linux-kernel - Re: [RFC PATCH 0/8] Add mt8196 SMMU support

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Message-ID: <b32f4afd-5683-4eec-8da7-a21a9a4950c1@collabora.com>
Date: Thu, 18 Sep 2025 13:37:34 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Xueqi Zhang <xueqi.zhang@...iatek.com>, Yong Wu <yong.wu@...iatek.com>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Joerg Roedel <joro@...tes.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>
Cc: Project_Global_Chrome_Upstream_Group@...iatek.com,
 Ning li <ning.li@...iatek.com>, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, iommu@...ts.linux.dev
Subject: Re: [RFC PATCH 0/8] Add mt8196 SMMU support

Il 16/06/25 04:56, Xueqi Zhang ha scritto:
> This patchset add mt8196 SMMU support.
> 1. Mediatek SMMU interrupt is low level active rather than the
> standard edge. Process Mediatek SMMU wrapper interrupt and dump
> detailed information when a translation fault occurs.
> 2. In some projects, Mediatek also have EL2 driver, so put the pm
> operation in TFA(EL3), then all the kernel and EL2 could control
> the pm. Thus implement rpm get/put function which send smc call to
> TFA to get/put SMMU power.
> 
> Xueqi Zhang (8):
>    dt-bindings: iommu: mediatek: Add mt8196 support
>    iommu/arm-smmu-v3: Add SMMU implementation
>    iommu/arm-smmu-v3: Add implementation for MT8196 MM SMMU
>    iommu/arm-smmu-v3: Add implementation for MT8196 APU SMMU
>    iommu/arm-smmu-v3: Add IRQ handle for smmu impl
>    iommu/arm-smmu-v3: mediatek: Add wrapper handle for IRQ
>    iommu/arm-smmu-v3: Invoke rpm operation before accessing the hw
>    iommu/arm-smmu-v3: mediatek: Implement rpm get/put function
> 
>   .../bindings/iommu/arm,smmu-v3.yaml           |  24 +-
>   drivers/iommu/arm/Kconfig                     |   7 +
>   drivers/iommu/arm/arm-smmu-v3/Makefile        |   3 +-
>   .../iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c  |  16 +
>   .../arm/arm-smmu-v3/arm-smmu-v3-mediatek.c    | 536 ++++++++++++++++++
>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  96 +++-
>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  14 +
>   7 files changed, 691 insertions(+), 5 deletions(-)
>   create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c
>   create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-mediatek.c
> 

Xueqi, any followup on this series?

All of the multimedia blocks (including display) become unusable without an IOMMU
on MT8196, MT6991 and newer.

Regards,
Angelo