drm/i915: Use graphics ver, rel info for media on old platforms

Platforms prior to MTL do not have a separate media and graphics version.
On platforms where GMD id is not supported, reuse the graphics ip version,
release info for media.

The rest of the IP graphics, display versions would be copied during driver
creation.

While at it warn if GMD is not used for platforms greater than gen12.

v2:
 - Use simple assignment to copy contents of the structure(JaniN)

Fixes: c2c70752 ("drm/i915: Read graphics/media/display arch version from hw")
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221011153851.3781507-2-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/intel_device_info.c

@@ -329,8 +329,16 @@ static void intel_ipver_early_init(struct drm_i915_private *i915)
 {
 	struct intel_runtime_info *runtime = RUNTIME_INFO(i915);
 
-	if (!HAS_GMD_ID(i915))
+	if (!HAS_GMD_ID(i915)) {
+		drm_WARN_ON(&i915->drm, RUNTIME_INFO(i915)->graphics.ip.ver > 12);
+		/*
+		 * On older platforms, graphics and media share the same ip
+		 * version and release.
+		 */
+		RUNTIME_INFO(i915)->media.ip =
+			RUNTIME_INFO(i915)->graphics.ip;
 		return;
+	}
 
 	ip_ver_read(i915, i915_mmio_reg_offset(GMD_ID_GRAPHICS),
 		    &runtime->graphics.ip);