TRB_SIZE_MASK;

	req->request.actual += count;

	req->remaining += count;



	if (dep->direction) {

		if (count) {
@@ -2068,11 +2069,10 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, 
	struct dwc3_request	*req, *n;

	struct dwc3_trb		*trb;

	bool			ioc = false;

	int			ret;

	int			ret = 0;



	list_for_each_entry_safe(req, n, &dep->started_list, list) {

		unsigned length;

		unsigned actual;

		int chain;



		length = req->request.length;
@@ -2100,17 +2100,10 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, 
					event, status, chain);

		}



		/*

		 * We assume here we will always receive the entire data block

		 * which we should receive. Meaning, if we program RX to

		 * receive 4K but we receive only 2K, we assume that's all we

		 * should receive and we simply bounce the request back to the

		 * gadget driver for further processing.

		 */

		actual = length - req->request.actual;

		req->request.actual = actual;

		req->request.actual = length - req->remaining;



		if (ret && chain && (actual < length) && req->num_pending_sgs)

		if (ret && chain && (req->request.actual < length)

				&& req->num_pending_sgs)

			return __dwc3_gadget_kick_transfer(dep, 0);



		dwc3_gadget_giveback(dep, req, status);

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