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This reverts commit bc9241be.

Commit c1ec54b7


("drm/mediatek: Use mailbox rx_callback instead of cmdq_task_cb")
would cause numerous mtk cmdq mailbox driver warning:

WARNING: CPU: 0 PID: 0 at drivers/mailbox/mtk-cmdq-mailbox.c:198
cmdq_task_exec_done+0xb8/0xe0

So revert that patch and all the patches depend on that patch.
Reported-by: Enric Balletbo Serra <eballetbo@gmail.com>
Tested-by: Enric Balletbo Serra <eballetbo@gmail.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>