linux-kernel - Re: [PATCH 1/1] PCI: tune up ICH4 quirk for broken BIOSes

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Message-ID: <4D5112F5.8030700@gmail.com>
Date:	Tue, 08 Feb 2011 10:55:01 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH 1/1] PCI: tune up ICH4 quirk for broken BIOSes

On 01/14/2011 05:10 PM, Bjorn Helgaas wrote:
> On Friday, January 14, 2011 03:31:16 am Jiri Slaby wrote:
>> On 01/14/2011 01:15 AM, Linus Torvalds wrote:
>>> On Thu, Jan 13, 2011 at 3:19 PM, Bjorn Helgaas <bjorn.helgaas@...com> wrote:
>>>>
>>>> I think we're back to the question of why we have the ICH4 quirk in
>>>> the first place, and I don't know the answer to that.
>>>
>>> Iirc, there were several laptops that didn't have the ACPI region
>>> mentioned in any of the regular places, and we'd allocate the PCMCIA
>>> IO region on top of them. The machine would boot, but if anybody ever
>>> inserted a PCCard into the machine, the first access to the IO region
>>> would generally just halt it (because it was trying to read the
>>> PCCard, but the APCI region decodes first, and then the read from that
>>> usually put the CPU in a sleep state that it would never wake up from
>>> for obvious reasons).
>>>
>>> So we do want the ICH4 quirk.
>>
>> Yes, this is an "official" way how ICH4 (and later) advertises the region.
> 
> The quirk is a bug workaround, *not* the "official, planned" way to
> deal with these regions.  The official way is to use ACPI, because
> that's a generic way that doesn't require changes for new versions
> of ICH.

Ok, I understand that. For non-ACPI setups this is probably the only
place to look at.

Anyway, has anybody had a chance to look at the patches? Any comments,
nacks/acks?

https://lkml.org/lkml/2011/1/14/115
https://lkml.org/lkml/2011/1/14/113
https://lkml.org/lkml/2011/1/14/114

thanks,
-- 
js
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