diff options
| author | Felipe Balbi <balbi@ti.com> | 2012-02-02 13:01:12 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-02-06 17:06:12 +0200 |
| commit | 2e81c36a00d0eb8ce72faaaec1a1d865617374ae (patch) | |
| tree | 7dabea56a2bcc268038affa34e4ab11a7ca80414 /drivers/usb | |
| parent | d70d84423cbc5d6d929640189cf204e693024309 (diff) | |
usb: dwc3: gadget: allocate 3 packets for bulk and isoc endpoints
Those transfer types are generally high bandwidth, so we
want to optimize transfers with those endpoints.
For that, databook suggests allocating 3 * wMaxPacketSize
of FIFO. Let's do that.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 1f64e7c1c34..c30ab6da3d0 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -172,6 +172,7 @@ int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) for (num = 0; num < DWC3_ENDPOINTS_NUM; num++) { struct dwc3_ep *dep = dwc->eps[num]; int fifo_number = dep->number >> 1; + int mult = 1; int tmp; if (!(dep->number & 1)) @@ -180,11 +181,26 @@ int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) if (!(dep->flags & DWC3_EP_ENABLED)) continue; - tmp = dep->endpoint.maxpacket; - tmp += mdwidth; + if (usb_endpoint_xfer_bulk(dep->desc) + || usb_endpoint_xfer_isoc(dep->desc)) + mult = 3; + + /* + * REVISIT: the following assumes we will always have enough + * space available on the FIFO RAM for all possible use cases. + * Make sure that's true somehow and change FIFO allocation + * accordingly. + * + * If we have Bulk or Isochronous endpoints, we want + * them to be able to be very, very fast. So we're giving + * those endpoints a fifo_size which is enough for 3 full + * packets + */ + tmp = mult * (dep->endpoint.maxpacket + mdwidth); tmp += mdwidth; fifo_size = DIV_ROUND_UP(tmp, mdwidth); + fifo_size |= (last_fifo_depth << 16); dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n", |