linux-kernel - Re: ICH8 CF timeout (regression)...

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Message-ID: <46B41706.4080008@gmail.com>
Date:	Sat, 04 Aug 2007 15:04:54 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Daniel J Blueman <daniel.blueman@...il.com>
CC:	Mark Lord <lkml@....ca>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: Re: ICH8 CF timeout (regression)...

Daniel J Blueman wrote:
> Tejun,
> 
> On 03/08/07, Tejun Heo <htejun@...il.com> wrote:
>> Daniel J Blueman wrote:
>>> The ICH8 south-bridge I have is the mobile variant and does come
>>> equipped with native parallel IDE - see page 447:
>>> http://download.intel.com/design/chipsets/datashts/31305603.pdf . I do
>>> see 35MB/s with DMA enabled from my CF on the 1 in 15 times the
>>> libata-kernel does work.
>>>
>>> I can dump off and decode the configuration registers for the timing
>>> and bus master registers in the working and non-working libata cases,
>>> and the legacy ATA working case and see what's different.
>> Does the attached patch change anything?
> 
> This addresses the issue 100%!
> 
> Due to the differences between the ICH8 non-mobile and mobile
> variants, I've cooked the change into a new initialisation structure
> for the ICH8M in the attached patch, if that helps at all.
> 
> The changes thus affect (correct) behaviour on the ICH8M in IDE mode
> only...so should be safe for inclusion. There may be a similar
> situation with ICH9Ms also.

[cc'ing Kristen, hello]

I think [P0 P2 IDE IDE] is correct for MAP 01b but can't find anything
about it in the datasheet or spec update.  Kristen, can you please
verify this.  The following bug is also fixed by using [P0 P2 IDE IDE].

http://bugzilla.kernel.org/show_bug.cgi?id=8809

Thanks.

-- 
tejun
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