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There are a bunch of places in the driver where we need to perform non-GT MMIO against the platform's primary tile (display code, top-level interrupt enable/disable, driver initialization, etc.). Rename 'to_gt()' to 'xe_primary_mmio_gt()' to clarify that we're trying to get a primary MMIO handle for these top-level operations. In the future we need to move away from xe_gt as the target for MMIO operations (most of which are completely unrelated to GT). v2: - s/xe_primary_mmio_gt/xe_root_mmio_gt/ for more consistency with how we refer to tile 0. (Lucas) v3: - Tweak comment on xe_root_mmio_gt(). (Lucas) Acked-by: Nirmoy Das <nirmoy.das@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Link: https://lore.kernel.org/r/20230601215244.678611-16-matthew.d.roper@intel.com Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>