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From:   Rob Clark <robdclark@gmail.com>
Date:   Wed, 5 Jun 2019 05:57:16 -0700
Message-ID: <CAF6AEGuj=QmEWZVzHMtoDgO0M0t-W9+tay5F4AKYThZqy=nkdA@mail.gmail.com>
Subject: Re: [Freedreno] [PATCH] of/device: add blacklist for iommu dma_ops
To:     Tomasz Figa <tfiga@chromium.org>
Cc:     freedreno <freedreno@lists.freedesktop.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Frank Rowand <frowand.list@gmail.com>,
        devicetree@vger.kernel.org, David Airlie <airlied@linux.ie>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        Will Deacon <will.deacon@arm.com>,
        Doug Anderson <dianders@chromium.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux IOMMU <iommu@lists.linux-foundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Sean Paul <seanpaul@chromium.org>,
        Vivek Gautam <vivek.gautam@codeaurora.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>
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On Tue, Jun 4, 2019 at 11:58 PM Tomasz Figa <tfiga@chromium.org> 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.

BR,
-R