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usb: dwc3: gadget: allocate bounce buffer for unaligned xfers

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Allocate a coherent buffer of 1024 bytes (size of a single superspeed
bulk packet) to serve as bounce buffer for an extra TRB needed to align
transfers to wMaxPacketSize.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2017-01-05 14:46:52 +02:00
parent e49d3cf492
commit 905dc04ea7
2 changed files with 17 additions and 2 deletions
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3
drivers/usb/dwc3/core.h
View File

@ -40,6 +40,7 @@
/* Global constants */
#define DWC3_PULL_UP_TIMEOUT 500 /* ms */
#define DWC3_ZLP_BUF_SIZE 1024 /* size of a superspeed bulk */
#define DWC3_BOUNCE_SIZE 1024 /* size of a superspeed bulk */
#define DWC3_EP0_BOUNCE_SIZE 512
#define DWC3_ENDPOINTS_NUM 32
#define DWC3_XHCI_RESOURCES_NUM 2
@ -857,12 +858,14 @@ struct dwc3_scratchpad_array {
struct dwc3 {
struct usb_ctrlrequest *ctrl_req;
struct dwc3_trb *ep0_trb;
void *bounce;
void *ep0_bounce;
void *zlp_buf;
void *scratchbuf;
u8 *setup_buf;
dma_addr_t ctrl_req_addr;
dma_addr_t ep0_trb_addr;
dma_addr_t bounce_addr;
dma_addr_t ep0_bounce_addr;
dma_addr_t scratch_addr;
struct dwc3_request ep0_usb_req;

16
drivers/usb/dwc3/gadget.c
View File

@ -3021,6 +3021,13 @@ int dwc3_gadget_init(struct dwc3 *dwc)
goto err4;
}
dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
&dwc->bounce_addr, GFP_KERNEL);
if (!dwc->bounce) {
ret = -ENOMEM;
goto err5;
}
init_completion(&dwc->ep0_in_setup);
dwc->gadget.ops = &dwc3_gadget_ops;
@ -3064,15 +3071,18 @@ int dwc3_gadget_init(struct dwc3 *dwc)
ret = dwc3_gadget_init_endpoints(dwc);
if (ret)
goto err5;
goto err6;
ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
if (ret) {
dev_err(dwc->dev, "failed to register udc\n");
goto err5;
goto err6;
}
return 0;
err6:
dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
dwc->bounce_addr);
err5:
kfree(dwc->zlp_buf);
@ -3105,6 +3115,8 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
dwc3_gadget_free_endpoints(dwc);
dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
dwc->bounce_addr);
dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
dwc->ep0_bounce, dwc->ep0_bounce_addr);