drm/i915: Define MCR registers explicitly
Rather than using the same _MMIO() macro to define MCR registers as singleton registers, let's use a new MCR_REG() macro to make it clear that these registers are special and should be handled accordingly. For now MCR_REG() will still generate an i915_reg_t with the given offset, but we'll change that in future patches. Bspec: 66673, 66696, 66534, 67609 Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221014230239.1023689-9-matthew.d.roper@intel.com
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