Re: DWC3: Clock Domain Crossing erratum description.

[Kirill Dronov <cyrill.dronov@xxxxxxxxx>]

Hi Felipe,
On 04/07/2016 08:10 AM, Felipe Balbi wrote:
> Hi,
>
> Kirill Dronov <cyrill.dronov@xxxxxxxxx> writes:
> > I'm working on USB device bringup on Intel E3800 – based board. DWC3
> > core configured as DRD in device mode. The only connected device phy
> > is SMSC 3310 (USB2 ULPI). DWC3 core version is 2.10A. Gadget zero
> > driver can be loaded, but device enumeration fails: device is detected
> > by host, speed is negotiated (HS), host successfully reset device. On
> > device side – conndone interrupt is followed by linksts change with
> > link_state 0.  Then host sends USBREQ_GET_DESCRIPTOR and tries to set
> > address but device does not react – no events generated.
> which kernel are you using ?
It's 3.14.29 kernel (WindRiver Linux). I have backported dwc3 upstream 
patches up to ~v3.17-rc4 (+ all trace patches). But the same issue 
exists for original 3.14.29 kernel.

> Please collect driver traces and send them
> to us:
>
> # mount -t debugfs none /sys/kernel/debug
> # cd /sys/kernel/debug/tracing
> # echo 2048 > buffer_size_kb
> # echo 1 > events/dwc3/enable
>
> (now trigger the problem)
>
> # cp trace /path/to/non/volatile/media/
>
> Send that trace file (you need to compress it, probably)
I've attached both dev_dbg and trace outputs. Also attached regdump 
taken after enumeration failed and gzero is suspended.
> > I'm not sure if I hit “run/stop metastability” issue [“STAR#9000525659:
> > Clock Domain Crossing on DCTL in USB 2.0 Mode”]. I don't have DWC3
> we have a workaround for that, you shouldn't hit it unless you removed
> the workaround.
No, I didn't.
> > databook or erratum description (other than mentioned in driver code).
> > Can somebody provide more detailed description of STAR#9000525659?
> > Where can I get DWC3 Databook?
> you need to talk to a Synopsys representative for that.
Unfortunately Synopsis points out to Intel as SoC manufacturer and Intel 
share only short notes on driver configuration and loading - no Databook.
--
regards,
Kirill

Attachment: dwc3.dev_dbg.tgz
Description: application/compressed-tar

Attachment: dwc3.trace.tgz
Description: application/compressed-tar

Attachment: dwc3.regdump.tgz
Description: application/compressed-tar