linux-kernel - Re: [PATCH 2/2] ahci: only attach ICH6-M if it's in SATA mode

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Date:	Mon, 16 Dec 2013 21:47:32 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Levente Kurusa <levex@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ahci: only attach ICH6-M if it's in SATA mode

On Mon, 2013-12-16 at 18:28 +0100, Levente Kurusa wrote:
> Not only they use different class IDs, but IIRC they also change device ids.
> For example, ICH7M was 0x27C4 in AHCI mode and 0x27DF in IDE mode. (obviously
> Intel vendor ids)

Apparently ICH6-M always uses device ID 0x2653 for its SATA "function"
(whether in SATA mode or in IDE mode).

> Paul, did this patch change anything noticeable for you? I mean was there any
> problem before that this patch fixes or not?

What triggered these two patches was the warning I quoted in patch 1/2
(which Tejun already queued). Looking at the code involved raised the,
obvious, question why ahci bothers to attach to ICH6-M in IDE mode.
Anyhow, the only problem is that it unsuccessfully probes when ICH6-M is
in IDE mode. The probe doesn't break things, as far as I can tell.

Paul Bolle

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