Disable xhci_hcd USB 3.0 module

[Gustavo Duarte]

Greg,


The lspci output is:

ceibal at ceibal:~$ lspci -k

00:00.0 Host bridge: Intel Corporation ValleyView SSA-CUnit (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

00:02.0 VGA compatible controller: Intel Corporation ValleyView Gen7 (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: i915

Kernel modules: i915

00:13.0 SATA controller: Intel Corporation ValleyView 6-Port SATA AHCI
Controller (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: ahci

Kernel modules: ahci

00:14.0 USB controller: Intel Corporation ValleyView USB xHCI Host
Controller (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: xhci_hcd

00:1a.0 Encryption controller: Intel Corporation ValleyView SEC (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

00:1b.0 Audio device: Intel Corporation ValleyView High Definition
Audio Controller (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: snd_hda_intel

Kernel modules: snd-hda-intel

00:1c.0 PCI bridge: Intel Corporation ValleyView PCI Express Root Port (rev 0e)

Kernel driver in use: pcieport

Kernel modules: shpchp

00:1c.1 PCI bridge: Intel Corporation ValleyView PCI Express Root Port (rev 0e)

Kernel driver in use: pcieport

Kernel modules: shpchp

00:1c.2 PCI bridge: Intel Corporation ValleyView PCI Express Root Port (rev 0e)

Kernel driver in use: pcieport

Kernel modules: shpchp

00:1c.3 PCI bridge: Intel Corporation ValleyView PCI Express Root Port (rev 0e)

Kernel driver in use: pcieport

Kernel modules: shpchp

00:1f.0 ISA bridge: Intel Corporation ValleyView Power Control Unit (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

00:1f.3 SMBus: Intel Corporation ValleyView SMBus Controller (rev 0e)

Subsystem: CLEVO/KAPOK Computer Device 5471

01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
Device 5286 (rev 01)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: rtsx_pci

Kernel modules: rtsx_pci

01:00.2 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 06)

Subsystem: CLEVO/KAPOK Computer Device 5471

Kernel driver in use: r8169

Kernel modules: r8169

02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188EE
Wireless Network Adapter (rev 01)

Subsystem: Realtek Semiconductor Co., Ltd. Device 0188

Kernel driver in use: rtl8188ee

Kernel modules: rtl8188ee

===================================================


Seems like here is happening you are saying, one host-controller
(xHCI) manage the three USB port, right ?

May be i have a confusion, and i sorry for that, may be what i am
asking it is impossible or may be is a blunder, any way  following is
my thought:
"
I know that there are several PC, Notebooks with BIOS with the
capability to  enable/disable xHCI USB mode, where you can choice,
xHCI or EHCI.
For this reason i thought that could be possible, instead  by BIOS,
through some kernel configuration or passing a switch parameter at
boot time achieve the same behaviour.
"

Do you are saying that, as this notebook has only one usb
host-controller, these option isn't possible ?

So the only remainder way to resolve this, is trying with a new one kernel ?

Thanks in advance.

Gustavo.

On Mon, Dec 15, 2014 at 3:08 PM, Greg KH <gregkh at linuxfoundation.org> wrote:
> On Mon, Dec 15, 2014 at 02:50:32PM -0200, Gustavo Duarte wrote:
>> Hi Greg,
>>
>> The Notebook has physically 2 port USB 2.0 and one port USB 3.0. The
>> manufacturer specs says that and the output of the command lsusb says
>> the same:
>>
>> $ lsusb
>>
>> Bus 001 Device 002: ID 058f:6254 Alcor Micro Corp. USB Hub
>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>> Bus 001 Device 003: ID 5986:024b Acer, Inc
>
> Note that USB 3 controllers control USB 2 hubs, odds are there is just
> one controller chip in your laptop.
>
> What does 'lspci' show?
>
>> >What type of application isn't compatible with xhci-hcd?  Shouldn't we
>> >fix something like this in the kernel as this isn't a good thing to
>> >have.
>>
>> The app, is a SDK of Robootic kits programming for kids.
>> http://www.lejos.org/nxt/nxj/tutorial/Preliminaries/GettingStartedLinux.htm
>> The bug is on the firmware-library of the SDK, so there isn't to fix
>> on kernel/driver side.
>
> I don't understand, what exact bug is there?
>
>> I'm using the kernel compilde by ubuntu 12.04,
>>
>> $ uname -r
>> 3.8.0-33-generic
>
> Wow that's old and obsolete, sorry, no one can help you with something
> like that here :(
>
> Also, _lots_ of USB 3 bugs have been fixed in the 2 years since that
> kernel was released, please try updating and your issues should be
> resolve.
>
>> And i would like still using that, without recompile it, for this
>> reason is my question, how can i disable xhci_hcd driver without
>> recompile it. ?
>
> You can unbind the driver from the device, but as I say above, I really
> think this driver also controls the USB 2 hubs as well.  The output of
> 'lspci -k' will show this, can you provide the output of that?
>
> thanks,
>
> greg k-h