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Date:   Tue, 22 Jan 2019 12:01:09 +0100
From:   Joerg Roedel <>
To:     Daniel Vetter <>
Cc:     Eric Wong <>,
        Joonas Lahtinen <>,
        David Woodhouse <>,
        David Airlie <>,
        Jani Nikula <>,
        Rodrigo Vivi <>,
        " DRIVERS <>, Joerg
        Roedel <>," <>,
        intel-gfx <>,
        dri-devel <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH] iommu/intel: quirk to disable DMAR for QM57 igfx

Hi Daniel,

On Tue, Jan 22, 2019 at 11:46:39AM +0100, Daniel Vetter wrote:
> Note that the string of platforms which have various issues with iommu
> and igfx is very long, thus far we only disabled it where there's no
> workaround to stop it from hanging the box, but otherwise left it
> enabled. So if we make a policy change to also disable it anywhere
> where it doesn't work well (instead of not at all), there's a pile
> more platforms to switch.

I think its best to just disable iommu for the igfx devices on these
platforms. Can you pick up Eric's patch and extend it with the list of
affected platforms?



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