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Commit 2abd9d5f authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Felipe Balbi
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usb: dwc3: ep0: Add chained TRB support 



Add chained TRB support to ep0. Now TRB's can be chained just by
invoking _dwc3_ep0_start_trans_ with 'chain' parameter set to true.

Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 368ca113

drivers/usb/dwc3/ep0.c

+13 −3
Original line number Diff line number Diff line
@@ -70,7 +70,10 @@ static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma, 
		return 0;

	}



	trb = dwc->ep0_trb;

	trb = &dwc->ep0_trb[dep->free_slot];



	if (chain)

		dep->free_slot++;



	trb->bpl = lower_32_bits(buf_dma);

	trb->bph = upper_32_bits(buf_dma);
@@ -78,10 +81,17 @@ static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma, 
	trb->ctrl = type;



	trb->ctrl |= (DWC3_TRB_CTRL_HWO

			| DWC3_TRB_CTRL_LST

			| DWC3_TRB_CTRL_IOC

			| DWC3_TRB_CTRL_ISP_IMI);



	if (chain)

		trb->ctrl |= DWC3_TRB_CTRL_CHN;

	else

		trb->ctrl |= (DWC3_TRB_CTRL_IOC

				| DWC3_TRB_CTRL_LST);



	if (chain)

		return 0;



	memset(&params, 0, sizeof(params));

	params.param0 = upper_32_bits(dwc->ep0_trb_addr);

	params.param1 = lower_32_bits(dwc->ep0_trb_addr);

drivers/usb/dwc3/gadget.c

+1 −1
Original line number Diff line number Diff line
@@ -2687,7 +2687,7 @@ int dwc3_gadget_init(struct dwc3 *dwc) 
		goto err0;

	}



	dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),

	dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,

			&dwc->ep0_trb_addr, GFP_KERNEL);

	if (!dwc->ep0_trb) {

		dev_err(dwc->dev, "failed to allocate ep0 trb\n");