diff options
| author | Felipe Balbi | 2017-01-05 14:46:52 +0200 |
|---|---|---|
| committer | Felipe Balbi | 2017-01-24 11:04:12 +0200 |
| commit | 905dc04ea796e77e003c5020a3f9f1509cc7a275 (patch) | |
| tree | 7c67cb4d2e0f4717043803028426790e07ff7aa9 | |
| parent | e49d3cf4926af0ff713238acd31514e50f1004ec (diff) | |
usb: dwc3: gadget: allocate bounce buffer for unaligned xfers
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>
| -rw-r--r-- | drivers/usb/dwc3/core.h | 3 | ||||
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 16 |
2 files changed, 17 insertions, 2 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 14b760209680..9b4b79ae0beb 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -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; diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index f1ffbf789e0a..653251751e38 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -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); |