I'm happy to say usb no longer hangs on my single board computer! I thought I'd try diffing the uhci code from the kernel we had working, (2.4.18) and kernels that don't (so far 2.4.23 and 2.4.24). I got down to _one_ line causing the problem:
uhci->fsbr = 0; ...in alloc_uhci().
Which was of course added in 2.4.19. I removed the line, since it's not in 2.4.18, and all the devices I had trouble with worked. Is this worth posting to the dev list? Can someone tell me the effect of setting fsbr to 0?
Guennadi Liakhovetski wrote:
> Sorry, I have very little time these days, I will have a better look
> at your debugging output, but meanwhile - do you have a chance to
> up/downgrade the BIOS on your non-working 600MHz system to the 400MHz
> state?
That's been tried, and we killed a 600MHz board in the process! We asked the board producer (Boser) to do it for us as well, but didn't hear much back from them...
Unfourtunately though, my problems haven't gone away. the usb bandwidth isn't high enough for what we want to do, it seems to be stopping and starting when trying to do bulk transfers. And since 'full speed bandwidth reclamation' was causing my problems before, it sounds related to me.
I'll try and produce some decent data to show that it's slow, but in the mean time here is the dmesg and /proc/bus/usb/devices output of our running (but slow) system:
dmesg:
hub.c: new USB device 00:07.2-1, assigned address 7
usb.c: kmalloc IF ce747700, numif 1
usb.c: new device strings: Mfr=1, Product=2, SerialNumber=0
usb.c: USB device number 7 default language ID 0x409
Manufacturer: Texas Instruments, Inc.
Product: TMX320VC5509
usb.c: unhandled interfaces on device
usb.c: USB device 7 (vend/prod 0x451/0x9001) is not claimed by any active driver.
Length = 18
DescriptorType = 01
USB version = 1.01
Vendor:Product = 0451:9001
MaxPacketSize0 = 64
NumConfigurations = 1
Device version = 0.00
Device Class:SubClass:Protocol = 00:00:00
Per-interface classes
Configuration:
bLength = 9
bDescriptorType = 02
wTotalLength = 0019
bNumInterfaces = 01
bConfigurationValue = 01
iConfiguration = 03
bmAttributes = c0
MaxPower = 0mA
Interface: 0
Alternate Setting: 0
bLength = 9
bDescriptorType = 04
bInterfaceNumber = 00
bAlternateSetting = 00
bNumEndpoints = 01
bInterface Class:SubClass:Protocol = 00:00:00
iInterface = 04
Endpoint:
bLength = 7
bDescriptorType = 05
bEndpointAddress = 81 (in)
bmAttributes = 02 (Bulk)
wMaxPacketSize = 0040
bInterval = 00
usb.c: kusbd: /sbin/hotplug add 7
hub.c: port 2, portstatus 300, change 0, 1.5 Mb/s
hub.c: port 1, portstatus 103, change 0, 12 Mb/s
hub.c: port 2, portstatus 300, change 0, 1.5 Mb/s
usb.c: usbdevfs driver claimed interface ce747700
uhci.c: root-hub INT complete: port1: 48a port2: 580 data: 2
uhci.c: c400: suspend_hc
uhci.c: root-hub INT complete: port1: 48a port2: 580 data: 2
uhci.c: root-hub INT complete: port1: 48a port2: 580 data: 2
hub.c: port 1, portstatus 100, change 3, 12 Mb/s
hub.c: port 1 connection change
hub.c: port 1, portstatus 100, change 3, 12 Mb/s
usb.c: USB disconnect on device 00:07.2-1 address 7
usb.c: kusbd: /sbin/hotplug remove 7
uhci.c: root-hub INT complete: port1: 488 port2: 580 data: 2
hub.c: port 2, portstatus 300, change 0, 1.5 Mb/s
hub.c: port 1, portstatus 100, change 2, 12 Mb/s
hub.c: port 1 enable change, status 100
hub.c: port 2, portstatus 300, change 0, 1.5 Mb/s/proc/bus/usb/devices: T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB UHCI-alt Root Hub S: SerialNumber=c400 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 9 Spd=12 MxCh= 0 D: Ver= 1.01 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0451 ProdID=9001 Rev= 0.00 S: Manufacturer=Texas Instruments, Inc. S: Product=TMX320VC5509 C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=00(>ifc ) Sub=00 Prot=00 Driver=usbdevfs E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
Thanks, Malcolm.
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