drm/xe/huc: Don't re-auth HuC if it's already authenticated

On newer platforms the HuC survives reset and stays authenticated, so no
need to re-authenticate it.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_huc.c

@@ -83,6 +83,12 @@ int xe_huc_auth(struct xe_huc *huc)
 
 	xe_assert(xe, !xe_uc_fw_is_running(&huc->fw));
 
+	/* On newer platforms the HuC survives reset, so no need to re-auth */
+	if (xe_mmio_read32(gt, HUC_KERNEL_LOAD_INFO) & HUC_LOAD_SUCCESSFUL) {
+		xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_RUNNING);
+		return 0;
+	}
+
 	if (!xe_uc_fw_is_loaded(&huc->fw))
 		return -ENOEXEC;