linux-kernel - Re: [GIT PULL] memory: Tegra memory controller for v5.14

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Date:   Tue, 8 Jun 2021 16:38:48 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Will Deacon <will@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        arm@...nel.org, soc@...nel.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jon Hunter <jonathanh@...dia.com>,
        Nicolin Chen <nicolinc@...dia.com>,
        Krishna Reddy <vdumpa@...dia.com>, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        Dmitry Osipenko <digetx@...il.com>
Subject: Re: [GIT PULL] memory: Tegra memory controller for v5.14

On Tue, Jun 08, 2021 at 01:01:29PM +0100, Will Deacon wrote:
> Hi Krzysztof, Thierry,
> 
> On Mon, Jun 07, 2021 at 10:49:10AM +0200, Krzysztof Kozlowski wrote:
> > Hi Thierry and Will,
> > 
> > This is the pull for you to base further SMMU aptches (prevent early SMMU
> > faults).
> 
> This is a tonne of code for me to pull into the SMMU tree given that I only
> want one patch!
> 
> Thierry, if I just stick:
> 
> https://lore.kernel.org/r/20210603164632.1000458-4-thierry.reding@gmail.com
> 
> on its own branch, can you stitch together whatever you need?

I'm not sure I understand what you're proposing. For reference, here's
the set of patches that I sent out:

  1. memory: tegra: Implement SID override programming
  2. dt-bindings: arm-smmu: Add Tegra186 compatible string
  3. iommu/arm-smmu: Implement ->probe_finalize()
  4. iommu/arm-smmu: tegra: Detect number of instances at runtime
  5. iommu/arm-smmu: tegra: Implement SID override programming
  6. iommu/arm-smmu: Use Tegra implementation on Tegra186
  7. arm64: tegra: Use correct compatible string for Tegra186 SMMU
  8. arm64: tegra: Hook up memory controller to SMMU on Tegra186
  9. arm64: tegra: Enable SMMU support on Tegra194

Krzysztof already picked up patch 1 and I was assuming that you'd pick
up 2-6 because they are to the ARM SMMU driver. However, if you're
primarily interested in just patch 3, which is more "core" ARM SMMU than
the rest, which are Tegra-specific, then I suppose what we could do is
for you to give an Acked-by on the rest (2, 4-6) and then Krzysztof or I
can pick them up and take them via ARM SoC, based on the stable branch
from your tree that only has patch 3.

Patch 6 touches arm-smmu-impl.c, though it's a two-line change that
touches only the Tegra-specific matching bit in arm_smmu_impl_init(), so
the likelihood of that conflicting with anything else is fairly small.

Is that what you were proposing?

Thierry

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