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usb: dwc2: remove restriction on buffer length

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Each USB transfer is split up into chunks that are held in an aligned
buffer. This imposes a limit on the size of each chunk, but no limit on
the total size of transferred data. Fix the logic in chunk_msg() not to
reject large transfers, but simply take the size of the aligned buffer
into account when calculating the chunk size.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stephen Warren 2015-03-08 11:08:14 -06:00 committed by Marek Vasut
parent d1c880c66c
commit 805b67e1ea
1 changed files with 3 additions and 9 deletions
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12
drivers/usb/host/dwc2.c
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@ -756,24 +756,18 @@ int chunk_msg(struct usb_device *dev, unsigned long pipe, int *pid, int in,
debug("%s: msg: pipe %lx pid %d in %d len %d\n", __func__, pipe, *pid,
in, len);
if (len > DWC2_DATA_BUF_SIZE) {
printf("%s: %d is more then available buffer size (%d)\n",
__func__, len, DWC2_DATA_BUF_SIZE);
dev->status = 0;
dev->act_len = 0;
return -EINVAL;
}
do {
/* Initialize channel */
dwc_otg_hc_init(regs, DWC2_HC_CHANNEL, devnum, ep, in, eptype,
max);
xfer_len = len - done;
/* Make sure that xfer_len is a multiple of max packet size. */
if (xfer_len > CONFIG_DWC2_MAX_TRANSFER_SIZE)
xfer_len = CONFIG_DWC2_MAX_TRANSFER_SIZE - max + 1;
if (xfer_len > DWC2_DATA_BUF_SIZE)
xfer_len = DWC2_DATA_BUF_SIZE - max + 1;
/* Make sure that xfer_len is a multiple of max packet size. */
if (xfer_len > 0) {
num_packets = (xfer_len + max - 1) / max;
if (num_packets > CONFIG_DWC2_MAX_PACKET_COUNT) {