linux-kernel - Re: [linux-usb-devel] [PATCH] USB BIOS early handoff only when the we the driver is configured

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Message-ID: <46B182AC.3080809@netcom.eu>
Date:	Thu, 02 Aug 2007 09:07:24 +0200
From:	David Engraf <david.engraf@...com.eu>
To:	Greg KH <gregkh@...e.de>
CC:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] [PATCH] USB BIOS early handoff only when the
 we the driver is configured



Greg KH schrieb:
> On Wed, Aug 01, 2007 at 09:21:12AM +0200, David Engraf wrote:
>   
>> At the moment I have a Jetway/VIA Mainboard which seems to have a
>> problem with the handoff.
>> Evenwhen I wait about 20 seconds the EHCI_USBLEGSUP_BIOS flag is not
>> cleared. I think this is a BIOS
>> bug and I will have to talk to Jetway/VIA.
>>     
>
> This sounds like a BIOS bug.
>   
I think so too and I have to talk to Jetway/VIA what there is going wrong.
>   
>> On the other hand, I don't need the EHCI controller in my kernel, so I
>> think the kernel shouldn't take the
>> handover for the EHCI controller like other OS which do not have an usb
>> driver and so don't know that
>> there is a EHCI_USBLEGSUP_BIOS flag which should be cleared.
>>     
>
> We need to do this early to handle a wide range of machines that do very
> nasty things if we do not grab the device as early as possible.  Even if
> we do not ever get around to loading that usb driver.
>
> Yeah, hardware sucks at times :(
>
>   
Ok, but when we don't habe the driver for the usb controller, I think
the BIOS should control it because
maybe the BIOS found for example a keyboard or mouse and emulates it as
an PS2 keayboard/mouse,
so we could use it without the usb driver. I think that's why they
developed the handoff feature.
Are there any known hardware which has problems when we disable the handoff?

> thanks,
>
> greg k-h
>   

Thanks

 
David Engraf

 

 
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