Under Windows XP it works. Under SUSE 9.2 it works but stalls, especially when sending large amounts of data.
When a stall occurs it is followed by a reset after two minutes and data transfer resumes, and after a few hundred MBs it will stall again.
Looking into this problem I found some references to the Genesys Logic "bug". But I could not confirm that I have the Genesys logic hardware.
A lsusb gives me: Bus 004 Device 005: ID 0840:0085 Argosy Research, Inc. Bus 004 Device 002: ID 0424:a700 Standard Microsystems Corp. Bus 004 Device 001: ID 0000:0000
Since this problem has all the similar characteristics as reported for the Genesys Logic chip, I tried masking the Argosy hardware as Genesys.
So, I downloaded the latest version of the SUSE kernel (2.6.8 - 3.24) and changed the
Genesys ID (0x05e3) to the Argosy ID (0x0840),
and recompiled the kernel.
I copied several GBytes of data to the external HD without any stalling (!).
This indicated I was on the right track.
Ofcourse I am interested in a more structural approach (most recent on linux-2.6.11.4). My suggestions are listed below (additions marked with "+")
drivers/usb/storage/usb.h (line 187)
/* Vendor ID list for devices that require special handling */ #define USB_VENDOR_ID_GENESYS 0x05e3 /* Genesys Logic */ + #define USB_VENDOR_ID_ARGOSY 0x0840 /* Argosy Research, external HD works with Genesys logic */
drivers/usb/storage/scsiglue.c (line 120-122)
if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_GENESYS
&&
sdev->request_queue->max_sectors > 64)
blk_queue_max_sectors(sdev->request_queue, 64);+ if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_ARGOSY && + sdev->request_queue->max_sectors > 64) + blk_queue_max_sectors(sdev->request_queue, 64);
drivers/usb/storage/transport.c (line 997-998)
/* Genesys Logic interface chips need a 100us delay between the
* command phase and the data phase. Some devices need a little
* more than that, probably because of clock rate inaccuracies. */ if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) ==
USB_VENDOR_ID_GENESYS)
udelay(110);
+ if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) ==
USB_VENDOR_ID_ARGOSY)
+ udelay(110);And that's it.
I have been copying many Gbytes to my external HD without any problems, by using these patches So, hopefully this can be a structural contribution towards the next kernel release?
Frans Nijenhuis
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