From: Krzysztof Kozlowski <krzk@kernel.org>
To: Ajay Kumar Nandam <ajay.nandam@oss.qualcomm.com>
Cc: Srinivas Kandagatla <srini@kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v6 3/4] ASoC: dt-bindings: qcom,q6apm-dai: add memory-region and relax iommus
Date: Mon, 28 Sep 2026 12:50:14 +0200 [thread overview]
Message-ID: <20260928-cute-vengeful-pigeon-e4bbfa@quoll> (raw)
In-Reply-To: <20260923-vmid-v4-v6-3-3d61a0319b1c@oss.qualcomm.com>
On Wed, Sep 23, 2026 at 10:03:40PM +0530, Ajay Kumar Nandam wrote:
> On modem-DSP (mDSP) platforms the DSP runs in a stage-2 protected
> context and cannot use the SMMU. PCM buffers must live in reserved-memory
> carveouts that are SCM-assigned to the appropriate VMIDs.
>
> Add a memory-region property (1-2 entries) for the control-path and
> data-path carveouts, and require q6apm-dais nodes to describe exactly
> one access path: iommus for SMMU-backed systems or memory-region for
> mDSP systems. Remove iommus from the common required list since mDSP
> platforms have neither IOMMU nor VMID DT properties.
>
> Signed-off-by: Ajay Kumar Nandam <ajay.nandam@oss.qualcomm.com>
> ---
> .../devicetree/bindings/sound/qcom,q6apm-dai.yaml | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Best regards,
Krzysztof
next prev parent reply other threads:[~2026-09-28 10:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-23 16:33 [PATCH v6 0/4] ASoC: qcom: enable audio on stage-2 protected DSPs (mDSP) Ajay Kumar Nandam
2026-09-23 16:33 ` [PATCH v6 1/4] ASoC: qcom: q6apm: clear g_apm on driver removal Ajay Kumar Nandam
2026-09-23 16:33 ` [PATCH v6 2/4] ASoC: qcom: qdsp6: generalize GPR service domain Ajay Kumar Nandam
2026-09-23 16:33 ` [PATCH v6 3/4] ASoC: dt-bindings: qcom,q6apm-dai: add memory-region and relax iommus Ajay Kumar Nandam
2026-09-28 10:50 ` Krzysztof Kozlowski [this message]
2026-09-23 16:33 ` [PATCH v6 4/4] ASoC: qcom: q6apm-dai: add SCM buffer assignment for mDSP platforms Ajay Kumar Nandam
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