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>
This commit is contained in:
parent
d70d84423c
commit
2e81c36a00
|
@ -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",
|
||||
|
|
Loading…
Reference in a new issue