[meta-freescale] USB issues after moving to linux-fslc-imx_4.1-1.0.x

[Renato Caldas]

Hello all

2016-10-14 7:41 GMT-04:00 Renato Caldas <rm.santos.caldas at gmail.com>:
> Hi Fabio,
>
> Thank you very much for the suggestion!
>
> It doesn't fix the problem, but it modifies it a bit:
>
> If a USB device is plugged in at boot time, the hub still disconnect,
> but after a few messages the reconnection attempts stop:
>
> (...)
> [    7.871127] usb 1-1: device not accepting address 7, error -71
> [    7.877133] systemd[1]: Started Journal Service.
> [    7.994119] usb 1-1: new high-speed USB device number 8 using ci_hdrc
> [    8.036702] systemd-journald[108]: Received request to flush
> runtime journal from PID 1
> [    8.414104] usb 1-1: device not accepting address 8, error -71
> [    8.420157] usb usb1-port1: unable to enumerate USB device
> [    8.840514] random: nonblocking pool is initialized
> ( END )
>
> If on the other end no device is plugged in, the hub now disconnects,
> when it didn't before:
>
> (...)
> [    6.647828] V_5V0_S0: disabling
> [    6.651245] VGEN1: disabling
> [    6.654373] V_2V5_S0: disabling
> [    6.657735] CAN0_EN: disabling
> [    6.660816] CAN1_EN: disabling
> [    6.664139] ALSA device list:
> [    6.667145]   #0: imx-wm8093
> [    6.670215] usb 1-1: USB disconnect, device number 2
> [    6.675217] usb 1-1.1: USB disconnect, device number 3
> [    6.680385]   #1: imx-hdmi-soc
> [    6.691125] VFS: Mounted root (nfs filesystem) on device 0:15.
> [    6.697402] devtmpfs: mounted
> (...)
>
> Cheers,
>   Renato
>
> 2016-10-13 19:28 GMT-04:00 Fabio Estevam <festevam at gmail.com>:
>> Hi Renato,
>>
>> On Thu, Oct 13, 2016 at 7:42 PM, Renato Caldas
>> <rm.santos.caldas at gmail.com> wrote:
>>
>>> If I boot without any usb device connected (apart from the two
>>> internal USB hubs) it boots successfully, but as soon as I plug in a
>>> USB device, I get this:
>>>
>>> [  158.722735] usb 1-1: USB disconnect, device number 2
>>> [  158.727768] usb 1-1.1: USB disconnect, device number 3
>>> [  158.742031] usb usb1-port1: cannot reset (err = -32)
>>> [  158.747696] usb usb1-port1: cannot reset (err = -32)
>>> [  158.753047] usb usb1-port1: cannot reset (err = -32)
>>
>> Does it help if you pass 'usbcore.autosuspend=-1' in the kernel command line?

I think I found a workaround for the issue, I got very suspicious
about the hub disconnecting right after the various regulators were
disabled.

It turns out that if I force the "swbst" regulator(named V_5V0_S0) to
be always enabled (setting regulator-always-on on the dts file),
everything works fine as before. What I don't understand is that this
regulator was disabled on the 3.x kernel, and everything worked fine
still. I really need the schematic for this board...

Another thing that is bothering me is that I don't see any reference
to the "anatop" regulator on the 4.x dmesg... Isn't this regulator
supposed to be detected??

Thanks!!
Cheers,
  Renato