linux-kernel - Re: [PATCH 4/5] dt-bindings: memory: tegra: Add missing swgroups

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Date:   Tue, 27 Oct 2020 13:55:06 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Nicolin Chen <nicoleotsuka@...il.com>, robh+dt@...nel.org,
        jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] dt-bindings: memory: tegra: Add missing swgroups

On Mon, Oct 26, 2020 at 09:17:58PM +0100, Krzysztof Kozlowski wrote:
> On Fri, Oct 09, 2020 at 08:52:18AM -0700, Nicolin Chen wrote:
> > On Fri, Oct 09, 2020 at 02:21:10PM +0200, Thierry Reding wrote:
> > > On Wed, Oct 07, 2020 at 05:37:45PM -0700, Nicolin Chen wrote:
> > > > According to Tegra X1 TRM, there are missing swgroups in the
> > > > tegra210_swgroups list. So this patch adds them in bindings.
> > > > 
> > > > Note that the TEGRA_SWGROUP_GPU (in list) should be actually
> > > > TEGRA_SWGROUP_GPUB (in TRM), yet TEGRA_SWGROUP_GPU (in TRM)
> > > > is not being used -- only TEGRA_SWGROUP_GPUB (in TRM) is. So
> > > > this patch does not add TEGRA_SWGROUP_GPU (in TRM) and keeps
> > > > TEGRA_SWGROUP_GPU (in list) as it is.
> > > > 
> > > > Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> > > > ---
> > > >  include/dt-bindings/memory/tegra210-mc.h | 10 ++++++++++
> > > >  1 file changed, 10 insertions(+)
> > > > 
> > > > diff --git a/include/dt-bindings/memory/tegra210-mc.h b/include/dt-bindings/memory/tegra210-mc.h
> > > > index c226cba9e077..f9fcb18a6d9b 100644
> > > > --- a/include/dt-bindings/memory/tegra210-mc.h
> > > > +++ b/include/dt-bindings/memory/tegra210-mc.h
> > > > @@ -33,6 +33,16 @@
> > > >  #define TEGRA_SWGROUP_AXIAP	28
> > > >  #define TEGRA_SWGROUP_ETR	29
> > > >  #define TEGRA_SWGROUP_TSECB	30
> > > > +#define TEGRA_SWGROUP_NV	31
> > > > +#define TEGRA_SWGROUP_NV2	32
> > > > +#define TEGRA_SWGROUP_PPCS1	33
> > > > +#define TEGRA_SWGROUP_DC1	34
> > > > +#define TEGRA_SWGROUP_PPCS2	35
> > > > +#define TEGRA_SWGROUP_HC1	36
> > > > +#define TEGRA_SWGROUP_SE1	37
> > > > +#define TEGRA_SWGROUP_TSEC1	38
> > > > +#define TEGRA_SWGROUP_TSECB1	39
> > > > +#define TEGRA_SWGROUP_NVDEC1	40
> > > 
> > > I'm not sure this is right. The existing list is based on "Table 4:
> > > Client to Software Name Mapping" from page 28 of the Tegra X1 TRM, and
> > > none of these new swgroups seem to be present in that table.
> > 
> > I went through all the MC_SMMU_XX_ASID_0 registers. All of
> > them have their own ASID registers that I added in PATCH-5.
> 
> Thierry,
> 
> Any follow ups on this topic? Does it require a fix or looks correct?

This does indeed look correct, based on what registers exist for these.
It'd be good to know how Nicolin expects these to be used, since these
are currently not listed in device tree. There's certainly some like
TSEC or NVDEC that we don't support (yet) upstream, but things like DC1
and HC1 already have equivalents that we use, so I'm not sure how we'll
integrate these new ones.

I suppose it doesn't really matter if any of these end up being unused,
so:

Acked-by: Thierry Reding <treding@...dia.com>

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