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usb: dwc3: ep0: Add chained TRB support

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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: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2015-07-27 12:25:31 +05:30 committed by Felipe Balbi
parent 368ca113ca
commit 2abd9d5fa6
2 changed files with 14 additions and 4 deletions
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16
drivers/usb/dwc3/ep0.c
View File

@ -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);

2
drivers/usb/dwc3/gadget.c
View File

@ -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");