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Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

To: Sergei Shtylyov <>
Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk
From: "Martin K. Petersen" <>
Date: Mon, 25 May 2009 15:10:40 -0400
Cc: Bartlomiej Zolnierkiewicz <>, 胡洪兵 <>,,,, Ralf Baechle <>, IDE/ATA development list <>, Linux Kernel <>, linux-scsi <>, Philippe Vachon <>, Zhang Le <>, Zhang Fuxin <>, Arnaud Patard <>,,, Nicholas Mc Guire <>, Liu Junliang <>, Erwan Lerale <>
In-reply-to: <> (Sergei Shtylyov's message of "Mon, 25 May 2009 23:05:27 +0400")
Organization: Oracle
Original-recipient: rfc822;
References: <> <1243230339.9819.18.camel@localhost.localdomain> <> <> <>
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>>>>> "Sergei" == Sergei Shtylyov <> writes:

>> Could you please explain the issue with platform specific code a bit
>> more?

>> Is it related to a cable detection by any chance?

Sergei>    I guess it's rdmsr()/wrmsr()...

Those are only used when the driver is explicitly loaded with
use_msr=1.  The default is to use PCI config space/VSA.

In any case I have yet to see a CS5536 system whose BIOS sets the cable
detection bit.  If that's the problem I guess we could add a quirk flag
to override the (lack of) BIOS setting.

Martin K. Petersen      Oracle Linux Engineering

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