drm/amdgpu/display: handle gfx12 in amdgpu_dm_plane_format_mod_supported

All this code has undefined behavior on GFX12 and shouldn't be executed.
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c

@@ -1419,8 +1419,6 @@ static bool amdgpu_dm_plane_format_mod_supported(struct drm_plane *plane,
 	const struct drm_format_info *info = drm_format_info(format);
 	int i;
 
-	enum dm_micro_swizzle microtile = amdgpu_dm_plane_modifier_gfx9_swizzle_mode(modifier) & 3;
-
 	if (!info)
 		return false;
 
@@ -1442,6 +1440,10 @@ static bool amdgpu_dm_plane_format_mod_supported(struct drm_plane *plane,
 	if (i == plane->modifier_count)
 		return false;
 
+	/* GFX12 doesn't have these limitations. */
+	if (AMD_FMT_MOD_GET(TILE_VERSION, modifier) <= AMD_FMT_MOD_TILE_VER_GFX11) {
+		enum dm_micro_swizzle microtile = amdgpu_dm_plane_modifier_gfx9_swizzle_mode(modifier) & 3;
+
 		/*
 		 * For D swizzle the canonical modifier depends on the bpp, so check
 		 * it here.
@@ -1466,6 +1468,7 @@ static bool amdgpu_dm_plane_format_mod_supported(struct drm_plane *plane,
 			if (info->num_planes > 1)
 				return false;
 		}
+	}
 
 	return true;
 }