drm/i915: Lookup the memory region first in the BIOS FB takeover

When doing the BIOS FB takeover let's look up the appropriate
memory region first. If it doesn't exist there's not much point
in doing the PTE read/etc either.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313140838.29742-9-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

drivers/gpu/drm/i915/display/intel_plane_initial.c

@@ -75,6 +75,15 @@ initial_plane_phys_lmem(struct intel_display *display,
 	dma_addr_t dma_addr;
 	u32 base;
 
+	mem_type = initial_plane_memory_type(i915);
+	mem = intel_memory_region_by_type(i915, mem_type);
+	if (!mem) {
+		drm_dbg_kms(display->drm,
+			    "Initial plane memory region (type %s) not initialized\n",
+			    intel_memory_type_str(mem_type));
+		return false;
+	}
+
 	base = round_down(plane_config->base, I915_GTT_MIN_ALIGNMENT);
 
 	dma_addr = intel_ggtt_read_entry(&ggtt->vm, base, &is_present, &is_local);
@@ -91,15 +100,6 @@ initial_plane_phys_lmem(struct intel_display *display,
 		return false;
 	}
 
-	mem_type = initial_plane_memory_type(i915);
-	mem = intel_memory_region_by_type(i915, mem_type);
-	if (!mem) {
-		drm_dbg_kms(display->drm,
-			    "Initial plane memory region (type %s) not initialized\n",
-			    intel_memory_type_str(mem_type));
-		return false;
-	}
-
 	/*
 	 * On lmem we don't currently expect this to
 	 * ever be placed in the stolen portion.
@@ -133,6 +133,15 @@ initial_plane_phys_smem(struct intel_display *display,
 	dma_addr_t dma_addr;
 	u32 base;
 
+	mem_type = initial_plane_memory_type(i915);
+	mem = intel_memory_region_by_type(i915, mem_type);
+	if (!mem) {
+		drm_dbg_kms(display->drm,
+			    "Initial plane memory region (type %s) not initialized\n",
+			    intel_memory_type_str(mem_type));
+		return false;
+	}
+
 	base = round_down(plane_config->base, I915_GTT_MIN_ALIGNMENT);
 
 	dma_addr = intel_ggtt_read_entry(&ggtt->vm, base, &is_present, &is_local);
@@ -149,15 +158,6 @@ initial_plane_phys_smem(struct intel_display *display,
 		return false;
 	}
 
-	mem_type = initial_plane_memory_type(i915);
-	mem = intel_memory_region_by_type(i915, mem_type);
-	if (!mem) {
-		drm_dbg_kms(display->drm,
-			    "Initial plane memory region (type %s) not initialized\n",
-			    intel_memory_type_str(mem_type));
-		return false;
-	}
-
 	if (dma_addr < mem->region.start || dma_addr > mem->region.end) {
 		drm_err(display->drm,
 			"Initial plane programming using invalid range, dma_addr=%pa (%s [%pa-%pa])\n",