Re: [PATCH 2/3] media: iris: Skip SCM call for non-SCM PAS backend

[Sumit Garg]

Hey Konrad,

On Fri, Sep 11, 2026 at 7:54 PM Konrad Dybcio
<konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:
>
> On 9/11/26 2:38 PM, Sumit Garg wrote:
> > From: Jorge Ramirez-Ortiz <jorge.ramirez@xxxxxxxxxxxxxxxx>
> >
> > qcom_scm_mem_protect_video_var() is only serviced by the SCM backend;
> > with OP-TEE the TEE owns secure memory protection. Use
> > qcom_pas_get_backend() to issue the SCM call only for the SCM backend.
> >
> > Assisted-by: Copilot:claude-opus-4.8
> > Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez.ortiz@xxxxxxxxx>
> > Co-developed-by: Sumit Garg <sumit.garg@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxxxxxxxx>
> > ---
>
> [...]
>
> > +     /*
> > +      * qcom_scm_mem_protect_video_var() only applies to the SCM backend;
> > +      * other backends (e.g. OP-TEE) own secure memory protection and do
> > +      * not service this call.
>
> Can you not just stub it out in TF-A then?
>

Please don't, we don't want to support these random SCM calls ABI per
subsystem with the open boot stack. All the config in this case for
video is handled by OP-TEE itself.

Instead we want to mostly support any subsystem specific TZ use-cases
as proper client drivers for the TEE subsystem.

-Sumit