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Date:   Wed, 5 Jun 2019 15:18:10 +0200
From:   Marek Szyprowski <>
To:     Rob Clark <>, Tomasz Figa <>
Cc:     freedreno <>,
        Daniel Vetter <>,
        Frank Rowand <>,, David Airlie <>,
        linux-arm-msm <>,
        Will Deacon <>,
        Doug Anderson <>,
        dri-devel <>,
        "" <>,
        Linux IOMMU <>,
        Rob Herring <>,
        Sean Paul <>,
        Vivek Gautam <>,
        Robin Murphy <>,
        Christoph Hellwig <>
Subject: Re: [Freedreno] [PATCH] of/device: add blacklist for iommu dma_ops

Hi Rob,

On 2019-06-05 14:57, Rob Clark wrote:
> On Tue, Jun 4, 2019 at 11:58 PM Tomasz Figa <> wrote:
>> But first of all, I remember Marek already submitted some patches long
>> ago that extended struct driver with some flag that means that the
>> driver doesn't want the IOMMU to be attached before probe. Why
>> wouldn't that work? Sounds like a perfect opt-out solution.
> Actually, yeah.. we should do that.  That is the simplest solution.

Tomasz has very good memory. It took me a while to find that old patches:

It looks that my idea was a bit ahead of its time ;)

Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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