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

[Thierry Reding <thierry.reding@gmail.com>]

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On Thu, Jun 10, 2021 at 04:23:56PM +0200, Krzysztof Kozlowski wrote:
> On 10/06/2021 11:19, Thierry Reding wrote:
> > On Tue, Jun 08, 2021 at 05:48:51PM +0100, Will Deacon wrote:
> >> On Tue, Jun 08, 2021 at 04:38:48PM +0200, Thierry Reding wrote:
> >>> On Tue, Jun 08, 2021 at 01:01:29PM +0100, Will Deacon wrote:
> >>>> On Mon, Jun 07, 2021 at 10:49:10AM +0200, Krzysztof Kozlowski wrote:
> >>>>> 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.
> >>
> >> I think you previously said that patch 5 depends on patch 1, so I can't
> >> take 2-6 without also pulling in the memory controller queue.
> >>
> >>> 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?
> >>
> >> I can queue as much or as little of 2-6 as you like, but I would like to
> >> avoid pulling in the memory controller queue into the arm smmu tree. But
> >> yes, whichever of those I take, I can put them on a separate branch so
> >> that you're not blocked for the later patches.
> >>
> >> You have a better handle on the dependencies, so please tell me what works
> >> for you. I just want to make sure that at least patch 3 lands in my tree,
> >> so we don't get late conflicts with other driver changes.
> > 
> > Yes, if you could pick up patch 3 and send out a link with the stable
> > branch, I think Krzysztof or I could pull in that branch and pick up the
> > remaining patches. It'd be good if you could also ack the remaining SMMU
> > patches so that ARM SoC knows that they've been sanctioned.
> > 
> > Krzysztof: would you be okay with picking up patches 2 and 4-6 on top of
> > your memory branch for v5.14?
> 
> You mean the iommu patches? Yes, I can take them and later explain to
> Arnd/Olof why they come through me.

Okay, great.

Will, can you provide that stable branch? Or would you prefer if I
prepared it and sent you a pull request? We're kind of running out of
time, since for ARM SoC the cut-off point for new material is usually
-rc6 and that's coming up pretty fast.

Thierry

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