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usb: dwc3: warn on once when no trbs 

Seems last time we hit few issues where
we get trb_left = 0, mainly because of
HWO bit still set in previous TRB.
Add warn on once to catch/fix such
problems much faster.

Signed-off-by: Janusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Janusz Dziedzic 2016-11-09 11:01:35 +01:00 committed by Felipe Balbi
parent 87aba10639
commit f2694a93e0
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/dwc3/gadget.c
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@ -937,6 +937,7 @@ static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
{
struct dwc3_trb *tmp;
struct dwc3 *dwc = dep->dwc;
u8 trbs_left;
/*
@ -948,7 +949,8 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
*/
if (dep->trb_enqueue == dep->trb_dequeue) {
tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
if (tmp->ctrl & DWC3_TRB_CTRL_HWO)
if (dev_WARN_ONCE(dwc->dev, tmp->ctrl & DWC3_TRB_CTRL_HWO,
"%s No TRBS left\n", dep->name))
return 0;
return DWC3_TRB_NUM - 1;