From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Dave Jones <davej@redhat.com>
Cc: gboyce <gboyce@badbelly.com>, linux-kernel@vger.kernel.org
Subject: Re: IDE + CPU Scaling problem on Via EPIA systems
Date: Sun, 04 Dec 2005 16:22:03 +0000 [thread overview]
Message-ID: <1133713324.3168.3.camel@localhost> (raw)
In-Reply-To: <20051128063212.GA18775@redhat.com>
On Llu, 2005-11-28 at 01:32 -0500, Dave Jones wrote:
> On some variants of the VIA C3, we need to quiesce all DMA operations
> before we do a speed transition. We currently don't do that.
> I do have a patch from someone which adds support in the longhaul
> driver to wait for IDE transactions to stop, but to do it cleanly,
> we really need some callbacks into the IDE layer.
I was under the impression you could turn the IO/MEM enable on the root
bridge off momentarily to get the needed DMA pause safely ? Or does it
abort rather than retry at that point ?
next prev parent reply other threads:[~2005-12-06 15:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-28 5:02 IDE + CPU Scaling problem on Via EPIA systems gboyce
2005-11-28 6:32 ` Dave Jones
2005-12-04 16:22 ` Alan Cox [this message]
2005-12-06 17:05 ` Dave Jones
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