From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit e5b36ae2f851024d43c76e51f395d32ce8d769ce ]
DWC3 has one interesting peculiarity with chained
transfers. If we setup N chained transfers and we
get a short packet before processing all N TRBs,
DWC3 will (conditionally) issue a XferComplete or
XferInProgress event and retire all TRBs from the
one which got a short packet to the last without
clearing their HWO bits.
This means SW must clear HWO bit manually, which
this patch is doing.
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Brian E Rogers <brian.e.rogers@xxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 78722a4f..ec6440f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1802,7 +1802,8 @@ static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
struct dwc3_request *req, struct dwc3_trb *trb,
- const struct dwc3_event_depevt *event, int status)
+ const struct dwc3_event_depevt *event, int status,
+ int chain)
{
unsigned int count;
unsigned int s_pkt = 0;
@@ -1810,6 +1811,19 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
trace_dwc3_complete_trb(dep, trb);
+ /*
+ * If we're in the middle of series of chained TRBs and we
+ * receive a short transfer along the way, DWC3 will skip
+ * through all TRBs including the last TRB in the chain (the
+ * where CHN bit is zero. DWC3 will also avoid clearing HWO
+ * bit and SW has to do it manually.
+ *
+ * We're going to do that here to avoid problems of HW trying
+ * to use bogus TRBs for transfers.
+ */
+ if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
+ trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
+
if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
/*
* We continue despite the error. There is not much we
@@ -1821,6 +1835,7 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
*/
dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
dep->name, trb);
+
count = trb->size & DWC3_TRB_SIZE_MASK;
if (dep->direction) {
@@ -1881,11 +1896,15 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
int ret;
do {
+ int chain;
+
req = next_request(&dep->req_queued);
if (!req) {
WARN_ON_ONCE(1);
return 1;
}
+
+ chain = req->request.num_mapped_sgs > 0;
i = 0;
do {
slot = req->start_slot + i;
@@ -1896,9 +1915,8 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
trb = &dep->trb_pool[slot];
count += trb->size & DWC3_TRB_SIZE_MASK;
-
ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
- event, status);
+ event, status, chain);
if (ret)
break;
}while (++i < req->request.num_mapped_sgs);
--
2.7.4
--
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