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Message-ID: <20210330093432.GB5281@willie-the-truck>
Date: Tue, 30 Mar 2021 10:34:33 +0100
From: Will Deacon <will@...nel.org>
To: Rob Clark <robdclark@...il.com>
Cc: Eric Anholt <eric@...olt.net>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
freedreno <freedreno@...ts.freedesktop.org>,
Sean Paul <sean@...rly.run>,
Jordan Crouse <jcrouse@...eaurora.org>,
Robin Murphy <robin.murphy@....com>,
Rob Herring <robh+dt@...nel.org>,
Joerg Roedel <joro@...tes.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] iommu/arm-smmu-qcom: Skip the TTBR1 quirk for db820c.
On Mon, Mar 29, 2021 at 09:02:50PM -0700, Rob Clark wrote:
> On Mon, Mar 29, 2021 at 7:47 AM Will Deacon <will@...nel.org> wrote:
> >
> > On Fri, Mar 26, 2021 at 04:13:02PM -0700, Eric Anholt wrote:
> > > db820c wants to use the qcom smmu path to get HUPCF set (which keeps
> > > the GPU from wedging and then sometimes wedging the kernel after a
> > > page fault), but it doesn't have separate pagetables support yet in
> > > drm/msm so we can't go all the way to the TTBR1 path.
> >
> > What do you mean by "doesn't have separate pagetables support yet"? The
> > compatible string doesn't feel like the right way to determine this.
>
> the compatible string identifies what it is, not what the sw
> limitations are, so in that regard it seems right to me..
Well it depends on what "doesn't have separate pagetables support yet"
means. I can't tell if it's a hardware issue, a firmware issue or a driver
issue.
Will
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