From ede7538aefc334ce3bbded966211c149659f19a6 Mon Sep 17 00:00:00 2001
From: Peng Fan <peng.fan@nxp.com>
Date: Mon, 6 Jun 2016 13:53:43 +0800
Subject: [PATCH] MLK-12883 usb: limit USB_MAX_XFER_BLK to 256
For Some USB mass storage devices, such as:
"
- Kingston DataTraveler 2.0 001D7D06CF09B04199C7B3EA
- Class: (from Interface) Mass Storage
- PacketSize: 64 Configurations: 1
- Vendor: 0x0930 Product 0x6545 Version 1.16
"
When `usb read 0x80000000 0 0x2000`, we met
"EHCI timed out on TD - token=0x80008d80".
The devices does not support scsi VPD page, we are not able
to get the maximum transfer length for READ(10)/WRITE(10).
So we limit this to 256 blocks as READ(6).
Signed-off-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit df0052575b2bc9d66ae73584768e1a457ed5d914)
---
common/usb_storage.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/common/usb_storage.c b/common/usb_storage.c
index 1411737bed..ad08deae16 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -16,6 +16,8 @@
* BBB support based on /sys/dev/usb/umass.c from
* FreeBSD.
*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ *
* SPDX-License-Identifier: GPL-2.0+
*/
@@ -138,7 +140,7 @@ struct us_data {
* enough free heap space left, but the SCSI READ(10) and WRITE(10) commands are
* limited to 65535 blocks.
*/
-#define USB_MAX_XFER_BLK 65535
+#define USB_MAX_XFER_BLK 256
#else
#define USB_MAX_XFER_BLK 20
#endif
--
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