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MT8192 contains an experimental Accelerator Coherency Port implementation, which does not work correctly but was unintentionally enabled by default. For correct operation of the GPU, we must set a chicken bit disabling ACP on MT8192. Adapted from the following downstream change to the out-of-tree, legacy Mali GPU driver: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2781271/5 Note this change is required for both Panfrost and the legacy kernel driver. Co-developed-by: Robin Murphy <[email protected]> Signed-off-by: Robin Murphy <[email protected]> Signed-off-by: Alyssa Rosenzweig <[email protected]> Cc: Nick Fan <[email protected]> Cc: Nicolas Boichat <[email protected]> Cc: Chen-Yu Tsai <[email protected]> Cc: Stephen Boyd <[email protected]> Cc: AngeloGioacchino Del Regno <[email protected]> Tested-by: AngeloGioacchino Del Regno <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Matthias Brugger <[email protected]>