Hi all,
I recently bought two X-craft 360 HDD cases and I realized that the
USB stack in Linux plays badly with them. The google found that people were
working on this issue, but no definitive solution was found:
http://bugzilla.kernel.org/show_bug.cgi?id=8639
http://forum.coolermaster.com/viewtopic.php?f=23&t=8487
http://www.mail-archive.com/linux-usb@vger.kernel.org/msg02007.html
After some testing, I figured that the used chip (see bellow)
requrires in some cases (try turn HDD box off and on when connected) about
10 seconds to reply to USB_REQ_GET_DESCRIPTOR . But include/linux/usb.h
says that USB specification identifies just 5 second timeouts thus
USB_CTRL_GET_TIMEOUT is set to 5000 milliseconds. This device gets
confused with the short timeout.
Device identification:
Sep 16 14:09:52 master kernel: usb 1-1: New USB device found, idVendor=ed06, idProduct=8000
Sep 16 14:09:52 master kernel: usb 1-1: New USB device strings: Mfr=16, Product=32, SerialNumber=48
Sep 16 14:09:52 master kernel: usb 1-1: Product: SATA8000 FW1.0
Sep 16 14:09:52 master kernel: usb 1-1: Manufacturer: DATAST0R Technology Corp
Sep 16 14:09:52 master kernel: usb 1-1: SerialNumber: 1966051022645658
USB_REQ_GET_DESCRIPTOR 10 second delay (witch patched kernel):
Sep 16 14:36:42 master kernel: usb 1-1: new high speed USB device using ehci_hcd and address 6
Sep 16 14:36:52 master kernel: usb 1-1: configuration #1 chosen from 1 choice
Possible fixes:
a) modify include/linux/usb.h
#define USB_CTRL_GET_TIMEOUT 12000
b) modify drivers/usb/core/hub.c (probably better solution)
========
Subj: USB: hub.c: Increase USB_REQ_GET_DESCRIPTOR timeout (for SATA8000)
This patch increases timeout to 12 seconds for the SATA8000 device from
DATAST0R Technology Corp (measured maximum response time is 10 seconds).
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
--- drivers/usb/core/hub.c.old 2008-09-15 15:45:54.000000000 +0200
+++ drivers/usb/core/hub.c 2008-09-16 14:42:11.000000000 +0200
@@ -2399,11 +2399,16 @@
*/
for (j = 0; j < 3; ++j) {
buf->bMaxPacketSize0 = 0;
+ /*
+ * Device SATA8000 FW1.0 from DATAST0R Technology Corp
+ * requires about 10 seconds to send reply for
+ * the descriptor request.
+ */
r = usb_control_msg(udev, usb_rcvaddr0pipe(),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
USB_DT_DEVICE << 8, 0,
buf, GET_DESCRIPTOR_BUFSIZE,
- USB_CTRL_GET_TIMEOUT);
+ 12000);
switch (buf->bMaxPacketSize0) {
case 8: case 16: case 32: case 64: case 255:
if (buf->bDescriptorType ==
========
-----
Jaroslav Kysela <perex@perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.
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