intel: disable GT1 (Media chip) on FreeBSD

This disables the GT1 unit on meteorlake and newer. This GT is in
charge of handling accelerated media and HDCP, which requires
the MEI driver. We don't have this on FreeBSD yet so disable it
for now to get mtl gpus working. We also have to disable the
HDCP initialization or else it will panic because the GT pointer
is invalid.

Author: amshafer

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

@@ -2279,6 +2279,15 @@ static int initialize_hdcp_port_data(struct intel_connector *connector,
 
 static bool is_hdcp2_supported(struct drm_i915_private *i915)
 {
+#ifdef __FreeBSD__
+	/*
+	 * HDCP is not supported on meteorlake because it requires
+	 * GSC which depends on the MEI driver, which we do not have.
+	 */
+	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
+		return false;
+#endif
+
 	if (intel_hdcp_gsc_cs_required(i915))
 		return true;
 

drivers/gpu/drm/i915/gt/intel_sa_media.c

@@ -14,6 +14,18 @@ int intel_sa_mediagt_setup(struct intel_gt *gt, phys_addr_t phys_addr,
 {
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_uncore *uncore;
+#ifdef __FreeBSD__
+	/*
+	 * Skip standalone media GT on Meteor Lake.
+	 * FreeBSD lacks MEI driver support needed for GSC proxy,
+	 * which causes GuC authentication to fail on GT1.
+	 */
+	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP)) {
+		drm_info(&i915->drm,
+				"Skipping GT1 (Standalone Media GT) - MEI driver not available on FreeBSD\n");
+		return 0;
+	}
+#endif
 
 	uncore = drmm_kzalloc(&i915->drm, sizeof(*uncore), GFP_KERNEL);
 	if (!uncore)