Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0d25744a authored by John Youn's avatar John Youn Committed by Felipe Balbi
Browse files

usb: dwc3: gadget: Initialize the TRB ring 



Clears out all the TRBs in the ring to clean up any stale data that
might be in them from the previous time the endpoint was enabled.

Also removed the existing clear of the LINK trb since the entire ring is
cleard just before.

Signed-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent dca0119c

drivers/usb/dwc3/gadget.c

+6 −2
Original line number Diff line number Diff line
@@ -585,12 +585,16 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, 
		if (usb_endpoint_xfer_control(desc))

			return 0;



		/* Initialize the TRB ring */

		dep->trb_dequeue = 0;

		dep->trb_enqueue = 0;

		memset(dep->trb_pool, 0,

		       sizeof(struct dwc3_trb) * DWC3_TRB_NUM);



		/* Link TRB. The HWO bit is never reset */

		trb_st_hw = &dep->trb_pool[0];



		trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];

		memset(trb_link, 0, sizeof(*trb_link));



		trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));

		trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));

		trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;