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Add an API to take a snapshot of DPU controller registers. This API will be used by the msm_disp_snapshot module to capture the DPU snapshot. Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/1618606645-19695-6-git-send-email-abhinavk@codeaurora.org Signed-off-by: Rob Clark <robdclark@chromium.org>