linux-kernel - Re: sata dvdroms fails to be recognized by MCP55 controller with the 2.6.26.5 kernel

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Message-ID: <48E71AEC.8020701@gmail.com>
Date:	Sat, 04 Oct 2008 16:27:40 +0900
From:	Tejun Heo <htejun@...il.com>
To:	gettinther <gettinther@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: sata dvdroms fails to be recognized by MCP55 controller with
 the 2.6.26.5 kernel

(restoring lkml and linux-ide.  please don't drop cc list)

Tejun Heo wrote:
> Hello,
> 
> gettinther wrote:
>> 00:05.2 IDE interface: GeForce 8800 GT 512 MCP55 SATA Controller (rev
>> a2) (prog-if 85 [Master SecO PriO])
> 
> Ah.. okay.  MCP55.  I've missed that part in the first message.
> sata_nv is a bit messed up for 2.6.26.  What happened was...
> 
> * During 2.6.26-rc, libata switched to prefer hardreset over softreset
>   for various reasons.
> 
> * After 2.6.26 release, sata_nv generic flavors (MCP55/66) were
>   reported to have problems probing devices with hardreset.  Hardreset
>   simply doesn't work.
> 
> * Patch posted to disable hardreset for generic but it accidentally
>   disabled hardreset for all flavors (generic/nf2/3/ck804).
> 
> * Which broke ck804.
> 
> * Another patch posted to reinstate hardreset for nf2/3 and ck804.
> 
> * It somehow mysteriously broke nf2/3.  This is still being
>   investigated.
> 
> Sorry about the mess but I am puzzled too.  I'll report back when I
> know more.
> 
> Thanks.
> 


-- 
tejun
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