[PATCH v3 00/11] Adjust the dma-ranges for MTK IOMMU

[Yong Wu]

After commit f1ad5338a4d5 ("of: Fix "dma-ranges" handling for bus
controllers"), the dma-ranges is not allowed for dts leaf node.
but we still would like to separate the different masters into
different iova regions. Thus we adjust the internal flow, separate
the 16GB iova range by the master HW larbid/portid and add the
dma-ranges property in the parent "soc" node. This also could avoid
the users forget/abuse the iova regions.

The commit f1ad5338a4d5 did affect the mt8195 venc, But it is not
a fatal issue, it could also work well at 0-4GB iova. thus I don't
add "Fixes:" tag.

In this series, I add functions for mt8192/mt8195/mt8186, mt8188 will
be in its special patchset. and the previous mt8173/mt8183...support
0-4GB only, no need this function.

Change note:
v3: Add a new patch only for comment more in the code.

v2: https://lore.kernel.org/linux-mediatek/20230208053643.28249-1-yong.wu@xxxxxxxxxxxx/
   a) Base on next-20230206 since mt8195 jpeg node is applied which affect
      this patch.
   b) Reword the commit message [1/10][2/10] to explain effect.

v1: https://lore.kernel.org/linux-mediatek/20230113060133.9394-1-yong.wu@xxxxxxxxxxxx/
   Base on v6.2-rc3.

Yong Wu (11):
  dt-bindings: media: mediatek,vcodec: Remove dma-ranges property
  dt-bindings: media: mediatek,jpeg: Remove dma-ranges property
  iommu/mediatek: Improve comment for the current region/bank
  iommu/mediatek: Get regionid from larb/port id
  iommu/mediatek: mt8195: Add iova_region_larb_msk
  iommu/mediatek: mt8186: Add iova_region_larb_msk
  iommu/mediatek: mt8192: Add iova_region_larb_msk
  iommu/mediatek: Add a gap for the iova regions
  arm64: dts: mt8195: Add dma-ranges for the parent "soc" node
  arm64: dts: mt8195: Remove the unnecessary dma-ranges
  arm64: dts: mt8186: Add dma-ranges for the parent "soc" node

 .../media/mediatek,mt8195-jpegdec.yaml        |   7 -
 .../media/mediatek,mt8195-jpegenc.yaml        |   7 -
 .../media/mediatek,vcodec-decoder.yaml        |   5 -
 .../media/mediatek,vcodec-encoder.yaml        |   5 -
 .../media/mediatek,vcodec-subdev-decoder.yaml |   7 -
 .../bindings/media/mediatek-jpeg-encoder.yaml |   5 -
 arch/arm64/boot/dts/mediatek/mt8186.dtsi      |   1 +
 arch/arm64/boot/dts/mediatek/mt8195.dtsi      |   4 +-
 drivers/iommu/mtk_iommu.c                     | 137 ++++++++++++++----
 9 files changed, 108 insertions(+), 70 deletions(-)

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2.18.0