Re: [PATCH v1] ASoC: qcom: q6apm-dai: add carveout SCM assignment for mDSP buffers

Mark Brown <[email protected]> Sat, 1 Aug 2026 00:15:28 +0100

Newsgroups	org.kernel.vger.linux-sound,org.kernel.vger.linux-arm-msm,org.kernel.vger.linux-kernel
Message-ID	<[email protected]>

On Thu, Jun 18, 2026 at 04:58:10PM +0530, Ajay Kumar Nandam wrote:
> On targets like Shikra where audio processing runs on the mDSP
> (modem DSP) instead of the ADSP, the DSP operates with stage-2
> secured memory. Unlike ADSP platforms where SMMU-mapped system RAM
> is directly accessible, mDSP cannot access buffers unless they are
> explicitly SCM-assigned to the appropriate VMIDs. This requires
> allocating PCM DMA buffers from reserved carveout regions and
> performing SCM assignment to grant both HLOS and the mDSP shared
> RW access.

> Depends-on: https://lore.kernel.org/all/[email protected]/

Please resend when the dependencies have been applied, I'm spending far
too much time repeatedly checking if any of these things can be applied.

Please include human readable descriptions of things like commits and
issues being discussed in e-mail in your mails, this makes them much
easier for humans to read especially when they have no internet access.
I do frequently catch up on my mail on flights or while otherwise
travelling so this is even more pressing for me than just being about
making things a bit easier to read.

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