[maemo-developers] Unable to get device detected with usb host mode on N800

[From: Tony Lindgren]

Hi,

* Vasudevan Srinivasan <vazudevan at gmail.com> [070524 08:47]:
> Hi,
>
> The host side drivers were compiled in, CONFIG_USB_OTG_WHITELIST was set
> off.
> I could not get things up with the hub, so this time I cooked up a Y
> connector
> with external power source(a usb port from desktop without d+ and d-),
> connected n800 and flash disk to other ends.
>
> I was able to get the flash disk working only for a while, after a shutdown
> and start of n800
> it stopped working with the following errors in dmesg.
> Have i messed up with something? Any clues / pointers?
>
> <dmesg>
> [  174.530487] musb_stage0_irq 528: CONNECT (a_host) devctl 5d
> [  174.530578] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
> [  174.530670] hub 1-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
> [  174.681610] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms
> status 0x101
> [  174.807830] usb 1-1: new high speed USB device using musb_hdrc and
> address 2
> [  175.807800] usb 1-1: khubd timed out on ep0in len=0/64
> [  176.807800] usb 1-1: khubd timed out on ep0in len=0/64
> [  177.807281] usb 1-1: khubd timed out on ep0in len=0/64
> [  177.932800] usb 1-1: device descriptor read/64, error -110
> [  182.815063] Unhandled trap: 0x18000010
> [  183.041229] usb 1-1: khubd timed out on ep0in len=0/64
> [  188.042236] usb 1-1: khubd timed out on ep0in len=0/64
> [  193.042297] usb 1-1: khubd timed out on ep0in len=0/64
> [  193.167144] usb 1-1: device descriptor read/64, error -110
> [  193.401550] usb 1-1: new high speed USB device using musb_hdrc and
> address 3
> [  194.401519] usb 1-1: khubd timed out on ep0in len=0/64
> [  195.401580] usb 1-1: khubd timed out on ep0in len=0/64
> [  196.401550] usb 1-1: khubd timed out on ep0in len=0/64
> [  196.526519] usb 1-1: device descriptor read/64, error -110
> [  201.635925] usb 1-1: khubd timed out on ep0in len=0/64
> [  206.634796] usb 1-1: khubd timed out on ep0in len=0/64
> [  211.635955] usb 1-1: khubd timed out on ep0in len=0/64
> [  211.760955] usb 1-1: device descriptor read/64, error -110
> [  211.995300] usb 1-1: new high speed USB device using musb_hdrc and
> address 4
> [  217.970916] musb_h_tx_flush_fifo 126: Could not flush host TX fifo: csr:
> 000a
> [  217.971984] usb 1-1: khubd timed out on ep0out len=0/0
> [  224.158416] musb_h_tx_flush_fifo 126: Could not flush host TX fifo: csr:
> 000a
> [  224.159545] usb 1-1: khubd timed out on ep0out len=0/0
> [  224.370269] usb 1-1: device not accepting address 4, error -110
> [  224.495300] usb 1-1: new high speed USB device using musb_hdrc and
> address 5
> [  230.470764] musb_h_tx_flush_fifo 126: Could not flush host TX fifo: csr:
> 000a
> [  230.471771] usb 1-1: khubd timed out on ep0out len=0/0
> [  236.658264] musb_h_tx_flush_fifo 126: Could not flush host TX fifo: csr:
> 000a
> [  236.659729] usb 1-1: khubd timed out on ep0out len=0/0
> [  236.870330] usb 1-1: device not accepting address 5, error -110
> [  236.870452] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
> [  236.870513] hub 1-0:1.0: port 1 enable change, status 00000501
> [  355.409515] musb_stage0_irq 543: Stopping host session because of babble
> [  367.182983] Unhandled trap: 0x18000010
> </dmesg>

Interesting, I've never seen this error. I'm suspecting there are some
alignment issues going on which then cause USB babble errors.

Could you please increase the musb driver debug level by doing:

# echo 8 > /proc/sysrq-trigger
# echo D3 > /proc/driver/musb_hdrc

And then post the dmesg after plugging in your device.

After that you may want to try to recompile the kernel and leave out
musb DMA support by setting CONFIG_USB_INVENTRA_FIFO in .config. If that
works let me know.

Also please post info on the device you're connecting to the USB port,
such as device model and maybe the relevant part of lsusb -v on your
Linux PC.

Regards,

Tony