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| author | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-01-05 14:46:52 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-01-24 11:04:12 +0200 |
| commit | 905dc04ea796e77e003c5020a3f9f1509cc7a275 (patch) | |
| tree | 7c67cb4d2e0f4717043803028426790e07ff7aa9 /drivers/usb/dwc3/gadget.c | |
| parent | e49d3cf4926af0ff713238acd31514e50f1004ec (diff) | |
| download | lwn-905dc04ea796e77e003c5020a3f9f1509cc7a275.tar.gz lwn-905dc04ea796e77e003c5020a3f9f1509cc7a275.zip | |
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>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 16 |
1 files changed, 14 insertions, 2 deletions
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); |