[Letux-kernel] Minor annoyances with USB(3) port on Pyra

[H. Nikolaus Schaller]

Hi Tony,
I have seen two small issues:

a) USB client mode works fine, except that on first plug in
   of the cable I see NOHZ warnings (which seem to be harmless):

> dhcpcd[2317]: version 6.0.5 starting
> dhcpcd[2317]: wlan0: waiting for carrier
> dhcpcd[2317]: usb0: waiting for carrier
> dhcpcd[2317]: wlan0: carrier acquired
> dhcpcd[2317]: wlan0: carrier lost
> dhcpcd[2317]: wlan0: waiting for carrier
> [   23.626353] wlcore: down
> [   46.919138] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
> [   47.285640] bq24296: VBUS became available
> [   47.290052] bq24296_update_input_current_limit(6)
> [   48.531529] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
> [   48.593338] NOHZ: local_softirq_pending 08
> [   48.826821] NOHZ: local_softirq_pending 08
> [   48.987261] NOHZ: local_softirq_pending 08
> [   49.288690] NOHZ: local_softirq_pending 08
> [   49.381113] NOHZ: local_softirq_pending 08
> [   49.610246] NOHZ: local_softirq_pending 08
> [   49.774833] NOHZ: local_softirq_pending 08
> [   49.888948] NOHZ: local_softirq_pending 08
> [   50.143018] NOHZ: local_softirq_pending 08
> [   50.168652] NOHZ: local_softirq_pending 08
> dhcpcd[2317]: timed out
> dhcpcd[2317]: allowing 8 seconds for IPv4LL timeout
> dhcpcd[2317]: usb0: carrier acquired
> dhcpcd[2317]: usb0: soliciting an IPv6 router
> dhcpcd[2317]: usb0: using IPv4LL address 169.254.83.144
> dhcpcd[2317]: usb0: adding host route to 169.254.83.144 via 127.0.0.1
> dhcpcd[2317]: usb0: adding route to 169.254.0.0/16
> dhcpcd[2317]: forked to background, child pid 2812
> [FAIL] startpar: service(s) returned failure: isc-dhcp-server ... failed!
> 
> Debian GNU/Linux 8 letux console
> 
> letux login: root
> Password: 

It is the same on omap5uevm:

> root at letux:~# [ 2858.377258] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
> [ 2859.205770] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
> [ 2859.279922] NOHZ: local_softirq_pending 08
> [ 2859.481076] NOHZ: local_softirq_pending 08
> [ 2859.800392] NOHZ: local_softirq_pending 08
> [ 2859.913331] NOHZ: local_softirq_pending 08
> [ 2860.052946] NOHZ: local_softirq_pending 08
> [ 2860.232251] NOHZ: local_softirq_pending 08
> [ 2860.280545] NOHZ: local_softirq_pending 08
> [ 2860.445238] NOHZ: local_softirq_pending 08
> [ 2860.541821] NOHZ: local_softirq_pending 08
> [ 2860.808122] NOHZ: local_softirq_pending 08
> 
> root at letux:~# [ 2872.169307] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
> 


b) OTG mode detects cable plugin (extcon) and turns on power
   but dwc3 does not try to find the connected device

> root at letux:~# [  692.970418] bq24296: VBUS became unavailable
> [  850.289966] bq24296_otg_is_enabled(1)
> [  850.294997] bq24296_otg_enable(1)
> [  858.377691] bq24296_otg_disable(1)
> [  864.544944] bq24296_otg_is_enabled(1)
> [  864.549017] bq24296_otg_enable(1)
> [  866.834895] bq24296_otg_disable(1)
> 


Same on omap5uevm (just power can be measured, not the bq24296 printk of course).

Any ideas how to fix / debug?

BR and thanks,
Nikolaus