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usb: devio: update max count of DPs per interval for ISOC 

The failure happened when I tried to send up to 96DPs per an interval
for SSP ISOC transations by libusb, this is used to verify SSP ISOC
function of USB3 GEN2 controller, so update it as 96DPs.
(refer usb3.1r1.0 section 8.12.6 Isochronous Transactions)

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2019-01-02 09:33:56 +08:00 committed by Greg Kroah-Hartman
parent d1ab1b8420
commit 8a1dbc8d91
1 changed files with 3 additions and 5 deletions
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8
drivers/usb/core/devio.c
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@ -1564,12 +1564,10 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
}
for (totlen = u = 0; u < number_of_packets; u++) {
/*
* arbitrary limit need for USB 3.0
* bMaxBurst (0~15 allowed, 1~16 packets)
* bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
* sizemax: 1024 * 16 * 3 = 49152
* arbitrary limit need for USB 3.1 Gen2
* sizemax: 96 DPs at SSP, 96 * 1024 = 98304
*/
if (isopkt[u].length > 49152) {
if (isopkt[u].length > 98304) {
ret = -EINVAL;
goto error;
}