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

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Message-ID: <CAD=FV=W_SEGMMY-+gezfnAsujO34YxQg0MsYKvVkEAFKNFB+rA@mail.gmail.com>
Date:	Wed, 11 Nov 2015 20:46:05 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	John Youn <John.Youn@...opsys.com>
Cc:	Yunzhi Li <lyz@...k-chips.com>, Julius Werner <jwerner@...gle.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	wulf <wulf@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	caesar <caesar.wang@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	rockchip-discuss <rockchip-discuss@...omium.org>
Subject: Re: [RFC] usb: dwc2: hcd: fix split schedule issue

John,

On Wed, Nov 11, 2015 at 8:29 PM, John Youn <John.Youn@...opsys.com> 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
<https://chromium-review.googlesource.com/#/c/312160/>.

I'll keep digging tomorrow, too.

-Doug
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