linux-kernel - Re: [PATCH] drm/msm: drop cache sync hack

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Message-ID: <CAF6AEGtK8b9UkbNMJ8VQMv-909fqKk+3LEXsgtuJ_BW0gVK-CA@mail.gmail.com>
Date:   Tue, 25 Aug 2020 07:38:13 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm: drop cache sync hack

On Mon, Aug 24, 2020 at 11:52 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Sat, Aug 22, 2020 at 10:52:54AM -0700, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Now that it isn't causing problems to use dma_map/unmap, we can drop the
> > hack of using dma_sync in certain cases.
>
> Great to see!  What did solve the problems?

should be 0e764a01015dfebff8a8ffd297d74663772e248a ("iommu/arm-smmu:
Allow client devices to select direct mapping")

I still need to confirm whether qcom_iommu needs a similar thing, but
I think it is ok as the iommu phandle link is down one level on the
'mdp' device, rather than attached to the toplevel drm device.

BR,
-R