linux-kernel - Re: [PATCH 0/3] x86, usb, pci: Disable usb legacy support early

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Date:	Mon, 10 Jan 2011 10:27:59 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Greg KH <greg@...ah.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: Re: [PATCH 0/3] x86, usb, pci: Disable usb legacy support early

On Mon, 10 Jan 2011 07:57:24 -0800
Greg KH <greg@...ah.com> wrote:

> On Sun, Jan 09, 2011 at 11:58:58AM -0800, Yinghai Lu wrote:
> > move quirks for usb handoff early for x86.
> > 
> > So we can get stable result when trying to calibrate apic timer with pm-timer.
> 
> Is this a real problem today?  What is the symptom of the issue?  Where
> was it reported as a problem?

Yes, please give us a rationale for all this mess.  I really don't like
the sleep wrappers or the "early" PCI device; would it be easier to
extract some of the core disabling MMIO from the quirks and re-use it
for a totally separate set of early quirk functions?  Like Ben
suggested, making it totally arch specific would be a good option,
though presumably most arches don't need this (again if you explained
why/when this was needed maybe we could come up with a better
solution, or just ignore the problem if you're trying to fix a
pre-production board again with all sorts of broken stuff).

-- 
Jesse Barnes, Intel Open Source Technology Center
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