Commit f2694a93 authored by Janusz Dziedzic's avatar Janusz Dziedzic Committed by Felipe Balbi

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: default avatarJanusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 87aba106
......@@ -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;
......
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