[PATCH 0/2] Add MDSP carveout memory-region support for Q6 APM on Shikra

[Ajay Kumar Nandam]

Unlike most Qualcomm targets where audio runs on the ADSP, the Shikra
target runs its audio use cases on the MDSP. The MDSP operates in an S2
(stage-2) protected/secured memory context, so any buffer shared with
it must reside in a dedicated carveout that is SCM-assigned to the
MDSP's VMID before use. Without this assignment the MDSP cannot access
the buffers and APM communication between APSS and MDSP fails.

This series wires up that flow for the Q6 APM DAI:

Patch 1 documents a new optional "memory-region" property in the
qcom,q6apm-dai binding. It accepts one or more reserved-memory carveout
phandles that get SCM-assigned to the VMIDs listed in "qcom,vmid".
Index 0 is the control-path buffer; subsequent entries are data-path
buffers. The property is only valid together with "qcom,vmid"
(enforced via dependentRequired).

Patch 2 adds a dedicated MDSP carveout reserved-memory region on Shikra,
marks both the existing audio heap and the new MDSP carveout as
shared-dma-pool, and points the Q6 APM DAI node at both regions: index 0
for control-path buffers and index 1 for MDSP data-path buffers. This
provides the secured carveout the MDSP needs once it is SCM-assigned to
its VMID.

Depends-on: https://lore.kernel.org/all/20260609064038.492641-1-ajay.nandam@xxxxxxxxxxxxxxxx/
Depends-on: https://lore.kernel.org/all/20260618112810.2009847-1-ajay.nandam@xxxxxxxxxxxxxxxx/

Ajay Kumar Nandam (2):
  dt-bindings: sound: qcom,q6apm-dai: add memory-region property
  arm64: dts: qcom: shikra: Add MDSP carveout memory and update APM DAIs
    memory regions

 .../bindings/sound/qcom,q6apm-dai.yaml        | 38 +++++++++++++++++--
 arch/arm64/boot/dts/qcom/shikra.dtsi          | 14 ++++++-
 2 files changed, 47 insertions(+), 5 deletions(-)


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2.34.1