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

On 2021-05-24 13:03, Lee Jones wrote:

On Wed, 8 Jan 2020 at 09:16, Will Deacon [off-list ref] wrote:

quoted

On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote:

quoted

These patches implements the stream mapping inheritance that's necessary

in

quoted

order to not hit a security violation as the display hardware looses its

stream

quoted

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.

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