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usb: dwc3: gadget: Handle ZLP for sg requests

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Currently dwc3 doesn't handle usb_request->zero for SG requests. This
change checks and prepares extra TRBs for the ZLP for SG requests.

Cc: <stable@vger.kernel.org> # v4.5+
Fixes: 04c03d10e507 ("usb: dwc3: gadget: handle request->zero")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Thinh Nguyen 2020-08-06 19:46:35 -07:00 committed by Felipe Balbi
parent d2ee3ff79e
commit bc9a2e226e
1 changed files with 31 additions and 0 deletions
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31
drivers/usb/dwc3/gadget.c
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@ -1143,6 +1143,37 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
req->request.short_not_ok,
req->request.no_interrupt,
req->request.is_last);
} else if (req->request.zero && req->request.length &&
!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
!rem && !chain) {
struct dwc3 *dwc = dep->dwc;
struct dwc3_trb *trb;
req->needs_extra_trb = true;
/* Prepare normal TRB */
dwc3_prepare_one_trb(dep, req, trb_length, true, i);
/* Prepare one extra TRB to handle ZLP */
trb = &dep->trb_pool[dep->trb_enqueue];
req->num_trbs++;
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
!req->direction, 1,
req->request.stream_id,
req->request.short_not_ok,
req->request.no_interrupt,
req->request.is_last);
/* Prepare one more TRB to handle MPS alignment */
if (!req->direction) {
trb = &dep->trb_pool[dep->trb_enqueue];
req->num_trbs++;
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp,
false, 1, req->request.stream_id,
req->request.short_not_ok,
req->request.no_interrupt,
req->request.is_last);
}
} else {
dwc3_prepare_one_trb(dep, req, trb_length, chain, i);
}