From: Chunfeng Yun <chunfeng.yun@mediatek.com>
Date: Wed, 2 Jan 2019 01:33:56 +0000 (+0800)
Subject: usb: devio: update max count of DPs per interval for ISOC
X-Git-Tag: v5.1-rc1~142^2~92
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8a1dbc8d91d3d1602282c7e6b4222c7759c916fa;p=linux.git

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>
---

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index d65566341dd1..a12f2ce8df90 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -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;
 			}