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    SubjectRe: [PATCH V2 5/5] DO NOT MERGE: iommu: disable list appending in dma-iommu
    On Thu, Sep 03, 2020 at 09:18:37PM +0100, Tom Murphy wrote:
    > Disable combining sg segments in the dma-iommu api.
    > Combining the sg segments exposes a bug in the intel i915 driver which
    > causes visual artifacts and the screen to freeze. This is most likely
    > because of how the i915 handles the returned list. It probably doesn't
    > respect the returned value specifying the number of elements in the list
    > and instead depends on the previous behaviour of the intel iommu driver
    > which would return the same number of elements in the output list as in
    > the input list.

    So what is the state of addressing this properly in i915? IF we can't
    get it done ASAP I wonder if we need a runtime quirk to disable
    merging instead of blocking this conversion..

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