On Thu, Aug 7, 2008 at 3:38 PM, David Brownell <david-b@xxxxxxxxxxx> wrote: > On Thursday 07 August 2008, Ashwin Bihari wrote: > >> sd 0:0:0:0: [sda] Attached SCSI removable disk >> usb 1-2: reset high speed USB device using ehci-omap and address 2 >> usb 1-2: device descriptor read/64, error -110 >> usb 1-2: device descriptor read/64, error -110 >> usb 1-2: reset high speed USB device using ehci-omap and address 2 >> usb 1-2: device descriptor read/64, error -110 >> usb 1-2: device descriptor read/64, error -110 >> usb 1-2: reset high speed USB device using ehci-omap and address 2 >> usb 1-2: device not accepting address 2, error -110 >> usb 1-2: reset high speed USB device using ehci-omap and address 2 >> usb 1-2: device not accepting address 2, error -110 >> usb 1-2: USB disconnect, address 2 >> sd 0:0:0:0: Device offlined - not ready after error recovery >> Result: hostbyte=0x01 driverbyte=0x00 >> end_request: I/O error, dev sda, sector 775288 >> end_request: I/O error, dev sda, sector 775288 >> ... > > I wouldn't assume this is specifically an OMAP issue -- though > it might be in this case. If you could throw a USB sniffer at > the problem and report what that shows, it may be enlightening... > > Folk have been reporting these symptoms for some time, but > nobody can quite track it down. I think one person who was > able to observe the problem (I've never seen it) reported that > switching disk, USB cable, *OR* PC host made the problem go > away ... but MS-Windows didn't see it on the same hardware. > > As I recall, one person had some recent success shrinking the > "let SET_ADDRESS settle" mdelay in drivers/usb/hub.c (near > line 2535). Strictly speaking, that shouldn't be needed. > > - Dave > Dave, I did use a Total Phase Beagle 480USB protocol analyzer when this issue first manifested, but there is nothing that jumped out at me as a possible error or glitch. It just looks like the transactions just stopped mid-way without any rhyme or reason. I've noticed this issue with a couple of HS flash drives, as well as, a FS CD-ROM drive. Would the "let SET_ADDRESS settle" change only affect the initial detection? My initial insertion of device works great, the errors I showed are after I do a read of a large amount of data from the Flash drive and essentially wedge something in the USB stream. Regards ~ Ashwin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
