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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This was workaround for the users of gbm_bo_create_with_modifiers(),
which were unable to specify the buffer usage (GPU / GPU+DISPLAY).
But after the commit [1] this become possible. And forcing usage to
GBM_BO_USE_SCANOUT migrated directly into gbm_bo_create_with_modifiers(),
allowing us to remove such workarounds from the drivers [2].
This makes possible to allocate the buffers in VRAM using
gbm_bo_create_with_modifiers2 and gbm_bo_create and providing correct use
flag, saving CMA memory.
This should also enable tiling for such buffers.1: 268e12c6 ("gbm: add gbm_{bo,surface}_create_with_modifiers2")
2: ad50b47a ("gbm: assume USE_SCANOUT in create_with_modifiers")
This patch was extracted from !12402 (closed) with reworded message and proper justification.