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: <Pine.LNX.4.44L0.0708011038130.3764-100000@iolanthe.rowland.org>
Date:	Wed, 1 Aug 2007 10:40:49 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	David Engraf <david.engraf@...com.eu>
cc:	linux-kernel@...r.kernel.org, <linux-pci@...ey.karlin.mff.cuni.cz>,
	<gregkh@...e.de>, <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] [PATCH] USB BIOS early handoff only when the
 we the driver is configured

On Wed, 1 Aug 2007, David Engraf wrote:

> At the moment I have a Jetway/VIA Mainboard which seems to have a problem
> with the handoff. Even
> when 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.

I have the same problem on my Intel motherboard.  Which is surprising, 
considering that Intel invented the BIOS-handoff technique.

> 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.

There ought to be a solution to satisfy everybody.  For instance, you 
could add a Kconfig flag for enabling USB handoff, and make it be 
selected automatically if any of the PCI USB drivers are configured.

Alan Stern

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