On Wed, Nov 11, 2020 at 08:38:14PM +0800, Yong Wu wrote:

This patch mainly adds support for mt8192 Multimedia IOMMU and SMI.

mt8192 also is MTK IOMMU gen2 which uses ARM Short-Descriptor translation
table format. The M4U-SMI HW diagram is as below:

                          EMI
                           |
                          M4U
                           |
                      ------------
                       SMI Common
                      ------------
                           |
  +-------+------+------+----------------------+-------+
  |       |      |      |       ......         |       |
  |       |      |      |                      |       |
larb0   larb1  larb2  larb4     ......      larb19   larb20
disp0   disp1   mdp    vdec                   IPE      IPE

All the connections are HW fixed, SW can NOT adjust it.

Comparing with the preview SoC, this patchset mainly adds two new functions:
a) add iova 34 bits support.
b) add multi domains support since several HW has the special iova
region requirement.

change note:
v4: a) rebase on v5.10-rc1
    b) Move the smi part to a independent patchset.
    c) Improve v7s code from Robin and Will.
    d) Add a mediatek iommu entry patch in MAINTAINERS.

Please can you post a v5 of this, adding the Acks from v4 and addressing
the build failures reported by the kbuild robot on patch 20?

Thanks,

Will

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