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

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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: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-10-25 13:47:21 +03:00
parent 6cb2e4e3de
commit e62c5bc573
2 changed files with 8 additions and 13 deletions
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2
drivers/usb/dwc3/core.h
View File

@ -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;

19
drivers/usb/dwc3/gadget.c
View File

@ -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);