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usb: dwc3: gadget: Handle XferComplete for streams 

In DWC3, to prepare TRBs for streams, all the TRBs of a transfer will
use the same stream ID. To start a new stream, the driver needs to wait
for the current transfer to complete or ended (by END_TRANFER command).
As a result, inform the controller of the last TRB of a transfer so that
it knows when a transfer completes and start a new transfer of a new
stream.

Even though the transfer completion handling can be applied for other
non-isoc endpoints, only do it for streams due to its requirement.
It's better to keep the controller's TRB cache full than waiting for
transfer completion and starting a new transfer.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Thinh Nguyen 2020-05-05 19:46:51 -07:00 committed by Felipe Balbi
parent 548f8b3165
commit 3eaecd0c23
1 changed files with 28 additions and 6 deletions
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34
drivers/usb/dwc3/gadget.c
View File

@ -919,7 +919,8 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
dma_addr_t dma, unsigned length, unsigned chain, unsigned node,
unsigned stream_id, unsigned short_not_ok, unsigned no_interrupt)
unsigned stream_id, unsigned short_not_ok,
unsigned no_interrupt, unsigned is_last)
{
struct dwc3 *dwc = dep->dwc;
struct usb_gadget *gadget = &dwc->gadget;
@ -1012,6 +1013,8 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
if (chain)
trb->ctrl |= DWC3_TRB_CTRL_CHN;
else if (dep->stream_capable && is_last)
trb->ctrl |= DWC3_TRB_CTRL_LST;
if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
@ -1039,6 +1042,7 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
unsigned stream_id = req->request.stream_id;
unsigned short_not_ok = req->request.short_not_ok;
unsigned no_interrupt = req->request.no_interrupt;
unsigned is_last = req->request.is_last;
if (req->request.num_sgs > 0) {
length = sg_dma_len(req->start_sg);
@ -1059,7 +1063,7 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
req->num_trbs++;
__dwc3_prepare_one_trb(dep, trb, dma, length, chain, node,
stream_id, short_not_ok, no_interrupt);
stream_id, short_not_ok, no_interrupt, is_last);
}
static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
@ -1104,7 +1108,8 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
maxp - rem, false, 1,
req->request.stream_id,
req->request.short_not_ok,
req->request.no_interrupt);
req->request.no_interrupt,
req->request.is_last);
} else {
dwc3_prepare_one_trb(dep, req, chain, i);
}
@ -1148,7 +1153,8 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem,
false, 1, req->request.stream_id,
req->request.short_not_ok,
req->request.no_interrupt);
req->request.no_interrupt,
req->request.is_last);
} else if (req->request.zero && req->request.length &&
(IS_ALIGNED(req->request.length, maxp))) {
struct dwc3 *dwc = dep->dwc;
@ -1165,7 +1171,8 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
false, 1, req->request.stream_id,
req->request.short_not_ok,
req->request.no_interrupt);
req->request.no_interrupt,
req->request.is_last);
} else {
dwc3_prepare_one_trb(dep, req, false, 0);
}
@ -2718,6 +2725,19 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
dwc3_gadget_endpoint_trbs_complete(dep, event, status);
}
static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep,
const struct dwc3_event_depevt *event)
{
int status = 0;
dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
if (event->status & DEPEVT_STATUS_BUSERR)
status = -ECONNRESET;
dwc3_gadget_endpoint_trbs_complete(dep, event, status);
}
static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
const struct dwc3_event_depevt *event)
{
@ -2781,8 +2801,10 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
dep->flags &= ~DWC3_EP_DELAY_START;
}
break;
case DWC3_DEPEVT_STREAMEVT:
case DWC3_DEPEVT_XFERCOMPLETE:
dwc3_gadget_endpoint_transfer_complete(dep, event);
break;
case DWC3_DEPEVT_STREAMEVT:
case DWC3_DEPEVT_RXTXFIFOEVT:
break;
}