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

Chunfeng Yun
2018-12-28T10:28:06Z

The host shall be able to accept and send up to 96 DPs for
devices operating at Gen 2 speed.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
drivers/usb/core/devio.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index a75bc0b8a50f..82c16210e34c 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;
}
--
2.19.1