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Commit f2694a93 authored by Janusz Dziedzic's avatar Janusz Dziedzic Committed by Felipe Balbi
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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: default avatarJanusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 87aba106

drivers/usb/dwc3/gadget.c

+3 −1
Original line number Diff line number Diff line
@@ -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;