Re: [RFC] usb: dwc2: hcd: fix split schedule issue

From: Doug Anderson
Date: Wed Nov 11 2015 - 23:46:12 EST


On Wed, Nov 11, 2015 at 8:29 PM, John Youn <John.Youn@xxxxxxxxxxxx> wrote:
> I also feel it is not quite right as the SSPLIT should be able to
> happen during the SSPLIT of another device. I tried to reproduce
> and see the same scheduling but don't see any hang due to it.
> Yunzhi, any details on what kind of hub and keyboard you are
> using? I have the same Jabra 410 speaker.

I saw it with a standard Logitech mouse. It wasn't a hang, but the
mouse effectively became non-functional (behaved like it hung) when
you started playing audio. Once the audio stream stopped, the mouse
would work again. I was using the same Jabra 410 as well.

/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 6, If 0, Class=Human Interface Device,
Driver=usbhid, 1.5M
|__ Port 3: Dev 5, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 5, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 5, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 5, If 3, Class=Human Interface Device, Driver=, 12M

Bus 002 Device 005: ID 0b0e:0412 GN Netcom
Bus 002 Device 006: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 002 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

We've also had some discussion of this patch in our bug tracker at

I'll keep digging tomorrow, too.

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