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Only domain root packages can enumerate System (Psys) domain. Whether a package is domain root or not is described in the Bit 0 of the Domain Info register. Add support for Domain Info register and fix the System domain probing accordingly. Fixes: 9eef7f9da928 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver") Signed-off-by: Zhang Rui <rui.zhang@intel.com> Cc: 6.5+ <stable@vger.kernel.org> # 6.5+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>