drm/i915/mtl: MMIO range is now 4MB

Previously only dgfx platforms had a 4MB MMIO range, but starting with
MTL we now use the larger range for all platforms.

Bspec: 63834, 63830
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220818234202.451742-4-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/intel_uncore.c

@@ -2235,14 +2235,15 @@ int intel_uncore_setup_mmio(struct intel_uncore *uncore, phys_addr_t phys_addr)
 	 * clobbering the GTT which we want ioremap_wc instead. Fortunately,
 	 * the register BAR remains the same size for all the earlier
 	 * generations up to Ironlake.
-	 * For dgfx chips register range is expanded to 4MB.
+	 * For dgfx chips register range is expanded to 4MB, and this larger
+	 * range is also used for integrated gpus beginning with Meteor Lake.
 	 */
-	if (GRAPHICS_VER(i915) < 5)
-		mmio_size = 512 * 1024;
-	else if (IS_DGFX(i915))
+	if (IS_DGFX(i915) || GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
 		mmio_size = 4 * 1024 * 1024;
-	else
+	else if (GRAPHICS_VER(i915) >= 5)
 		mmio_size = 2 * 1024 * 1024;
+	else
+		mmio_size = 512 * 1024;
 
 	uncore->regs = ioremap(phys_addr, mmio_size);
 	if (uncore->regs == NULL) {