linux-kernel - Re: [PATCH] iommu/intel: disable DMAR for g4x integrated gfx

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Message-ID: <1358795028.5523.6.camel@shinybook.infradead.org>
Date:	Mon, 21 Jan 2013 13:03:48 -0600
From:	David Woodhouse <dwmw2@...radead.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	"Sankaran, Rajesh" <rajesh.sankaran@...el.com>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Adam Jackson <ajax@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH] iommu/intel: disable DMAR for g4x integrated gfx

On Sun, 2013-01-20 at 23:50 +0100, Daniel Vetter wrote:
> DMAR support on g4x/gm45 integrated gpus seems to be totally busted.
> So don't bother, but instead disable it by default to allow distros to
> unconditionally enable DMAR support.

Acked-By: David Woodhouse <David.Woodhouse@...el.com>

It *really* winds me up that we never bother to test this hardware
before we ship it.

But I'm even *more* disappointed that we can't even diagnose it and
publish coherent errata *after* the fact. I'd really like to see each
quirk which disables features referencing a specific published erratum.
We really ought to be able to manage at least *that* much.

Rajesh?

-- 
dwmw2


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