Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb

[Robin Murphy]

On 2021-05-24 13:03, Lee Jones wrote:
> On Wed, 8 Jan 2020 at 09:16, Will Deacon <will@xxxxxxxxxx> wrote:
>
> > On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote:
> > > These patches implements the stream mapping inheritance that's necessary
> > in
> > > order to not hit a security violation as the display hardware looses its
> > stream
> > > mapping during initialization of arm-smmu in various Qualcomm platforms.
> > >
> > > This was previously posted as an RFC [1], changes since then involves the
> > > rebase and migration of the read-back code to the Qualcomm specific
> > > implementation, the mapping is maintained indefinitely - to handle probe
> > > deferring clients - and rewritten commit messages.
> >
> > I don't think we should solve this in a Qualcomm-specific manner. Please
> > can
> > you take a look at the proposal from Thierry [1] and see whether or not it
> > works for you?
>
> Did this or Thierry's solution ever gain traction?
>
> Or are all the parties still 'solving' this downstream?

I think this particular series is what eventually ended up upstream as 
07a7f2caaa5a and f9081b8ff593 (plus a couple of tweaks later). Progress 
is slow on the more general solution, but still happening - I see there 
was a new version recently which I've not had time to properly look at yet.

Robin.