linux-kernel - Re: [BISECTED] pata_jmicron: no drives found on post 2.6.25 kernels

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Message-ID: <courier.4834448B.00007204@fs.ru.acad.bg>
Date:	Wed, 21 May 2008 18:49:31 +0300
From:	Plamen Petrov <pvp-lsts@...ru.acad.bg>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Luca Tettamanti <kronos.it@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [BISECTED] pata_jmicron: no drives found on post 2.6.25
  kernels

Shaohua Li написа: 

> On Tue, 2008-05-20 at 19:09 +0300, Plamen Petrov wrote:
>> Shaohua Li написа:  
>> 
>> > On Tue, 2008-05-20 at 01:37 +0300, Plamen Petrov wrote:
>> >> Hello, folks!  
>> >> 
>> >> After 2.6.26 merge window opened, the optical drives in my
>> >> computer, hanging off a JMicron controler were not detected
>> >> by linux any more.  
>> >> 
>> >> Luca Tettamanti reported similar troubles:
>> >> http://marc.info/?l=linux-kernel&m=120958791323911&w=2  
>> >> 
>> >> Its been 20 days, so I decided to bisect.
>> >> git bisect revealed that commit
>> >> 7d715a6c1ae5785d00fb9a876b5abdfc43abc44b
>> >> is the one causing pata_jmicron to fail to detect drives,
>> >> connected to the JMicron controler on my motherboard.
>> >> At least in my case, anyway...
>> >> Changing kernel config to CONFIG_PCIEASPM=n makes the drives
>> >> attached to the JMicron SATA/PATA controller usable again. 
>> > When you enable this option, did you change any ASPM policy? By default,
>> > we are using the BIOS setting, so it shouldn't change any thing. 
>> >  
>> 
>> No, I did not change any ASPM policy, mainly because I do not how.  
>> 
>> > Also can you please send me the 'lspci -vvvxxxx' output with/without the
>> > ASPM enabled? 
>> > 
> Can you please try below patch?
> The Slot 03:00.* of JMicron controller has two functions, but one is
> PCIE endpoint the other isn't PCIE device, very strange. PCIE spec
> defines all functions should have the same config for ASPM, so disable
> ASPM for the whole slot in this case. 
> 

With the provided patch applied on top of latest git tree, the optical
drive connected to the JMicron controller WORKS with CONFIG_PCIEASPM=y. 

Just in case - this is on a Gigabyte GA-P35-DS3R v2.1 motherboard,
BIOS F11. 

Thanks! 


Plamen Petrov, network & system administrator
Filial - Silistra
RU "Angel Kantchev"
http://fs.ru.acad.bg/
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