diff options
| -rw-r--r-- | drivers/usb/host/xhci.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 4673738d1e..efb075b006 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1138,12 +1138,40 @@ static int _xhci_submit_int_msg(struct usb_device *udev, unsigned long pipe, static int _xhci_submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer, int length) { + int ret; + int xfer_max_per_td, xfer_length, buf_pos; + if (usb_pipetype(pipe) != PIPE_BULK) { printf("non-bulk pipe (type=%lu)", usb_pipetype(pipe)); return -EINVAL; } - return xhci_bulk_tx(udev, pipe, length, buffer); + /* + * When transfering data exceeding the maximum number of TRBs per + * TD (default 64) is requested, the transfer fails with babble + * error or time out. + * + * Thus, huge data transfer should be splitted into multiple TDs. + */ + xfer_max_per_td = TRB_MAX_BUFF_SIZE * (TRBS_PER_SEGMENT - 1); + + buf_pos = 0; + do { + if (length > xfer_max_per_td) + xfer_length = xfer_max_per_td; + else + xfer_length = length; + + ret = xhci_bulk_tx(udev, pipe, xfer_length, buffer + buf_pos); + if (ret < 0) + return ret; + + buf_pos += xfer_length; + length -= xfer_length; + + } while (length > 0); + + return ret; } /** |