linux-kernel - Re: BUG: USB3.0 ?PD720200 complains about over-current

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Date:	Fri, 15 Oct 2010 10:12:17 -0700
From:	Greg KH <greg@...ah.com>
To:	T?nu Samuel <tonu@....ee>, linux-usb@...r.kernel.org
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BUG: USB3.0 ?PD720200 complains about over-current

On Wed, Oct 13, 2010 at 07:01:09PM +0300, T?nu Samuel wrote:
> Hi!
> 
> I know, this is place where only Gods speak and others not. But I am
> sure there is something odd I found and someone here can take care of
> it.

For usb specific stuff like this, try using the
linux-usb@...r.kernel.org mailing list.

> In situation when nothing is connected to any USB ports Ubuntu 10.04.1
> stock kernel complains:
> spider@...der:~$ zcat /var/log/kern.log.2.gz | grep -i current | head
> Sep 29 23:30:12 spider kernel: [    9.048388] hub 8-0:1.0: over-current
> change on port 1
> Sep 29 23:30:12 spider kernel: [    9.152036] hub 8-0:1.0: over-current
> change on port 2
> Sep 29 23:30:12 spider kernel: [    9.256038] hub 8-0:1.0: over-current
> change on port 3
> Sep 29 23:30:12 spider kernel: [    9.360037] hub 8-0:1.0: over-current
> change on port 1
> Sep 29 23:30:12 spider kernel: [    9.464036] hub 8-0:1.0: over-current
> change on port 2
> Sep 29 23:30:12 spider kernel: [    9.570621] hub 8-0:1.0: over-current
> change on port 3
> Sep 29 23:30:12 spider kernel: [    9.672037] hub 8-0:1.0: over-current
> change on port 1
> Sep 29 23:30:12 spider kernel: [    9.776038] hub 8-0:1.0: over-current
> change on port 2
> Sep 29 23:30:12 spider kernel: [    9.880049] hub 8-0:1.0: over-current
> change on port 3
> Sep 29 23:30:13 spider kernel: [    9.984041] hub 8-0:1.0: over-current
> change on port 1
> spider@...der:~$ 
> 
> This runs forever and makes computer busy forever just running those
> messages. I verified same behavior exists with vanilla 2.6.35.7.
> Disabling USB3.0 in BIOS turns off problem and all USB2 ports remain to
> work. So probably this is xHCI driver who complains. I looked bit around
> in source and see it is copied from USB2 code and possibly USB3 has
> something different. I've read USB3 can supply more power, so possibly
> something here has changed.

Do you have the xhci driver loaded for the USB 3.0 controller?

> My hardware:
> 
> Motherboard ASUS M4A88T-I Deluxe
> http://www.asus.com/product.aspx?P_ID=jGAoIFEziW5sPYy7
> 
> it has USB3 chip "NEC D720200F1" on it:
> http://digi.physic.ut.ee/mw/images/d/de/20100926_digi_007.png
> 
> NEC is joined Renesas, so this is his link for datasheet etc:
> http://www2.renesas.com/usb/en/product/upd720200.html
> 
> If you propose patch, I can give him test run.

Any xhci developers have an idea?

thanks,

greg k-h
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