linux-kernel - [PATCH v4 0/3] Add support for APPS SMMU on QCS615

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Message-ID: <20241105032107.9552-1-quic_qqzhou@quicinc.com>
Date: Tue, 5 Nov 2024 08:51:04 +0530
From: Qingqing Zhou <quic_qqzhou@...cinc.com>
To: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <robimarko@...il.com>,
        <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
        Qingqing Zhou
	<quic_qqzhou@...cinc.com>
Subject: [PATCH v4 0/3] Add support for APPS SMMU on QCS615

Enable APPS SMMU function on QCS615 platform. APPS SMMU is required
for address translation in devices including Ethernet/UFS/USB and
so on.

Add the SCM node for SMMU probing normally. SMMU driver probe will
check qcom_scm ready or not, without SCM node, SMMU driver probe will
defer.
The dmesg log without SCM node:
platform 15000000.iommu: deferred probe pending: arm-smmu: qcom_scm not ready

With the SCM node, SMMU can probe normally, but SCM driver still fails
to probe because of one SCM bug:
qcom_scm firmware:scm: error (____ptrval____): Failed to enable the TrustZone memory allocator
qcom_scm firmware:scm: probe with driver qcom_scm failed with error 4
The above SCM bug has been fixed and applied:
https://lore.kernel.org/all/172965696408.224417.2033308332604008573.b4-ty@kernel.org/#t
But above patch doesn't impact building of current patch series which
can build successfully without above patch.
The above patch is already applied so this SCM bug disappears now.

This patch series depends on below patch series:
https://lore.kernel.org/linux-arm-msm/20241022-add_initial_support_for_qcs615-v4-0-0a551c6dd342@quicinc.com/

Changes in v4:
- Mark "dma-coherent" for APPS SMMU node suggested by Konrad, QCS615
  APPS SMMU indeed supports IO-coherency.
- Add the Reviewed-by tag in the commit message of SCM node patch.
- Remove the SMMU bindings patch because it's already applied to will (for-joerg/
  arm-smmu/bindings) at https://git.kernel.org/will/c/515c8ff024ba
- Add "SCM bug fix is already applied" information in cover letter.
- Link to v3: https://lore.kernel.org/all/20241025030732.29743-1-quic_qqzhou@quicinc.com/

Changes in v3:
- Align the interrupts of the APPS SMMU node suggested by Konrad.
- Add the Acked-by tag in the commit message of SCM bindings patch.
- Update the dependency link, SCM bug fix link and base-commit in
  cover letter.
- Link to v2: https://lore.kernel.org/linux-arm-msm/20241015081603.30643-1-quic_qqzhou@quicinc.com/

Changes in v2:
- Add the compatible "qcom,qcs615-smmu-500" into no-clocks list for
  arm,smmu.yaml suggested by Krzysztof.
- Improve the commit messages and cover letter.
- Link to v1: https://lore.kernel.org/all/20241011063112.19087-1-quic_qqzhou@quicinc.com/

Qingqing Zhou (3):
  dt-bindings: firmware: qcom,scm: document QCS615 SCM
  arm64: dts: qcom: qcs615: add the SCM node
  arm64: dts: qcom: qcs615: add the APPS SMMU node

 .../bindings/firmware/qcom,scm.yaml           |  1 +
 arch/arm64/boot/dts/qcom/qcs615.dtsi          | 82 +++++++++++++++++++
 2 files changed, 83 insertions(+)


base-commit: 7436324ebd147598f940dde1335b7979dbccc339
prerequisite-patch-id: 3a76212d3a3e930d771312ff9349f87aee5c55d5
prerequisite-patch-id: 8a2454d5e07e56a6dd03f762f498051065635d85
prerequisite-patch-id: 46cdc5640598b60d2f5449af444d6d4e479c00b8
prerequisite-patch-id: 050d1dd8cc9397618e570e6de2d81d0c32c10d7a
prerequisite-patch-id: cd9fc0a399ab430e293764d0911a38109664ca91
prerequisite-patch-id: 07f2c7378c7bbd560f26b61785b6814270647f1b
prerequisite-patch-id: f9680e3c90d8f05babbcadd7b7f5174f484a8275
prerequisite-patch-id: f78398623b7f08ae1183a4e637045a081bc93ec8
prerequisite-patch-id: 54b4dd987711302b083f714c6f230726c7781042
prerequisite-patch-id: 624720e543d7857e46d3ee49b8cea413772deb4c
prerequisite-patch-id: 04ca722967256efddc402b7bab94136a5174b0b9
prerequisite-patch-id: ab88a42ec69ad90e8509c9c5b7c6bdd595a7f783
prerequisite-patch-id: 918724fafe43acaa4c4b980bfabe36e9c3212cd1
prerequisite-patch-id: 203a45a2f2a8c636ad88b6c0d4868721dc34633d
prerequisite-patch-id: fc1cfec4ecd56e669c161c4d2c3797fc0abff0ae
-- 
2.17.1